Purpose The primary aim of this study was to investigate the acute dose response of 4 different individualized high intensity interval training(HIIT)prescriptions on upright standing postural control.Further,due to th...Purpose The primary aim of this study was to investigate the acute dose response of 4 different individualized high intensity interval training(HIIT)prescriptions on upright standing postural control.Further,due to the similarity between the factors contributing to the change in postural control and fatiguability,the secondary aim of this study was to evaluate the correlation between upright standing postural control and parameters of performance[electromyographic fatigue threshold(EMG_(FT))]and perceived fatiguability[rate of perceived exertion(RPE),motivation,muscle soreness]in endurance athletes.Methods For this purpose,a sample of 40 trained endurance athletes(age:21.47±2.61 years;height:164.77±7.3 cm;weight:57.53±6.3 kg;BMI:21.18±7.4 kg/m^(2))was recruited for the study and randomly allocated into 4 groups.After assessing the demographic,physiological[height,weight,heart rate,blood pressure,maximal oxygen consumption(VO_(2max)),velocity at onset of blood lactate accumulation(vOBLA)]and fatigability parameters,different groups were assigned indi-vidualized HIIT sessions with varied recovery interval intensity and duration in between the pre-and post-postural control assessments.Results All HIIT protocols caused a significant increment in the postural sway in all four directions(front,back,left,and right)which was not significantly different from each other.A strong negative correlation between the change in postural control was reported with VO_(2max),EMG_(FT)and a strong positive correlation with height,weight,body mass index,RPE,while the correlation coefficient revealed a moderate positive correlation with vOBLA.Conclusion This study concludes that all the four HIIT prescriptions have similar acute effect on the upright standing postural control and it is strongly correlated with fatiguability.展开更多
基金supported by the research grant under the Prime Minister Research Fellowship(PMRF)(Scheme code-3268)given by the Ministry of Education,Government of India.The funding agency had no role in the data analysis and interpretation,or the right to approve or disapprove publication of the finished manuscript.
文摘Purpose The primary aim of this study was to investigate the acute dose response of 4 different individualized high intensity interval training(HIIT)prescriptions on upright standing postural control.Further,due to the similarity between the factors contributing to the change in postural control and fatiguability,the secondary aim of this study was to evaluate the correlation between upright standing postural control and parameters of performance[electromyographic fatigue threshold(EMG_(FT))]and perceived fatiguability[rate of perceived exertion(RPE),motivation,muscle soreness]in endurance athletes.Methods For this purpose,a sample of 40 trained endurance athletes(age:21.47±2.61 years;height:164.77±7.3 cm;weight:57.53±6.3 kg;BMI:21.18±7.4 kg/m^(2))was recruited for the study and randomly allocated into 4 groups.After assessing the demographic,physiological[height,weight,heart rate,blood pressure,maximal oxygen consumption(VO_(2max)),velocity at onset of blood lactate accumulation(vOBLA)]and fatigability parameters,different groups were assigned indi-vidualized HIIT sessions with varied recovery interval intensity and duration in between the pre-and post-postural control assessments.Results All HIIT protocols caused a significant increment in the postural sway in all four directions(front,back,left,and right)which was not significantly different from each other.A strong negative correlation between the change in postural control was reported with VO_(2max),EMG_(FT)and a strong positive correlation with height,weight,body mass index,RPE,while the correlation coefficient revealed a moderate positive correlation with vOBLA.Conclusion This study concludes that all the four HIIT prescriptions have similar acute effect on the upright standing postural control and it is strongly correlated with fatiguability.
文摘目的应用表面肌电技术(sEMG)测定分析重复性操作时上肢肌肉的疲劳状态并探讨指标的适宜性。方法8名男性大学生志愿受试者在实验室(以平均40个/min的速度)连续地抓取、移动和放置零件(5 g),每完成80个零件为1个时间段(约2 min),共4组(约8 min)。同时遥测记录肱桡肌、肱二头肌、三角肌、斜方肌的表面肌电信号,采用时域、频域及肌电术振幅频谱联合分析方法(the joint analysis of EMG spectrum and amplitude,JASA)的指标进行分析。结果4块肌肉肌电的最大自主收缩百分比(the percent of maximal voluntary electrical activation,MVE%)随重复性操作时间延长均呈上升趋势(P>0.05)。中位频率(mean frequency,MF)和平均功率频率(mean power frequency,MPF)降低,即所谓频谱左移,只是在最后一两个时段不再下降,反而升高。所测肌肉肌电频率的斜率在第1时段均为负值,在其余3时段则出现时而为负值、时而又为正值的变动,MF和MPF及其斜率的变化趋势一致。JASA分析表明,上肢肌肉在动态作业过程中呈疲劳、恢复和负荷增加的变动。结论在本例重复性操作中,肌肉呈疲劳、恢复、负荷增加或再次疲劳的变化。累及的肌肉主要是斜方肌、三角肌和肱桡肌,肱二头肌次之。肌电指标(如MVE%,MF,MPF及其斜率)在操作过程中的变化可以反映动态劳动的肌肉疲劳,JASA分析证实了这一点。
