Objective To explore the effect of moxibustion at ＂Shénquè＂（神阙 CV 8） on the immune system of rats taking long-term exhaustive exercise.Method Thirty male SD rats were randomly divided into blank group,...Objective To explore the effect of moxibustion at ＂Shénquè＂（神阙 CV 8） on the immune system of rats taking long-term exhaustive exercise.Method Thirty male SD rats were randomly divided into blank group,model group and moxibustion group with 10 rats in each group.Except the rats in blank group,all the rats were established into long-term exhaustive models through swimming again and again.Mild moxibustion at CV 8 for 15 min was carried out in the rats in moxibustion group after modeling.The treatment was conducted once every other day,and treatment for 10 times was needed.The exhaustive duration for each time was recorded,the levels of serum Ig A,Ig G,Ig M and ACP were detected 24 h after the 10 th exhaustive exercise,and the histomorphological changes of spleen were observed.Immunoturbidimetry was adopted for detecting the Ig A level,and ELISA method was used for detecting the levels of Ig G,Ig M and ACP.Results The common exhaustive duration in moxibustion group was longer than that in model group,however,the time difference was statistically significant after the 5th exhaustive exercise（P0.01）.The levels of serum IgG and IgM in model group were lower than that in blank group（all P0.01）,and the serum ACP level in model group was higher than that in blank group（P0.01）,indicating that the splenic histomorphology was damaged.The levels of serum Ig G and Ig M in moxibustion group were higher than that in model group（all P0.01）,and the serum ACP level in moxibustion group was lower than that in model group,showing that the splenic histomorphology was repaired.Conclusion Moxibustion at CV 8 can improve the levels of immunoglobulin（Ig G,Ig A,Ig M） of tired body for a long time,decrease the ACP level,and repair the damaged spleen tissues.展开更多
Objective To explore the effect of moxibustion at Shenque （神阙 CV 8） on the anti-exercise-induced fatigue in rats after exhaustive exercise in varying degrees. Methods Seventy-two SD rats were randomly divided int...Objective To explore the effect of moxibustion at Shenque （神阙 CV 8） on the anti-exercise-induced fatigue in rats after exhaustive exercise in varying degrees. Methods Seventy-two SD rats were randomly divided into 3 groups according to the random number table method, including blank group, model group and moxibustion group. The model group and moxibustion group were divided into 4 subgroups respectively, that was 1 time, 4 times, 7 times and 10 times subgroup. There were 9 groups with 8 rats in each group. Except blank group, all the rats were established into exhaustive models through swimming. Mild moxibustion at CV 8 was carried out for 15 min in the rats in moxibustion group after modeling for once every other day. The concentration of serum glucose （GLU）, malonaldehyde （MDA） and blood urea nitrogen （BUN） as well as the activity of aspartate transaminase （AST）, alanine transaminase （ALT） and lactic dehydrogenase （LDH） were detected 24h after the exhaustive exercise by adopting full-automatic analyzer. Results The exhaustive time of rats were long at first but shorter later. The exhaustive time of rats in the model group （4 times） were obviously longer than that in the model group （1 time） （P〈0.01）, the exhaustive time of rats in the model group （7 times） and model group （10 times） were obviously shorter than that in the model group （1 time） （P〈0.01）, and the exhaustive time of rats in the moxibustion group （7 times） and moxibustion group （10 times） were obviously longer than that in the model group with the same number of times （P〈0.01）, the serum GLU level of rats in the model group （7 times） and model group （10 times） increased when compared with the blank group （P〈0.01）, and the serum MDA and BNU levels as well as the activity of AST, ALT and LDH of rats in the model group （4 times）, model group （7 times） and model group （10 times） increased when compared with the blank group （P〈0.05 or P〈0.01）, the serum GLU, MDA and BNU levels as well as the activity of AST and ALT of rats in the moxibustion group （7 times） and moxibustion group （10 times） reduced when compared with the model group with the same number of times （P〈0.05 or P〈0.01）, and the serum LDH activity of rats in the moxibustion group （4 times）, moxibustion group （7 times） and moxibustion group （10 times） reduced when compared with the model group with the same number of times （P〈0.05 or P〈0.01）. Conclusion Moxibustion at CV 8 can reduce the serum MDA and BNU levels as well as the activity of AST, ALT and LDH of organism in a status of long-term fatigue, effectively improve the symptom of long-term fatigue, providing a certain experimental basis for the clinical application of moxibustion at CV 8 in the process of anti-exercise-induced fatigue in the future.展开更多
Objective: To investigate the expression of myocardium connexin 43(Cx43) in late exercise preconditioning(LEP) cardioprotection. Methods: Eight-week-old adult male Sprague Dawley rats were randomly assigned into four ...Objective: To investigate the expression of myocardium connexin 43(Cx43) in late exercise preconditioning(LEP) cardioprotection. Methods: Eight-week-old adult male Sprague Dawley rats were randomly assigned into four groups(n=8). Myocardial injury was judged in accordance with serum levels of c Tn and NT-pro BNP as well as hematoxylin basicfuchsin picric acid staining of myocardium. Cx43 m RNA was detected by in situ hybridization and qualified by real-time fluorescence quantitative PCR. Cx43 protein was localized by immunohistochemistry and its expression level was determined by western blotting. Results: The LEP obviously attenuated the myocardial ischemia/hypoxia injury caused by exhaustive exercise. There was no significant difference of Cx43 m RNA level between the four groups. Cx43 protein level was decreased significantly in group EE(P<0.05). However, LEP produced a significant increase in Cx43 protein level(P<0.05), and the decreased Cx43 protein level in exhaustive exercise was significantly up-regulated by LEP(P<0.05). Conclusions: LEP protects rat heart against exhaustive exercise-induced myocardial injury by up-regulating the expression of myocardial Cx43.展开更多
Orthogonal frequency division multiplexing(OFDM) is an attractive technology to provide immense improvement in wireless transmission capacity but high peak-to-average power ratio(PAPR) is a major drawback of OFDM syst...Orthogonal frequency division multiplexing(OFDM) is an attractive technology to provide immense improvement in wireless transmission capacity but high peak-to-average power ratio(PAPR) is a major drawback of OFDM system.Selected mapping(SLM) scheme has good performance for PAPR reduction.It requires the transmitting data to be multiplied by random phase sequences.However,the sequences are pseudo-random which will decrease the method effectiveness.Exhaustive entropy is introduced in this paper which can identify the strength of random phase sequences property.Then an exhaustive entropy based on SLM method is proposed.The scheme improves the effectiveness of random phase sequences by selecting the larger exhaustive entropy of them.The simulation results show that the PAPR reduction performance is better than that of conventional SLM through this method.展开更多
BACKGROUND： Exhaustive exercise can lead to apoptosis of skeletal muscle cells and myocardial cells as a result of pathological changes in the corresponding cellular ultrastructure. It is hypothesized that such chang...BACKGROUND： Exhaustive exercise can lead to apoptosis of skeletal muscle cells and myocardial cells as a result of pathological changes in the corresponding cellular ultrastructure. It is hypothesized that such changes could also occur in neurons. OBJECTIVE： To observe brain cell apoptosis and ultrastructural changes in hippocampal neurons in rats following endurance training and acute exhaustive exercise. DESIGN, TIME AND SETTING： A randomized, controlled, morphological analysis was performed at the Medical Laboratory Center of Zhengzhou University between July and November 2007. MATERIALS： Forty male, 8-week-old, Sprague Dawley rats were included in this study. METHODS： Endurance training consisted of treadmill running once a day, 6 days a week, for 4. weeks. For acute exhaustive exercise, graded treadmill running was conducted. Rats were exposed to exercise at an increasing speed （10 m/min, increasing to 20 and 36 m/min for moderate- and high-intensity exhaustive exercise, respectively, and then was continued until exhaustion）. A total of 40 rats were evenly distributed into the following 4. groups： Group A rats were not exercised; Group B rats were not trained but sacrificed 24 hours after acute exhaustive treadmill running exercise; Group C-rats were subjected to endurance training and sacrificed immediately after acute exhaustive treadmill running exercise; Group D rats were subjected to endurance training and sacrificed 24 hours after acute exhaustive treadmill running exercise. MAIN OUTCOME MEASURES： Apoptotic cell death was detected by the TUNEL method and hippocampal neuronal ultrastructural change was observed through using transmission electron microscopy. RESULTS： All 40 rats were included in the final analysis. Subsequent to exhaustive exercise, rat cerebral cortex and hippocampal neurons appeared contracted and degenerated. In addition, high amount of lipofuscin was visible in the hippocampal region, Necrotic neurons encased by glial cells appeared in the cerebral cortex and hippocampus. Glial cells exhibited different degrees of swelling. Subsequent to exhaustive exercise, brain cell apoptosis rate significantly increased, and reached over 30% in some regions, compared with group A （P 〈 0.05）. No significant difference in apoptosis rate existed between groups B, C, and D （P 〈 0.05）. CONCLUSION： Endurance training and acute exhaustive exercise cause, to some degree, injuries to glial cells, resulting in apoptosis of numerous brain cells. Subsequent to exhaustive exercise, high amounts of lipofuscin appear in the hippocampus, indicating that exhaustive exercise possibly contributes to neural cell aging or dysmetabolism.展开更多
