目的:探讨少年男篮运动员下肢关节不同角速度等速肌力特征,分析与半蹲跳(SJ)、下蹲跳(CMJ)高度、腾起速度的相关性。方法:Iso Med 2000测试了13名少年男篮运动员双侧髋、膝、踝关节等速肌力(角速度60°/S、240°/S),两台Basel...目的:探讨少年男篮运动员下肢关节不同角速度等速肌力特征,分析与半蹲跳(SJ)、下蹲跳(CMJ)高度、腾起速度的相关性。方法:Iso Med 2000测试了13名少年男篮运动员双侧髋、膝、踝关节等速肌力(角速度60°/S、240°/S),两台Basel高速摄像机记录每名受试者成功的SJ、CMJ过程。结果:1)相比SJ,CMJ的腾起高度(H)、腾空时间(T)、重心腾起初速度(V)均值都非常显著增大(P<0.05);2)随着角速度的增加,受试者髋关节屈和膝关节伸峰力矩均值显著减小(P<0.05)。不同角速度测试中髋、膝和踝关节屈伸比值分别为和0.72、0.68、0.21(60°/S)和0.7、0.64、0.21(240°/S);3)影响CMJ的等速测试为髋关节屈伸绝对力量和爆发力、膝和踝关节伸的爆发力;影响SJ的等速测试为髋关节、踝关节伸的爆发力。结论:少年男篮应优先发展髋关节的爆发力和绝对力量练习,维持膝关节前后肌群的平衡,加强踝关节的稳定性,进而降低下肢伤病的风险。展开更多
Purpose This cross-sectional study investigated dynamic force-time variables and vaulting performance in young female gymnasts of different maturity status.Methods 120 gymnasts aged 5-14 years were sub-divided into ma...Purpose This cross-sectional study investigated dynamic force-time variables and vaulting performance in young female gymnasts of different maturity status.Methods 120 gymnasts aged 5-14 years were sub-divided into maturity groupings using percent of predicted adult height(%PAH)attained.Participants performed three jumping protocols,the squat jump(SJ),countermovement jump(CMJ)and drop jump(DJ),before completing straight jump vaults that were recorded using two-dimensional video.Results Jumping performance improved with biological maturity evidenced by the most mature gymnasts’producing sig-nificantly more absolute force(P<0.05;all d>0.78),impulse(P<0.05;all d>0.75)and power(P<0.05;all d>0.91)than the least mature group,resulting in the greater jump heights(P<0.05;all d>0.70).While,no significant differences were observed in relative peak force across multiple tests,measures of relative peak power did significantly increase with maturity.Based upon regression analyses,maturation was found to influence vertical take-off velocity during vaulting,explaining 41%of the variance in each jumping protocol.Across all tests,the DJ was found to have the highest predictive ability of vaulting vertical take-off velocity,explaining 55%of the total variance.Conclusion Biological maturation impacts jump height and underpinning mechanical variables in young female gymnasts.Vaulting vertical take-off velocity appears to be influenced by maturation and various dynamic force-time variables,par-ticularly those during DJ,which had the highest explained total variance.展开更多
The aim of the present study was to investigate the effects of hip thrust （HT） training on the strength and power performance of lower extremities. In total, 20 male collegiate baseball players participated in this ...The aim of the present study was to investigate the effects of hip thrust （HT） training on the strength and power performance of lower extremities. In total, 20 male collegiate baseball players participated in this study and were divided into a HT training group （HTT） and a control group （CON）. Participants in the HTT group added HTT movements to a regular baseball training regimen （3 times per week for 8 weeks）, whereas participants in the CON group only performed the regular baseball training regimen. Before and after the training sessions, strength performance was assessed via tests of squat strength and 3 repetition maximum （3RM） HT strength; power performance was assessed via vertical jump height, standing long jump distance, and 30-m sprint time. The results indicated significant improvement in squat strength （31% ± 15%） and 3RM HT strength （36% ± 16%） （P 〈 0.05）, but not in vertical jump height, standing long jump distance, and 30-m sprint time. Furthermore, the improvement in squat strength highly correlated with 3RM HT strength （r = 0.83, P 〈 0.05）, In conclusion, HTT plays a role in developing squat strength but does not appear to improve power performance.展开更多
