青年男性膝关节等速向心测力研究

Isokinetic Concentric Dynamometry of Knee Flexors and Extensors in Young Male

目的研究绳肌和股四头肌在不同测试速度下其肌力各指标的变化规律 ,同时为力量素质的评价提供正常值参考。方法利用REV90 0 0等速测力及康复系统对 30名健康男性双侧膝关节的等速向心收缩数据进行测试。结果峰力矩 (PT)及相对峰力矩 (PT/BW )均表现为股四头肌大于绳肌 ,慢速大于快速 ;惯用肢与非惯用肢峰力矩的差异 (Di)在 1 0 %左右 ;到达峰力矩的时间 (TPT)随测试速度增加而显著缩短 ;股四头肌和绳肌峰力矩角 (APT)分别为 50°～ 70°、32°～ 45°。绳肌与股四头肌峰力矩比率 (H/Q)在 50 %～ 60 %之间 ;耐力指数 (WF)在 65%左右。结论此结果为中国航天医学和生理学特别是模拟失重或微重力条件下的肌肉功能评定提供了一个新的思路。

Objective To investigate the effects of different moving speeds on isokinetic dynamometry of knee flexors and extensors, and to provide normative data for comparative purposes in strength evaluations. Method Thirty healthy male were tested at 60,180,and 240 deg/sec angular velocities using a REV9000 testing and rehabilitation system. Result Both PT(peak torque) and PT/BW(peak torque/body weights) showed significant differences(P<0.01,P<0.05) between flexors and extensors ,and declined significantly with increased speed(P<0.001).Peak torque differences between dominant and nodominant knee(Di%) was 10%. TPT(time to peak torque) tended to decrease as moving speeds increased(P<0.001). APT(angle of peak torque) were 50%～70% for quadriceps、and 32%～45% for hamstrings; H/Q(hamstrings peak torque/quadriceps peak torque) was 50%～60%; WF(work fatigue) was 65%. Conclusion The results provided a reference for strength evaluations in space medicine and space physiology,especially under simulated weightlessness and microgravity.