Rabies is one of the most dangerous and widespread zoonosis and is characterized by severe neurological signs and a high case-mortality rate of nearly 100%. Vaccination is the most effective way to prevent rabies in h...Rabies is one of the most dangerous and widespread zoonosis and is characterized by severe neurological signs and a high case-mortality rate of nearly 100%. Vaccination is the most effective way to prevent rabies in humans and animals. In this study, the relationship between exhaustive exercise and the humoral immune response after immunization with inactivated rabies vaccine was investigated in a mouse model with one-time exhaustive exercise. It was found that compared with the mice with no exercise after vaccination, no significant differences were found in those with exhaustive exercise after vaccination on body-weight changes, virus-neutralizing antibody(VNA) titers, antibody subtypes and survivor ratio after lethal rabies virus(RABV) challenge. This study indicated that exhaustive exercise does not reduce the effects of the rabies inactivated vaccine.展开更多
A sensitive method for the determination of ephedrine and codeine in human urine by capillary electrophoresis （CE） was described. In order to improve the sensitivity, two online concentration techniques including ca...A sensitive method for the determination of ephedrine and codeine in human urine by capillary electrophoresis （CE） was described. In order to improve the sensitivity, two online concentration techniques including cation-selective exhaustive injection （CSEI） and sweeping micellar electrokinetic chromatography （sweeping-MEKC） were used. Under the optimum conditions, the detection limits （S/N = 3） were 0.10 μg/L for ephedrine and 0.80 μg/L for codeine. This method was successfully applied to real urine sample analysis.展开更多
Objective:To clarify the effect of endurance training on the expression profile of circRNA-lncRNA-miRNA-mRNA in myocardial tissues of mice after exhaustive exercise.Methods:A total of 45 male C57BL/6 mice were randoml...Objective:To clarify the effect of endurance training on the expression profile of circRNA-lncRNA-miRNA-mRNA in myocardial tissues of mice after exhaustive exercise.Methods:A total of 45 male C57BL/6 mice were randomly divided into control(C),low-strength endurance training(LSET)and high-strength endurance training(HSET)groups(n=15).The mice in the control group were not conducted to platform training.The mice in the LSET and HSET groups were conducted to platform training at 30%and 60%of exhaustive exercise once a day for 5 days a week,respectively.The exhaustion exercise was performed after 5 weeks of platform training.Total RNA was extracted from myocardial tissues,and the expression profile of circRNA-lncRNA-miRNA-mRNA in myocardial tissues was analyzed using Illimina transcriptome sequencing.Results:The distance and time of exhaustive exercise were longer in the LSET and HSET groups than in the control group,and the distance and time of exhaustive exercise were longer in the HSET group than in the LSET group(P<0.05).A total of 54 differentially expressed circRNAs(28 down-regulated and 26 up-regulated),7 differentially expressed lncRNAs(all down-regulated),3 differentially expressed miRNAs(1 down-regulated and 2 up-regulated)and 99 differentially expressed mRNAs(81 down-regulated and 18 up-regulated)were identified by transcriptome sequencing(P<0.05).Interaction network analysis revealed that ENSMUSG00000113041,MSTRG.79740,mmu-miR-374c-5p,18 down-regulated mRNAs and 3 up-regulated mRNAs formed a regulatory network.GO functional analysis revealed that the differentially expressed mRNAs were mainly enriched in primary metabolic processes and macromolecular synthesis and metabolic processes.KEGG pathway analysis revealed that the differentially expressed mRNAs were mainly enriched in complement and coagulation cascade pathways,estrogen signaling pathway and glucagon signaling pathway.Conclusion:Endurance training could alter the expression profile of circRNA-lncRNA-miRNA-mRNA in myocardial tissues of mice after exhaustive exercise,and these differentially expressed RNAs form a regulatory network that affects cardiomyocyte synthesis and metabolism and thus participates in the regulation of myocardial injury.展开更多
In this paper,we identify the distinction between non-brute-force computation and brute-force computation as the most fundamental problem in computer science.Subsequently,we prove,by the diagonalization method,that co...In this paper,we identify the distinction between non-brute-force computation and brute-force computation as the most fundamental problem in computer science.Subsequently,we prove,by the diagonalization method,that constructed self-referential CSPs cannot be solved by nonbrute-force computation,which is stronger than P≠NP.This constructive method for proving impossibility results is very different(and missing)from existing approaches in computational complexity theory,but aligns with Gödel’s technique for proving logical impossibility.Just as Gödel showed that proving formal unprovability is feasible in mathematics,our results show that proving computational hardness is not hard in mathematics.Specifically,proving lower bounds for many problems,such as 3-SAT,can be challenging because these problems have various effective strategies available to avoid exhaustive search.However,for self-referential examples that are extremely hard,exhaustive search becomes unavoidable,making its necessity easier to prove.Consequently,it renders the separation between non-brute-force computation and brute-force computation much simpler than that between P and NP.Finally,our results are akin to Gödel’s incompleteness theorem,as they reveal the limits of reasoning and highlight the intrinsic distinction between syntax and semantics.展开更多
Objective： To investigate the effect of moxibustion at Shenque （CV 8） on free radical metabolism in rat＇s hippocampus after different degrees of exhaustive exercise. Methods： A total of 72 male Sprague-Dawley （S...Objective： To investigate the effect of moxibustion at Shenque （CV 8） on free radical metabolism in rat＇s hippocampus after different degrees of exhaustive exercise. Methods： A total of 72 male Sprague-Dawley （SD） rats were randomly divided into a normal group （n=8）, a model group （n=32） and a moxibustion group （n=32）. According to the times of modeling or treatment, the model group was further randomly divided into different subgroups of a 1-time model subgroup, a 4-time model subgroup, a 7-time model subgroup and a 10-time model subgroup （n=8）; the moxibustion group was also further randomly divided into different subgroups of a 1-time moxibustion subgroup, a 4-time moxibustion subgroup, a 7-time moxibustion subgroup and a 10-time moxibustion subgroup （n=8）. Rats in both model and moxibustion subgroups were subjected to establishing the swimming exhaustive model. Rats in each moxibustion subgroup received mild moxibustion at Shenque （CV 8） for 15 min immediately after modeling, once every other day. The concentration of malic dialdehyde （MDA）, as well as the activities of superoxide dismutase （SOD）, glutathione peroxidase （GSH-Px） and total antioxidant capacity （T-AOC） in rat＇s hippocampus in each group were detected 24 h after the exhaustive exercise. Results： Compared with the 1-time model subgroup, the exhaustive swimming time of rats was significantly prolonged in the 4-time model subgroup （P〈0.01）, while it was significantly shortened in the 7-time and 10-time model subgroups （both P〈0.01）. Compared with the matched model subgroup, the exhaustive swimming time of rats in the 7-time and 10-time moxibustion subgroups was significantly prolonged （both P〈0.01）. Compared with the normal group, the MDA concentration was increased significantly （P〈0.01）, and the activities stress response of SOD and T-AOC were increased in the 1-time model subgroup （both P〈0.05）; the MDA concentration was increased （all P〈0.01）, and the activities of SOD, GSH-Px and T-AOC were decreased differently （P〈0.05 or P〈0.01） in the 4-time, 7-time and 10-time model subgroups. Compared with the matched model subgroup, the concentration of MDA was significantly reduced （P〈0.05 or P〈0.01）, and the activities of SOD, GSH-Px and T-AOC were significantly increased in the 4-time, 7-time and 10-time moxibustion subgroups （all P〈0.01）. Conclusion： Moxibustion at Shenque （CV 8） can improve the fatigue status of the body after long-term exhaustive exercise by regulating free radical metabolism in rat＇s hippocampus. To some extent, this provides an experimental basis for moxibustion at Shenque （CV 8） against exercise-induced fatigue.展开更多
