Purpose:The purpose of this study was to examine the reliability and the learning effect of an isokinetic trunk flexion-extension protocol designed to simultaneously assess trunk muscle strength and endurance.In addit...Purpose:The purpose of this study was to examine the reliability and the learning effect of an isokinetic trunk flexion-extension protocol designed to simultaneously assess trunk muscle strength and endurance.In addition,the effect of the participants’sex on the reliability data was examined.Methods:Fifty-seven healthy and physically active young men(n=28)and women(n=29)performed the isokinetic protocol 5 times,separated by a week between each of the first 4 sessions and by a month between the last 2 sessions.The protocol consisted of performing 4 trials of 15 maximum flexion-extension concentric exertions at 120°/s(range of trunk motion=50°).The absolute and relative peak torque and total work were calculated to assess trunk flexion and extension strength.In addition,endurance ratio,modified endurance ratio,fatigue final ratio,recovery ratio,and modified recovery ratio variables were used for the assessment of trunk muscle endurance in both directions.Results:Regarding the absolute reliability,no relevant changes were found between paired-comparison sessions for most strength and endurance variables,except for total work and relative total work variables in the flexion movement in both sexes.In addition,the typical error of the isokinetic variables was lower than 10%in both males and females,and minimum detectable changes ranged from 7%to 20%,with a tendency to be higher in females and in endurance variables.The strength variables showed high-to-excellent intraclass correlation coefficients(ICCs;>0.74);however,for the endurance variables only the endurance ratio and the modified endurance ratio obtained moderate-to-high ICC values(0.57<ICC<0.82).In addition,the analysis of the variance reported no significant differences between consecutive pairs of sessions for most variables in both sexes.Conclusion:Overall,these findings provide clinicians,trainers,and researchers with a 10-min single-session protocol to perform a reliable muscle strength and endurance evaluation of trunk flexor and extensor muscles,all within the same protocol.展开更多
BACKGROUND Ankle normative values are limited compared to isokinetic knee assessments.Chronic ankle instability correlates with agonist-antagonist imbalances,decreased evertor/invertor ratio,and plantar flexion defici...BACKGROUND Ankle normative values are limited compared to isokinetic knee assessments.Chronic ankle instability correlates with agonist-antagonist imbalances,decreased evertor/invertor ratio,and plantar flexion deficits.Strengthening programs targeting evertor/invertor and dorsiflexor/plantar flexor balance help reduce injury recurrence.Bilateral neuromuscular deficits compromise the contralateral side,rendering healthy limbs unsuitable as recovery references.Defining normative healthy ankle parameters is crucial for establishing precise limits in nonsurgical treatments and sports return criteria.While the limb symmetry index(LSI)is used for knees with a cutoff of>90%,no such standardization exists for the ankle.AIM To comprehensively evaluate isokinetic ankle strength profiles in non-athletic individuals.METHODS This is a cross-sectional study.Two hundred ankles were evaluated using the Biodex 3 System to assess eversion,inversion,dorsiflexion,and plantar flexion.Healthy individuals with an active lifestyle and no previous injuries were evaluated.The Maximum Torque,Agonist/Antagonist Ratio,LSI,and Muscular Deficiency Index(MDI)and the correlation with demographic variables were evaluated.RESULTS The mean age(mean±SD)was 38.5±13.5 years,and the body mass index(BMI)was 25.8±4.2 in 69 men and 31 women.The mean maximum torque values by gender were(mean±SD):22.3±6.6 female(F)and 33.4±9.9 male(M)N/m for eversion;30.10±10.0(F)and 37.0±11.6 N/m(M)for inversion,37.4±10.0(F)and 53.6±13.0 N/m(M)for dorsiflexion,and 100.4±37.2(F)and 158.1±33.4(M)N/m for flexion.There was no correlation between age or BMI and maximum torque.The evertors/invertors ratio was 88.8%,and the dorsiflexors/plantar flexors ratio was 36.1%.The MDI and LSI were balanced between sides for every movement,having an average global difference of less than 10%.CONCLUSION These findings provide gender-specific normative isokinetic values for the ankle in healthy,physically active adults.These reference parameters—especially LSI and MDI above 90%—can support clinical decision-making in rehabilitation planning and return-to-sport assessment,offering objective benchmarks for functional recovery.展开更多