文摘目的:探讨少年男篮运动员下肢关节不同角速度等速肌力特征,分析与半蹲跳(SJ)、下蹲跳(CMJ)高度、腾起速度的相关性。方法:Iso Med 2000测试了13名少年男篮运动员双侧髋、膝、踝关节等速肌力(角速度60°/S、240°/S),两台Basel高速摄像机记录每名受试者成功的SJ、CMJ过程。结果:1)相比SJ,CMJ的腾起高度(H)、腾空时间(T)、重心腾起初速度(V)均值都非常显著增大(P<0.05);2)随着角速度的增加,受试者髋关节屈和膝关节伸峰力矩均值显著减小(P<0.05)。不同角速度测试中髋、膝和踝关节屈伸比值分别为和0.72、0.68、0.21(60°/S)和0.7、0.64、0.21(240°/S);3)影响CMJ的等速测试为髋关节屈伸绝对力量和爆发力、膝和踝关节伸的爆发力;影响SJ的等速测试为髋关节、踝关节伸的爆发力。结论:少年男篮应优先发展髋关节的爆发力和绝对力量练习,维持膝关节前后肌群的平衡,加强踝关节的稳定性,进而降低下肢伤病的风险。
文摘Purpose This cross-sectional study investigated dynamic force-time variables and vaulting performance in young female gymnasts of different maturity status.Methods 120 gymnasts aged 5-14 years were sub-divided into maturity groupings using percent of predicted adult height(%PAH)attained.Participants performed three jumping protocols,the squat jump(SJ),countermovement jump(CMJ)and drop jump(DJ),before completing straight jump vaults that were recorded using two-dimensional video.Results Jumping performance improved with biological maturity evidenced by the most mature gymnasts’producing sig-nificantly more absolute force(P<0.05;all d>0.78),impulse(P<0.05;all d>0.75)and power(P<0.05;all d>0.91)than the least mature group,resulting in the greater jump heights(P<0.05;all d>0.70).While,no significant differences were observed in relative peak force across multiple tests,measures of relative peak power did significantly increase with maturity.Based upon regression analyses,maturation was found to influence vertical take-off velocity during vaulting,explaining 41%of the variance in each jumping protocol.Across all tests,the DJ was found to have the highest predictive ability of vaulting vertical take-off velocity,explaining 55%of the total variance.Conclusion Biological maturation impacts jump height and underpinning mechanical variables in young female gymnasts.Vaulting vertical take-off velocity appears to be influenced by maturation and various dynamic force-time variables,par-ticularly those during DJ,which had the highest explained total variance.
文摘The aim of the present study was to investigate the effects of hip thrust （HT） training on the strength and power performance of lower extremities. In total, 20 male collegiate baseball players participated in this study and were divided into a HT training group （HTT） and a control group （CON）. Participants in the HTT group added HTT movements to a regular baseball training regimen （3 times per week for 8 weeks）, whereas participants in the CON group only performed the regular baseball training regimen. Before and after the training sessions, strength performance was assessed via tests of squat strength and 3 repetition maximum （3RM） HT strength; power performance was assessed via vertical jump height, standing long jump distance, and 30-m sprint time. The results indicated significant improvement in squat strength （31% ± 15%） and 3RM HT strength （36% ± 16%） （P 〈 0.05）, but not in vertical jump height, standing long jump distance, and 30-m sprint time. Furthermore, the improvement in squat strength highly correlated with 3RM HT strength （r = 0.83, P 〈 0.05）, In conclusion, HTT plays a role in developing squat strength but does not appear to improve power performance.