Background Little is known about the value of 31P-magnetic resonance spectroscopy （31P-MRS） in in vivo assessment of exhaustive exercise-induced injury in skeletal muscle.We aimed to evaluate the value of a 31P-MRS ...Background Little is known about the value of 31P-magnetic resonance spectroscopy （31P-MRS） in in vivo assessment of exhaustive exercise-induced injury in skeletal muscle.We aimed to evaluate the value of a 31P-MRS study using the quadriceps femoris after a single bout of acute exhaustive swimming in rats,and the correlation between 31P-MRS and histological changes.Methods Sixty male Sprague-Dawley rats were randomly assigned to control,half-exhaustive,and exhaustive exercise groups.31P-MRS of the quadriceps femoris of the right lower limb was performed immediately after swimming exercise to detect Pi,PCr,and β-ATP.The Pi/PCr,Pi/β-ATP,PCr/β-ATP,and PCr/（PCr＋Pi） were calculated and pH measured.Areas under the receiver operating characteristic curve （AUCs） were calculated to evaluate the diagnostic potential of 31P-MRS in identifying and distinguishing the three groups.HE staining,electron microscopy and desmin immunostaining after imaging of the muscle were used as a reference standard.The correlation between 31P-MRS and the mean absorbance （A value） of desmin staining were analyzed with the Pearson correlation test.Results Pi,PCr,Pi/PCr,and PCr/（PCr＋Pi） showed statistically significant intergroup differences （P＜0.05）.AUCs of Pi,PCr,Pi/PCr,and PCr/（PCr＋Pi） were 0.905,0.848,0.930,and 0.930 for the control and half-exhaustive groups,while sensitivity and specificity were 90％/85％,95％/55％,95％/80％,and 90％/85％,respectively.The AUCs of Pi,PCr,Pi/PCr and PCr/（PCr＋Pi） were 0.995,0.980,1.000,and 1.000 for the control and exhaustive groups,while sensitivity and specificity were 95％/90％,100％/90％,100％/95％,and 100％/95％,respectively.The AUCs of Pi,PCr,Pi/PCr,and PCr/（PCr＋Pi） were 0.735,0.865,0.903,and 0.903 for the half-exhaustive and exhaustive groups,while sensitivity and specificity were 80％/60％,90％/75％,95％/65％,and 95％/70％,respectively.In the half-exhaustive group,some muscle fibers exhibited edema in HE staining,and the unclear Z-discs and the mitochondria with vacuolar degeneration under electron microscopy.Compared with the half-exhaustive group,muscle fiber edema was increased in the exhaustive group,and the Z-discs were broken and the mitochondria exhibited marked vacuolar degeneration under electron microscopy.There were significant difference in A values of desmin staining in the right vastus lateralis among the control,half-exhaustive,and exhaustive groups with 0.58±0.06,0.30±0.04,and 0.21±0.02,respectively （P＜0.05）.Histological examination also showed injury-induced changes in the vastus lateralis among the different intensities groups.Statistically a moderate correlation between 31P-MRS and desmin was observed,the correlation coefficients of Pi,PCr,Pi/PCr,and PCr/（PCr＋Pi） were-0.706,0.709,-0.726,and 0.791,respectively （P＜0.01）.Conclusions 31P-MRS can effectively reflect the changes in energy metabolism in the skeletal muscle after a single bout of acute exhaustive swimming in rats.Based on the significant correlation between 31P-MRS parameters and histological changes,the changes of Pi,PCr,Pi/PCr,and PCr/（PCr＋Pi） can indirectly reflect the degree of exercise-induced injury.展开更多
Objective: To investigate the effect of moxibustion at Shenque (CV8) on the immune system in rats with different levels of exhaustive exercise. Methods: Fifty-six male Sprague-Dawley (SD) rats were randomly divided in...Objective: To investigate the effect of moxibustion at Shenque (CV8) on the immune system in rats with different levels of exhaustive exercise. Methods: Fifty-six male Sprague-Dawley (SD) rats were randomly divided into a blank group (n=8), an exhaustive group (n=24), and a moxibustion group (n=24). The exhaustive group was randomly divided into a 1-time exhaustive group, a 4-time exhaustive group and a 7-time exhaustive group, with 8 rats in each group. According to the treatment time, the moxibustion group was randomly divided into a 1-time moxibustion group, a 4-time moxibustion group and a 7-time moxibustion group, with 8 rats in each group. Rats in the exhaustive groups and the moxibustion groups were subjected to replicating the exhaustive swimming models. Rats in each moxibustion group received mild moxibustion for 15 min immediately after the exhaustive modeling, once every other day. Twenty-four hours after the corresponding exhaustive exercise, the rats in each group were tested for the levels of serum immunoglobulin (Ig) G, IgA, IgM and acid phosphatase (ACP), and the morphological changes of spleen tissues were observed. The level of IgA was detected by immunoturbidimetric assay, and the levels of IgG, IgM and ACP were detected by en zyme-linked imm uno sorb ent assay (ELISA). Results: Compared with the 1-time exhaustive group, swimming time of rats in the 4-time exhaustive group was significantly proIonged (P<0.01), and swimming time of rats in the 7-time exhaustive group was significantly shortened (P<0.01). Compared with the 7-time exhaustive group, exhaustive swimming time of rats in the 7-time moxibustion group was significantly proIonged (P<0.01). Compared with the blank group, the IgG level in the 1-time exhaustive group was significantly decreased (PvO.Ol), and the levels of IgG, IgA and IgM in the 4-time exhaustive group and the 7-time exhaustive group were all sign ifica ntly decreased (P<0.05 or PvO.Ol), while the ACP level was in creased sign ifica ntly (both P<0.01). Microscopically, the number of splenic corpuscles in the 1-time exhaustive group was reduced;the center of some splenic corpuscles in the 4-time exhaustive group was damaged;the number of splenic corpuscles in the 7-time exhaustive group was reduced, and there was no obvious germinal center. Compared with the 4-time exhaustive group, the IgA level in the 4-time moxibusti on group was sign ifica ntly in creased (P<0.01), and the ACP level was sign ifica ntly decreased (P<0.01). Compared with the 7-time exhaustive group, the levels of IgG, IgA and IgM in the 7-time moxibustion group were sign ifica ntly in creased (all PvO.Ol), and the ACP level was sign ifica ntly decreased (P<0.01). Microscopically, the nu mber of splenic corpuscles in the 1-time moxibustion group was reduced;the center of some splenic corpuscles in the 4-time moxibustion group was damaged together with hyperplasia of some splenic corpuscles;blast cells were proliferated in the center of some splenic corpuscles in the 7-time moxibustion group. Conclusion: Moxibustion at Shenque (CV 8) can improve the levels of IgG, IgA and IgM, reduce the ACP level, repair damaged spleen tissues, and enhance the immunity of the body to some extent in the Iong-term fatigue rats.展开更多
Objective:To observe the effects of moxibustion at Shenshu(BL 23),Zusanli(ST 36)and Shenque(CV 8)on the energy metabolism and endocrine metabolism indicators of rats undergoing one-time exhaustive swimming,and to expl...Objective:To observe the effects of moxibustion at Shenshu(BL 23),Zusanli(ST 36)and Shenque(CV 8)on the energy metabolism and endocrine metabolism indicators of rats undergoing one-time exhaustive swimming,and to explore the differences between moxibustion at different points in the effects on anti-exercise fatigue.Methods:Forty-eight male SPF rats were randomly divided into a blank group,a model group,a non-meridian and non-acupoint group,a Shenshu(BL 23)group,a Zusanli(ST 36)group,and a Shenque(CV 8)group using random number table method,with eight rats in each group.Except for the blank group,rats in the other groups were subjected to replicating the one-time exhaustive model using the weight-bearing swimming experiment.Except for the model group,the other model rats received mild moxibustion immediately after swimming.Rats in the non-meridian and non-acupoint group received mild moxibustion at bilateral subcostal non-meridian and non-acupoint points,those in the Shenshu(BL 23)group received mild moxibustion at bilateral Shenshu(BL 23),those in the Zusanli(ST 36)group received mild moxibustion at bilateral Zusanli(ST 36),and those in the Shenque(CV 8)group received mild moxibustion at Shenque(CV 8)for 15 min.Four hours after the exhaustive swimming,femoral artery blood was collected to detect blood lactate(BLA),lactate dehydrogenase(LDH),creatine kinase(CK),creatinine(CRE),blood urea nitrogen(BUN),cortisol(C)and testosterone(T)levels,and calculate the T/C ratio.Results:Compared with the blank group,rat's serum levels of BLA,LDH,CK,BUN and C in the model group and the non-meridian and non-acupoint group were increased,and serum levels of CRE and T,and T/C ratios were decreased(P<0.01 or P<0.05);compared with the model group and the non-meridian and non-acupoint group,the serum levels of BLA,LDH,CK,BUN and C in the Shenshu(BL 23)group,Zusanli(ST 36)group and Shenque(CV 8)group were decreased,and the serum CRE and T levels,and the T/C ratios were increased(all P<0.01);compared with the Shenshu(BL 23)group,the serum CK level was decreased in the Shenque(CV 8)group(P<0.01),the serum levels of T and C were decreased in the Zusanli(ST 36)group and Shenque(CV 8)group(P<0.01 or P<0.05),and the T/C ratio was increased in the Shenque(CV 8)group(P<0.01);compared with the Zusanli(ST 36)group,the serum CK and BUN levels were decreased(P<0.01,P<0.05),and the T/C ratio was increased in the Shenque(CV 8)group(P<0.05).Conclusion:Moxibustion at Shenshu(BL 23),Zusanli(ST 36)and Shenque(CV 8)shows different anti-fatigue effects by regulating the energy metabolism and endocrine metabolism in rats undergoing one-time exhaustive swimming.Moxibustion at Shenshu(BL 23)is better in promoting energy synthesis.Moxibustion at Shenque(CV 8)is more effective in regulating synthesis and decomposition of the skeletal muscle proteins.展开更多