基金the financial support of Ministerio de Ciencia e Innovación(DEP2010-16493)Generalitat Valenciana(ACOMP/2011/130)+1 种基金Spain.Casto Juan-Recio and Alejandro López-Valenciano were supported by predoctoral grants given by Generalitat Valenciana(Val i+d)(ACOMP/2011/130)Ministerio de Educacion,Cultura y Deporte(FPU)(DEP2010-16493)。
文摘Purpose:The purpose of this study was to examine the reliability and the learning effect of an isokinetic trunk flexion-extension protocol designed to simultaneously assess trunk muscle strength and endurance.In addition,the effect of the participants’sex on the reliability data was examined.Methods:Fifty-seven healthy and physically active young men(n=28)and women(n=29)performed the isokinetic protocol 5 times,separated by a week between each of the first 4 sessions and by a month between the last 2 sessions.The protocol consisted of performing 4 trials of 15 maximum flexion-extension concentric exertions at 120°/s(range of trunk motion=50°).The absolute and relative peak torque and total work were calculated to assess trunk flexion and extension strength.In addition,endurance ratio,modified endurance ratio,fatigue final ratio,recovery ratio,and modified recovery ratio variables were used for the assessment of trunk muscle endurance in both directions.Results:Regarding the absolute reliability,no relevant changes were found between paired-comparison sessions for most strength and endurance variables,except for total work and relative total work variables in the flexion movement in both sexes.In addition,the typical error of the isokinetic variables was lower than 10%in both males and females,and minimum detectable changes ranged from 7%to 20%,with a tendency to be higher in females and in endurance variables.The strength variables showed high-to-excellent intraclass correlation coefficients(ICCs;>0.74);however,for the endurance variables only the endurance ratio and the modified endurance ratio obtained moderate-to-high ICC values(0.57<ICC<0.82).In addition,the analysis of the variance reported no significant differences between consecutive pairs of sessions for most variables in both sexes.Conclusion:Overall,these findings provide clinicians,trainers,and researchers with a 10-min single-session protocol to perform a reliable muscle strength and endurance evaluation of trunk flexor and extensor muscles,all within the same protocol.
文摘BACKGROUND Ankle normative values are limited compared to isokinetic knee assessments.Chronic ankle instability correlates with agonist-antagonist imbalances,decreased evertor/invertor ratio,and plantar flexion deficits.Strengthening programs targeting evertor/invertor and dorsiflexor/plantar flexor balance help reduce injury recurrence.Bilateral neuromuscular deficits compromise the contralateral side,rendering healthy limbs unsuitable as recovery references.Defining normative healthy ankle parameters is crucial for establishing precise limits in nonsurgical treatments and sports return criteria.While the limb symmetry index(LSI)is used for knees with a cutoff of>90%,no such standardization exists for the ankle.AIM To comprehensively evaluate isokinetic ankle strength profiles in non-athletic individuals.METHODS This is a cross-sectional study.Two hundred ankles were evaluated using the Biodex 3 System to assess eversion,inversion,dorsiflexion,and plantar flexion.Healthy individuals with an active lifestyle and no previous injuries were evaluated.The Maximum Torque,Agonist/Antagonist Ratio,LSI,and Muscular Deficiency Index(MDI)and the correlation with demographic variables were evaluated.RESULTS The mean age(mean±SD)was 38.5±13.5 years,and the body mass index(BMI)was 25.8±4.2 in 69 men and 31 women.The mean maximum torque values by gender were(mean±SD):22.3±6.6 female(F)and 33.4±9.9 male(M)N/m for eversion;30.10±10.0(F)and 37.0±11.6 N/m(M)for inversion,37.4±10.0(F)and 53.6±13.0 N/m(M)for dorsiflexion,and 100.4±37.2(F)and 158.1±33.4(M)N/m for flexion.There was no correlation between age or BMI and maximum torque.The evertors/invertors ratio was 88.8%,and the dorsiflexors/plantar flexors ratio was 36.1%.The MDI and LSI were balanced between sides for every movement,having an average global difference of less than 10%.CONCLUSION These findings provide gender-specific normative isokinetic values for the ankle in healthy,physically active adults.These reference parameters—especially LSI and MDI above 90%—can support clinical decision-making in rehabilitation planning and return-to-sport assessment,offering objective benchmarks for functional recovery.