Extreme heat events contribute to high mortality[1,2]and overwhelm emergency medical services through increased ambulance calls and overcrowded emergency departments.[3]Because morbidity and mortality are directly rel...Extreme heat events contribute to high mortality[1,2]and overwhelm emergency medical services through increased ambulance calls and overcrowded emergency departments.[3]Because morbidity and mortality are directly related to both the degree and duration of hyperthermia,timely recognition and management of heat exhaustion and heat stroke are critical for preventing death and reducing healthcare burdens.展开更多
Exercise produces a decrease in pain sensitivity via an effect called exercise-induced hypoalgesia(EIH).Transcranial direct current stimulation(tDCS),acting on similar analgesic mechanisms as EIH,represents a potentia...Exercise produces a decrease in pain sensitivity via an effect called exercise-induced hypoalgesia(EIH).Transcranial direct current stimulation(tDCS),acting on similar analgesic mechanisms as EIH,represents a potential complementary intervention that may amplify the effects of exercise on pain.This study aimed to explore if anodal tDCS could enhance the effect of exercise on pain compared to exercise alone.A total of 35 healthy participants aged 19–37 years completed a familiarisation session followed by two separate sessions where active and sham tDCS was applied in a randomised cross-over design.The familiarisation session involved familiarisation to the pain assessment and exercise tasks,while the subsequent tDCS sessions involved pain sensitivity assessment,exercise and either anodal tDCS or sham tDCS.tDCS doses were applied at 2 mA over the primary motor cortex for 10 min,with the reference electrode placed over the contralateral supraorbital area.The exercise task involved a sustained isometric grip strength contraction at 35%of maximal voluntary contraction(MVC)until volitional exhaustion.Pain sensitivity was evaluated as pressure pain threshold before tDCS,after tDCS,and after exercise.Across both tDCS conditions,pain threshold was higher after exercise when compared to pre-and post-tDCS measurement.This increase in pain threshold did not differ between active and sham tDCS conditions.Our findings suggest that the hypoalgesic effects of active anodal tDCS over the motor cortex prior to exercise are no greater than the effects of sham tDCS prior to exercise.展开更多
In recent years the crucial role of CD4^(+)T cells in tumor immunomodulation has garnered increasing recognition.While conventional cancer immunotherapy research has predominantly focused on the cytotoxic function of ...In recent years the crucial role of CD4^(+)T cells in tumor immunomodulation has garnered increasing recognition.While conventional cancer immunotherapy research has predominantly focused on the cytotoxic function of CD8+T cells,emerging evidence has now shown that CD4^(+)T cells enhance antitumor immunity by delivering co-stimulatory signals,secreting cytokines,and promoting cytotoxic T lymphocyte(CTL)activation and display unique immunoregulatory capabilities through direct tumor cell killing or remodeling of the tumor microenvironment.The high heterogeneity and functional plasticity of CD4^(+)T cell subsets significantly influence clinical responses to immunotherapy with underlying mechanisms involving multi-level regulatory networks,including epigenetic modulation and metabolic reprogramming.Deciphering the functional heterogeneity of CD4^(+)T cells and the interactions with the tumor microenvironment will provide essential mechanistic insights for next-generation immunotherapies,such as immune checkpoint inhibitors and chimeric antigen receptor T(CAR-T)therapies,thereby advancing personalized treatment paradigms.展开更多
Unmanned combat aerial vehicles require lightweight,stealth-capable exhaust systems.However,traditional metallic nozzles increase radar detectability and reduce range,while advanced composites offer high performance b...Unmanned combat aerial vehicles require lightweight,stealth-capable exhaust systems.However,traditional metallic nozzles increase radar detectability and reduce range,while advanced composites offer high performance but are expensive.Therefore,to improve the operational range and survivability of unmanned combat aerial vehicles,a lightweight,high-temperature-resistant,oxidation-resistant,and low-observable composite exhaust nozzle is developed to replace conventional metallic straight-type nozzles.The nozzle features a double serpentine shape to reduce radar and infrared signatures and is manufactured as a monolithic structure using the filament winding process,accommodating the complex geometry and large size(length:1.8 m,width:0.8 m).The exhaust nozzle consists of a ceramic matrix composite made of silicon carbide fibers and a silicon oxycarbide matrix,which absorbs and scatters radio frequency signals while withstanding prolonged exposure to high-temperature(700℃)oxidizing environments typical of engine exhaust gases.The polysiloxane resin used to produce the silicon oxycarbide matrix poses significant challenges owing to its low tackiness and high viscosity variations depending on the presence of nanoparticles,making filament winding difficult.These challenges are addressed by optimizing resin viscosity and winding pattern design.As a result,the tensile strength of the composite specimens fabricated with the optimized viscosity increases by 228.03% before pyrolysis and 97.68%after pyrolysis,compared with that of the non-optimized specimens.In addition,the density and tensile strength of the composite processed via three cycles of polymer infiltration and pyrolysis increased by 13.08% and 80.37%,respectively,compared to those of the non-densified composite.High-temperature oxidation and flame tests demonstrate exceptional thermal and oxidative stability.Furthermore,when compared with carbon fiber-reinforced ceramic matrix composites,the developed composite exhibits a permittivity at least two levels lower and a reflection loss below7 dB within the frequency range of 9.3-10.9 GHz,underscoring its superior electromagnetic stealth performance.展开更多
Background Overtraining Syndrome(OTS)is a condition resulting from excessive physical activity without adequate recovery,predominantly affecting elite athletes and military personnel.While overreaching can be a tempor...Background Overtraining Syndrome(OTS)is a condition resulting from excessive physical activity without adequate recovery,predominantly affecting elite athletes and military personnel.While overreaching can be a temporary state,non-functional overreaching may progress to chronic OTS.This review explores various hypotheses regarding the pathogenesis of OTS,including glycogen depletion,dysregulated cytokine response,oxidative stress,and alterations in the autonomic nervous system function.It also highlights the systemic impact of OTS on multiple organ systems,immune function,and overall health,linking the condition to chronic inflammation and an increased disease susceptibility.Additionally,it addresses the role of the gut microbiome in health modulation through physical activity.Methods This narrative review was conducted through a structured search of peer-reviewed journal articles in databases such as PubMed,Web of Science,and Google Scholar,focusing on studies involving human participants and published in English.Results OTS has systemic effects on multiple organ systems,immune function,and overall health,leading to chronic inflammation and increased disease susceptibility.Athletes with OTS exhibit higher morbidity rates,influenced by factors such as sleep deprivation and stress.The review also emphasizes the role of the gut microbiome as a significant modulator of health through physical activity.Conclusion Balanced training and recovery are crucial for preventing OTS and maintaining optimal health and quality of life in physically active individuals.Understanding the complex pathophysiology of OTS is essential for developing effective prevention and treatment strategies.展开更多
基金Supported by Natural Science Fund project of youth of Hebei Education Department:QN2016021key scientific project of Administration of Traditional Chinese Medicine of Hebei Province:2016011
文摘Objective To explore the effect of moxibustion at ＂Shénquè＂（神阙 CV 8） on the immune system of rats taking long-term exhaustive exercise.Method Thirty male SD rats were randomly divided into blank group,model group and moxibustion group with 10 rats in each group.Except the rats in blank group,all the rats were established into long-term exhaustive models through swimming again and again.Mild moxibustion at CV 8 for 15 min was carried out in the rats in moxibustion group after modeling.The treatment was conducted once every other day,and treatment for 10 times was needed.The exhaustive duration for each time was recorded,the levels of serum Ig A,Ig G,Ig M and ACP were detected 24 h after the 10 th exhaustive exercise,and the histomorphological changes of spleen were observed.Immunoturbidimetry was adopted for detecting the Ig A level,and ELISA method was used for detecting the levels of Ig G,Ig M and ACP.Results The common exhaustive duration in moxibustion group was longer than that in model group,however,the time difference was statistically significant after the 5th exhaustive exercise（P0.01）.The levels of serum IgG and IgM in model group were lower than that in blank group（all P0.01）,and the serum ACP level in model group was higher than that in blank group（P0.01）,indicating that the splenic histomorphology was damaged.The levels of serum Ig G and Ig M in moxibustion group were higher than that in model group（all P0.01）,and the serum ACP level in moxibustion group was lower than that in model group,showing that the splenic histomorphology was repaired.Conclusion Moxibustion at CV 8 can improve the levels of immunoglobulin（Ig G,Ig A,Ig M） of tired body for a long time,decrease the ACP level,and repair the damaged spleen tissues.
基金Supported by Natural Science Fund Project of Youth of Hebei Education Department:QN2016021Key Scientific Project of Administration of Traditional Chinese Medicine of Hebei Province:2016011 and 2017011
文摘Objective To explore the effect of moxibustion at Shenque （神阙 CV 8） on the anti-exercise-induced fatigue in rats after exhaustive exercise in varying degrees. Methods Seventy-two SD rats were randomly divided into 3 groups according to the random number table method, including blank group, model group and moxibustion group. The model group and moxibustion group were divided into 4 subgroups respectively, that was 1 time, 4 times, 7 times and 10 times subgroup. There were 9 groups with 8 rats in each group. Except blank group, all the rats were established into exhaustive models through swimming. Mild moxibustion at CV 8 was carried out for 15 min in the rats in moxibustion group after modeling for once every other day. The concentration of serum glucose （GLU）, malonaldehyde （MDA） and blood urea nitrogen （BUN） as well as the activity of aspartate transaminase （AST）, alanine transaminase （ALT） and lactic dehydrogenase （LDH） were detected 24h after the exhaustive exercise by adopting full-automatic analyzer. Results The exhaustive time of rats were long at first but shorter later. The exhaustive time of rats in the model group （4 times） were obviously longer than that in the model group （1 time） （P〈0.01）, the exhaustive time of rats in the model group （7 times） and model group （10 times） were obviously shorter than that in the model group （1 time） （P〈0.01）, and the exhaustive time of rats in the moxibustion group （7 times） and moxibustion group （10 times） were obviously longer than that in the model group with the same number of times （P〈0.01）, the serum GLU level of rats in the model group （7 times） and model group （10 times） increased when compared with the blank group （P〈0.01）, and the serum MDA and BNU levels as well as the activity of AST, ALT and LDH of rats in the model group （4 times）, model group （7 times） and model group （10 times） increased when compared with the blank group （P〈0.05 or P〈0.01）, the serum GLU, MDA and BNU levels as well as the activity of AST and ALT of rats in the moxibustion group （7 times） and moxibustion group （10 times） reduced when compared with the model group with the same number of times （P〈0.05 or P〈0.01）, and the serum LDH activity of rats in the moxibustion group （4 times）, moxibustion group （7 times） and moxibustion group （10 times） reduced when compared with the model group with the same number of times （P〈0.05 or P〈0.01）. Conclusion Moxibustion at CV 8 can reduce the serum MDA and BNU levels as well as the activity of AST, ALT and LDH of organism in a status of long-term fatigue, effectively improve the symptom of long-term fatigue, providing a certain experimental basis for the clinical application of moxibustion at CV 8 in the process of anti-exercise-induced fatigue in the future.
基金supported by Chinese Postdoctoral Science Foundation(No.2014N560538)Hainan Province Colleges and Universities Scientific Research Project(No.Hnky2015-34)Project of Natural Science Foundation of Hainan Province(314090)
文摘Objective: To investigate the expression of myocardium connexin 43(Cx43) in late exercise preconditioning(LEP) cardioprotection. Methods: Eight-week-old adult male Sprague Dawley rats were randomly assigned into four groups(n=8). Myocardial injury was judged in accordance with serum levels of c Tn and NT-pro BNP as well as hematoxylin basicfuchsin picric acid staining of myocardium. Cx43 m RNA was detected by in situ hybridization and qualified by real-time fluorescence quantitative PCR. Cx43 protein was localized by immunohistochemistry and its expression level was determined by western blotting. Results: The LEP obviously attenuated the myocardial ischemia/hypoxia injury caused by exhaustive exercise. There was no significant difference of Cx43 m RNA level between the four groups. Cx43 protein level was decreased significantly in group EE(P<0.05). However, LEP produced a significant increase in Cx43 protein level(P<0.05), and the decreased Cx43 protein level in exhaustive exercise was significantly up-regulated by LEP(P<0.05). Conclusions: LEP protects rat heart against exhaustive exercise-induced myocardial injury by up-regulating the expression of myocardial Cx43.
基金Sponsored by the National Natural Science Foundation of China (Grant No. 61101126)the Postdoctoral Science Foundation of China (Grant No.2011M500664)
文摘Orthogonal frequency division multiplexing(OFDM) is an attractive technology to provide immense improvement in wireless transmission capacity but high peak-to-average power ratio(PAPR) is a major drawback of OFDM system.Selected mapping(SLM) scheme has good performance for PAPR reduction.It requires the transmitting data to be multiplied by random phase sequences.However,the sequences are pseudo-random which will decrease the method effectiveness.Exhaustive entropy is introduced in this paper which can identify the strength of random phase sequences property.Then an exhaustive entropy based on SLM method is proposed.The scheme improves the effectiveness of random phase sequences by selecting the larger exhaustive entropy of them.The simulation results show that the PAPR reduction performance is better than that of conventional SLM through this method.
文摘BACKGROUND： Exhaustive exercise can lead to apoptosis of skeletal muscle cells and myocardial cells as a result of pathological changes in the corresponding cellular ultrastructure. It is hypothesized that such changes could also occur in neurons. OBJECTIVE： To observe brain cell apoptosis and ultrastructural changes in hippocampal neurons in rats following endurance training and acute exhaustive exercise. DESIGN, TIME AND SETTING： A randomized, controlled, morphological analysis was performed at the Medical Laboratory Center of Zhengzhou University between July and November 2007. MATERIALS： Forty male, 8-week-old, Sprague Dawley rats were included in this study. METHODS： Endurance training consisted of treadmill running once a day, 6 days a week, for 4. weeks. For acute exhaustive exercise, graded treadmill running was conducted. Rats were exposed to exercise at an increasing speed （10 m/min, increasing to 20 and 36 m/min for moderate- and high-intensity exhaustive exercise, respectively, and then was continued until exhaustion）. A total of 40 rats were evenly distributed into the following 4. groups： Group A rats were not exercised; Group B rats were not trained but sacrificed 24 hours after acute exhaustive treadmill running exercise; Group C-rats were subjected to endurance training and sacrificed immediately after acute exhaustive treadmill running exercise; Group D rats were subjected to endurance training and sacrificed 24 hours after acute exhaustive treadmill running exercise. MAIN OUTCOME MEASURES： Apoptotic cell death was detected by the TUNEL method and hippocampal neuronal ultrastructural change was observed through using transmission electron microscopy. RESULTS： All 40 rats were included in the final analysis. Subsequent to exhaustive exercise, rat cerebral cortex and hippocampal neurons appeared contracted and degenerated. In addition, high amount of lipofuscin was visible in the hippocampal region, Necrotic neurons encased by glial cells appeared in the cerebral cortex and hippocampus. Glial cells exhibited different degrees of swelling. Subsequent to exhaustive exercise, brain cell apoptosis rate significantly increased, and reached over 30% in some regions, compared with group A （P 〈 0.05）. No significant difference in apoptosis rate existed between groups B, C, and D （P 〈 0.05）. CONCLUSION： Endurance training and acute exhaustive exercise cause, to some degree, injuries to glial cells, resulting in apoptosis of numerous brain cells. Subsequent to exhaustive exercise, high amounts of lipofuscin appear in the hippocampus, indicating that exhaustive exercise possibly contributes to neural cell aging or dysmetabolism.
基金partially supported by the National Natural Science Foundation of China (31702248, 31402176, 31372419 and 31522057)the National Science Foundation for Postdoctoral Scientists of China (Grant No. 20163M590701)+2 种基金the National Program on Key Research Project of China (2016YFD0500400)the Fundamental Research Funds for the Central Universities (2662016QD036, to MZ) the Ministry of Agriculture of China (special fund for Agro-scientific research in the Public Interest, 201303042)
文摘Rabies is one of the most dangerous and widespread zoonosis and is characterized by severe neurological signs and a high case-mortality rate of nearly 100%. Vaccination is the most effective way to prevent rabies in humans and animals. In this study, the relationship between exhaustive exercise and the humoral immune response after immunization with inactivated rabies vaccine was investigated in a mouse model with one-time exhaustive exercise. It was found that compared with the mice with no exercise after vaccination, no significant differences were found in those with exhaustive exercise after vaccination on body-weight changes, virus-neutralizing antibody(VNA) titers, antibody subtypes and survivor ratio after lethal rabies virus(RABV) challenge. This study indicated that exhaustive exercise does not reduce the effects of the rabies inactivated vaccine.
基金supported by the Guangxi Provincial Foundation of Natural Science(No.0481019).
文摘A sensitive method for the determination of ephedrine and codeine in human urine by capillary electrophoresis （CE） was described. In order to improve the sensitivity, two online concentration techniques including cation-selective exhaustive injection （CSEI） and sweeping micellar electrokinetic chromatography （sweeping-MEKC） were used. Under the optimum conditions, the detection limits （S/N = 3） were 0.10 μg/L for ephedrine and 0.80 μg/L for codeine. This method was successfully applied to real urine sample analysis.
基金The Medical and Health Science and Technology Development Planning Project of Shandong Province(202103011061)。
文摘Objective:To clarify the effect of endurance training on the expression profile of circRNA-lncRNA-miRNA-mRNA in myocardial tissues of mice after exhaustive exercise.Methods:A total of 45 male C57BL/6 mice were randomly divided into control(C),low-strength endurance training(LSET)and high-strength endurance training(HSET)groups(n=15).The mice in the control group were not conducted to platform training.The mice in the LSET and HSET groups were conducted to platform training at 30%and 60%of exhaustive exercise once a day for 5 days a week,respectively.The exhaustion exercise was performed after 5 weeks of platform training.Total RNA was extracted from myocardial tissues,and the expression profile of circRNA-lncRNA-miRNA-mRNA in myocardial tissues was analyzed using Illimina transcriptome sequencing.Results:The distance and time of exhaustive exercise were longer in the LSET and HSET groups than in the control group,and the distance and time of exhaustive exercise were longer in the HSET group than in the LSET group(P<0.05).A total of 54 differentially expressed circRNAs(28 down-regulated and 26 up-regulated),7 differentially expressed lncRNAs(all down-regulated),3 differentially expressed miRNAs(1 down-regulated and 2 up-regulated)and 99 differentially expressed mRNAs(81 down-regulated and 18 up-regulated)were identified by transcriptome sequencing(P<0.05).Interaction network analysis revealed that ENSMUSG00000113041,MSTRG.79740,mmu-miR-374c-5p,18 down-regulated mRNAs and 3 up-regulated mRNAs formed a regulatory network.GO functional analysis revealed that the differentially expressed mRNAs were mainly enriched in primary metabolic processes and macromolecular synthesis and metabolic processes.KEGG pathway analysis revealed that the differentially expressed mRNAs were mainly enriched in complement and coagulation cascade pathways,estrogen signaling pathway and glucagon signaling pathway.Conclusion:Endurance training could alter the expression profile of circRNA-lncRNA-miRNA-mRNA in myocardial tissues of mice after exhaustive exercise,and these differentially expressed RNAs form a regulatory network that affects cardiomyocyte synthesis and metabolism and thus participates in the regulation of myocardial injury.
文摘In this paper,we identify the distinction between non-brute-force computation and brute-force computation as the most fundamental problem in computer science.Subsequently,we prove,by the diagonalization method,that constructed self-referential CSPs cannot be solved by nonbrute-force computation,which is stronger than P≠NP.This constructive method for proving impossibility results is very different(and missing)from existing approaches in computational complexity theory,but aligns with Gödel’s technique for proving logical impossibility.Just as Gödel showed that proving formal unprovability is feasible in mathematics,our results show that proving computational hardness is not hard in mathematics.Specifically,proving lower bounds for many problems,such as 3-SAT,can be challenging because these problems have various effective strategies available to avoid exhaustive search.However,for self-referential examples that are extremely hard,exhaustive search becomes unavoidable,making its necessity easier to prove.Consequently,it renders the separation between non-brute-force computation and brute-force computation much simpler than that between P and NP.Finally,our results are akin to Gödel’s incompleteness theorem,as they reveal the limits of reasoning and highlight the intrinsic distinction between syntax and semantics.
文摘Objective： To investigate the effect of moxibustion at Shenque （CV 8） on free radical metabolism in rat＇s hippocampus after different degrees of exhaustive exercise. Methods： A total of 72 male Sprague-Dawley （SD） rats were randomly divided into a normal group （n=8）, a model group （n=32） and a moxibustion group （n=32）. According to the times of modeling or treatment, the model group was further randomly divided into different subgroups of a 1-time model subgroup, a 4-time model subgroup, a 7-time model subgroup and a 10-time model subgroup （n=8）; the moxibustion group was also further randomly divided into different subgroups of a 1-time moxibustion subgroup, a 4-time moxibustion subgroup, a 7-time moxibustion subgroup and a 10-time moxibustion subgroup （n=8）. Rats in both model and moxibustion subgroups were subjected to establishing the swimming exhaustive model. Rats in each moxibustion subgroup received mild moxibustion at Shenque （CV 8） for 15 min immediately after modeling, once every other day. The concentration of malic dialdehyde （MDA）, as well as the activities of superoxide dismutase （SOD）, glutathione peroxidase （GSH-Px） and total antioxidant capacity （T-AOC） in rat＇s hippocampus in each group were detected 24 h after the exhaustive exercise. Results： Compared with the 1-time model subgroup, the exhaustive swimming time of rats was significantly prolonged in the 4-time model subgroup （P〈0.01）, while it was significantly shortened in the 7-time and 10-time model subgroups （both P〈0.01）. Compared with the matched model subgroup, the exhaustive swimming time of rats in the 7-time and 10-time moxibustion subgroups was significantly prolonged （both P〈0.01）. Compared with the normal group, the MDA concentration was increased significantly （P〈0.01）, and the activities stress response of SOD and T-AOC were increased in the 1-time model subgroup （both P〈0.05）; the MDA concentration was increased （all P〈0.01）, and the activities of SOD, GSH-Px and T-AOC were decreased differently （P〈0.05 or P〈0.01） in the 4-time, 7-time and 10-time model subgroups. Compared with the matched model subgroup, the concentration of MDA was significantly reduced （P〈0.05 or P〈0.01）, and the activities of SOD, GSH-Px and T-AOC were significantly increased in the 4-time, 7-time and 10-time moxibustion subgroups （all P〈0.01）. Conclusion： Moxibustion at Shenque （CV 8） can improve the fatigue status of the body after long-term exhaustive exercise by regulating free radical metabolism in rat＇s hippocampus. To some extent, this provides an experimental basis for moxibustion at Shenque （CV 8） against exercise-induced fatigue.
基金The study was supported by the grants from National Natural Science Foundation of China，Outstanding Scientific Fund of Shengjing Hospital
文摘Background Little is known about the value of 31P-magnetic resonance spectroscopy （31P-MRS） in in vivo assessment of exhaustive exercise-induced injury in skeletal muscle.We aimed to evaluate the value of a 31P-MRS study using the quadriceps femoris after a single bout of acute exhaustive swimming in rats,and the correlation between 31P-MRS and histological changes.Methods Sixty male Sprague-Dawley rats were randomly assigned to control,half-exhaustive,and exhaustive exercise groups.31P-MRS of the quadriceps femoris of the right lower limb was performed immediately after swimming exercise to detect Pi,PCr,and β-ATP.The Pi/PCr,Pi/β-ATP,PCr/β-ATP,and PCr/（PCr＋Pi） were calculated and pH measured.Areas under the receiver operating characteristic curve （AUCs） were calculated to evaluate the diagnostic potential of 31P-MRS in identifying and distinguishing the three groups.HE staining,electron microscopy and desmin immunostaining after imaging of the muscle were used as a reference standard.The correlation between 31P-MRS and the mean absorbance （A value） of desmin staining were analyzed with the Pearson correlation test.Results Pi,PCr,Pi/PCr,and PCr/（PCr＋Pi） showed statistically significant intergroup differences （P＜0.05）.AUCs of Pi,PCr,Pi/PCr,and PCr/（PCr＋Pi） were 0.905,0.848,0.930,and 0.930 for the control and half-exhaustive groups,while sensitivity and specificity were 90％/85％,95％/55％,95％/80％,and 90％/85％,respectively.The AUCs of Pi,PCr,Pi/PCr and PCr/（PCr＋Pi） were 0.995,0.980,1.000,and 1.000 for the control and exhaustive groups,while sensitivity and specificity were 95％/90％,100％/90％,100％/95％,and 100％/95％,respectively.The AUCs of Pi,PCr,Pi/PCr,and PCr/（PCr＋Pi） were 0.735,0.865,0.903,and 0.903 for the half-exhaustive and exhaustive groups,while sensitivity and specificity were 80％/60％,90％/75％,95％/65％,and 95％/70％,respectively.In the half-exhaustive group,some muscle fibers exhibited edema in HE staining,and the unclear Z-discs and the mitochondria with vacuolar degeneration under electron microscopy.Compared with the half-exhaustive group,muscle fiber edema was increased in the exhaustive group,and the Z-discs were broken and the mitochondria exhibited marked vacuolar degeneration under electron microscopy.There were significant difference in A values of desmin staining in the right vastus lateralis among the control,half-exhaustive,and exhaustive groups with 0.58±0.06,0.30±0.04,and 0.21±0.02,respectively （P＜0.05）.Histological examination also showed injury-induced changes in the vastus lateralis among the different intensities groups.Statistically a moderate correlation between 31P-MRS and desmin was observed,the correlation coefficients of Pi,PCr,Pi/PCr,and PCr/（PCr＋Pi） were-0.706,0.709,-0.726,and 0.791,respectively （P＜0.01）.Conclusions 31P-MRS can effectively reflect the changes in energy metabolism in the skeletal muscle after a single bout of acute exhaustive swimming in rats.Based on the significant correlation between 31P-MRS parameters and histological changes,the changes of Pi,PCr,Pi/PCr,and PCr/（PCr＋Pi） can indirectly reflect the degree of exercise-induced injury.
文摘Objective: To investigate the effect of moxibustion at Shenque (CV8) on the immune system in rats with different levels of exhaustive exercise. Methods: Fifty-six male Sprague-Dawley (SD) rats were randomly divided into a blank group (n=8), an exhaustive group (n=24), and a moxibustion group (n=24). The exhaustive group was randomly divided into a 1-time exhaustive group, a 4-time exhaustive group and a 7-time exhaustive group, with 8 rats in each group. According to the treatment time, the moxibustion group was randomly divided into a 1-time moxibustion group, a 4-time moxibustion group and a 7-time moxibustion group, with 8 rats in each group. Rats in the exhaustive groups and the moxibustion groups were subjected to replicating the exhaustive swimming models. Rats in each moxibustion group received mild moxibustion for 15 min immediately after the exhaustive modeling, once every other day. Twenty-four hours after the corresponding exhaustive exercise, the rats in each group were tested for the levels of serum immunoglobulin (Ig) G, IgA, IgM and acid phosphatase (ACP), and the morphological changes of spleen tissues were observed. The level of IgA was detected by immunoturbidimetric assay, and the levels of IgG, IgM and ACP were detected by en zyme-linked imm uno sorb ent assay (ELISA). Results: Compared with the 1-time exhaustive group, swimming time of rats in the 4-time exhaustive group was significantly proIonged (P<0.01), and swimming time of rats in the 7-time exhaustive group was significantly shortened (P<0.01). Compared with the 7-time exhaustive group, exhaustive swimming time of rats in the 7-time moxibustion group was significantly proIonged (P<0.01). Compared with the blank group, the IgG level in the 1-time exhaustive group was significantly decreased (PvO.Ol), and the levels of IgG, IgA and IgM in the 4-time exhaustive group and the 7-time exhaustive group were all sign ifica ntly decreased (P<0.05 or PvO.Ol), while the ACP level was in creased sign ifica ntly (both P<0.01). Microscopically, the number of splenic corpuscles in the 1-time exhaustive group was reduced;the center of some splenic corpuscles in the 4-time exhaustive group was damaged;the number of splenic corpuscles in the 7-time exhaustive group was reduced, and there was no obvious germinal center. Compared with the 4-time exhaustive group, the IgA level in the 4-time moxibusti on group was sign ifica ntly in creased (P<0.01), and the ACP level was sign ifica ntly decreased (P<0.01). Compared with the 7-time exhaustive group, the levels of IgG, IgA and IgM in the 7-time moxibustion group were sign ifica ntly in creased (all PvO.Ol), and the ACP level was sign ifica ntly decreased (P<0.01). Microscopically, the nu mber of splenic corpuscles in the 1-time moxibustion group was reduced;the center of some splenic corpuscles in the 4-time moxibustion group was damaged together with hyperplasia of some splenic corpuscles;blast cells were proliferated in the center of some splenic corpuscles in the 7-time moxibustion group. Conclusion: Moxibustion at Shenque (CV 8) can improve the levels of IgG, IgA and IgM, reduce the ACP level, repair damaged spleen tissues, and enhance the immunity of the body to some extent in the Iong-term fatigue rats.
文摘Objective:To observe the effects of moxibustion at Shenshu(BL 23),Zusanli(ST 36)and Shenque(CV 8)on the energy metabolism and endocrine metabolism indicators of rats undergoing one-time exhaustive swimming,and to explore the differences between moxibustion at different points in the effects on anti-exercise fatigue.Methods:Forty-eight male SPF rats were randomly divided into a blank group,a model group,a non-meridian and non-acupoint group,a Shenshu(BL 23)group,a Zusanli(ST 36)group,and a Shenque(CV 8)group using random number table method,with eight rats in each group.Except for the blank group,rats in the other groups were subjected to replicating the one-time exhaustive model using the weight-bearing swimming experiment.Except for the model group,the other model rats received mild moxibustion immediately after swimming.Rats in the non-meridian and non-acupoint group received mild moxibustion at bilateral subcostal non-meridian and non-acupoint points,those in the Shenshu(BL 23)group received mild moxibustion at bilateral Shenshu(BL 23),those in the Zusanli(ST 36)group received mild moxibustion at bilateral Zusanli(ST 36),and those in the Shenque(CV 8)group received mild moxibustion at Shenque(CV 8)for 15 min.Four hours after the exhaustive swimming,femoral artery blood was collected to detect blood lactate(BLA),lactate dehydrogenase(LDH),creatine kinase(CK),creatinine(CRE),blood urea nitrogen(BUN),cortisol(C)and testosterone(T)levels,and calculate the T/C ratio.Results:Compared with the blank group,rat's serum levels of BLA,LDH,CK,BUN and C in the model group and the non-meridian and non-acupoint group were increased,and serum levels of CRE and T,and T/C ratios were decreased(P<0.01 or P<0.05);compared with the model group and the non-meridian and non-acupoint group,the serum levels of BLA,LDH,CK,BUN and C in the Shenshu(BL 23)group,Zusanli(ST 36)group and Shenque(CV 8)group were decreased,and the serum CRE and T levels,and the T/C ratios were increased(all P<0.01);compared with the Shenshu(BL 23)group,the serum CK level was decreased in the Shenque(CV 8)group(P<0.01),the serum levels of T and C were decreased in the Zusanli(ST 36)group and Shenque(CV 8)group(P<0.01 or P<0.05),and the T/C ratio was increased in the Shenque(CV 8)group(P<0.01);compared with the Zusanli(ST 36)group,the serum CK and BUN levels were decreased(P<0.01,P<0.05),and the T/C ratio was increased in the Shenque(CV 8)group(P<0.05).Conclusion:Moxibustion at Shenshu(BL 23),Zusanli(ST 36)and Shenque(CV 8)shows different anti-fatigue effects by regulating the energy metabolism and endocrine metabolism in rats undergoing one-time exhaustive swimming.Moxibustion at Shenshu(BL 23)is better in promoting energy synthesis.Moxibustion at Shenque(CV 8)is more effective in regulating synthesis and decomposition of the skeletal muscle proteins.
文摘Extreme heat events contribute to high mortality[1,2]and overwhelm emergency medical services through increased ambulance calls and overcrowded emergency departments.[3]Because morbidity and mortality are directly related to both the degree and duration of hyperthermia,timely recognition and management of heat exhaustion and heat stroke are critical for preventing death and reducing healthcare burdens.
文摘Exercise produces a decrease in pain sensitivity via an effect called exercise-induced hypoalgesia(EIH).Transcranial direct current stimulation(tDCS),acting on similar analgesic mechanisms as EIH,represents a potential complementary intervention that may amplify the effects of exercise on pain.This study aimed to explore if anodal tDCS could enhance the effect of exercise on pain compared to exercise alone.A total of 35 healthy participants aged 19–37 years completed a familiarisation session followed by two separate sessions where active and sham tDCS was applied in a randomised cross-over design.The familiarisation session involved familiarisation to the pain assessment and exercise tasks,while the subsequent tDCS sessions involved pain sensitivity assessment,exercise and either anodal tDCS or sham tDCS.tDCS doses were applied at 2 mA over the primary motor cortex for 10 min,with the reference electrode placed over the contralateral supraorbital area.The exercise task involved a sustained isometric grip strength contraction at 35%of maximal voluntary contraction(MVC)until volitional exhaustion.Pain sensitivity was evaluated as pressure pain threshold before tDCS,after tDCS,and after exercise.Across both tDCS conditions,pain threshold was higher after exercise when compared to pre-and post-tDCS measurement.This increase in pain threshold did not differ between active and sham tDCS conditions.Our findings suggest that the hypoalgesic effects of active anodal tDCS over the motor cortex prior to exercise are no greater than the effects of sham tDCS prior to exercise.
基金supported by The National Key Research and Development Program of China(Grant No.2021YFA0910100)Healthy Zhejiang One Million People Cohort(Grant No.K-20230085)+6 种基金supported by National Natural Science Foundation of China(Grant Nos.82304946 and 82573745)Post-doctoral Innovative Talent Support Program(Grant No.BX2023375)567 Foundation of Zhejiang Province(Grant No.LMS25H160006)supported by the National Natural Science Foundation of China(Grant No.82473489)the Medical Science and Technology Project of Zhejiang Province(Grant No.WKJ-ZJ-2202)the Natural Science Foundation of Zhejiang Province(Grant No.LBD24H290001)supported by the National Natural Science Foundation of China(Grant No.82403546).
文摘In recent years the crucial role of CD4^(+)T cells in tumor immunomodulation has garnered increasing recognition.While conventional cancer immunotherapy research has predominantly focused on the cytotoxic function of CD8+T cells,emerging evidence has now shown that CD4^(+)T cells enhance antitumor immunity by delivering co-stimulatory signals,secreting cytokines,and promoting cytotoxic T lymphocyte(CTL)activation and display unique immunoregulatory capabilities through direct tumor cell killing or remodeling of the tumor microenvironment.The high heterogeneity and functional plasticity of CD4^(+)T cell subsets significantly influence clinical responses to immunotherapy with underlying mechanisms involving multi-level regulatory networks,including epigenetic modulation and metabolic reprogramming.Deciphering the functional heterogeneity of CD4^(+)T cells and the interactions with the tumor microenvironment will provide essential mechanistic insights for next-generation immunotherapies,such as immune checkpoint inhibitors and chimeric antigen receptor T(CAR-T)therapies,thereby advancing personalized treatment paradigms.
基金supported by the Agency for Defense Development Grant Funded by the Korean Government(Grant No.912822501).
文摘Unmanned combat aerial vehicles require lightweight,stealth-capable exhaust systems.However,traditional metallic nozzles increase radar detectability and reduce range,while advanced composites offer high performance but are expensive.Therefore,to improve the operational range and survivability of unmanned combat aerial vehicles,a lightweight,high-temperature-resistant,oxidation-resistant,and low-observable composite exhaust nozzle is developed to replace conventional metallic straight-type nozzles.The nozzle features a double serpentine shape to reduce radar and infrared signatures and is manufactured as a monolithic structure using the filament winding process,accommodating the complex geometry and large size(length:1.8 m,width:0.8 m).The exhaust nozzle consists of a ceramic matrix composite made of silicon carbide fibers and a silicon oxycarbide matrix,which absorbs and scatters radio frequency signals while withstanding prolonged exposure to high-temperature(700℃)oxidizing environments typical of engine exhaust gases.The polysiloxane resin used to produce the silicon oxycarbide matrix poses significant challenges owing to its low tackiness and high viscosity variations depending on the presence of nanoparticles,making filament winding difficult.These challenges are addressed by optimizing resin viscosity and winding pattern design.As a result,the tensile strength of the composite specimens fabricated with the optimized viscosity increases by 228.03% before pyrolysis and 97.68%after pyrolysis,compared with that of the non-optimized specimens.In addition,the density and tensile strength of the composite processed via three cycles of polymer infiltration and pyrolysis increased by 13.08% and 80.37%,respectively,compared to those of the non-densified composite.High-temperature oxidation and flame tests demonstrate exceptional thermal and oxidative stability.Furthermore,when compared with carbon fiber-reinforced ceramic matrix composites,the developed composite exhibits a permittivity at least two levels lower and a reflection loss below7 dB within the frequency range of 9.3-10.9 GHz,underscoring its superior electromagnetic stealth performance.
基金supported by the project SVV-2023-260656 and the Cooperatio Program,research area HEAS.
文摘Background Overtraining Syndrome(OTS)is a condition resulting from excessive physical activity without adequate recovery,predominantly affecting elite athletes and military personnel.While overreaching can be a temporary state,non-functional overreaching may progress to chronic OTS.This review explores various hypotheses regarding the pathogenesis of OTS,including glycogen depletion,dysregulated cytokine response,oxidative stress,and alterations in the autonomic nervous system function.It also highlights the systemic impact of OTS on multiple organ systems,immune function,and overall health,linking the condition to chronic inflammation and an increased disease susceptibility.Additionally,it addresses the role of the gut microbiome in health modulation through physical activity.Methods This narrative review was conducted through a structured search of peer-reviewed journal articles in databases such as PubMed,Web of Science,and Google Scholar,focusing on studies involving human participants and published in English.Results OTS has systemic effects on multiple organ systems,immune function,and overall health,leading to chronic inflammation and increased disease susceptibility.Athletes with OTS exhibit higher morbidity rates,influenced by factors such as sleep deprivation and stress.The review also emphasizes the role of the gut microbiome as a significant modulator of health through physical activity.Conclusion Balanced training and recovery are crucial for preventing OTS and maintaining optimal health and quality of life in physically active individuals.Understanding the complex pathophysiology of OTS is essential for developing effective prevention and treatment strategies.
