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首页> 外文期刊>Journal of electromyography and kinesiology: Official journal of the International Society of Electrophysiological Kinesiology >Superimposing hip extension on knee flexion evokes higher activation in biceps femoris than knee flexion alone
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Superimposing hip extension on knee flexion evokes higher activation in biceps femoris than knee flexion alone

机译：膝关节屈曲的叠加髋部延伸唤起二头肌股骨的激活比单独的膝关节屈曲

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摘要

Hamstring muscle function during knee flexion has been linked to hamstring injury and performance. However, it is unclear whether knee flexion alone (KF) requires similar hamstring electromyography (EMG) activity pattern to simultaneous hip extension and knee flexion (HE-KF), a combination that occurs in the late swing phase of sprinting. This study examined whether HE-KF maximal voluntary isometric contraction (MVIC) evokes higher (EMG) activity in biceps femoris long head (BFlh) and semitendinosus (ST) than KF alone. Effects of shank rotation angles were also tested. Twenty-one males performed the above-mentioned MVICs while EMG activity was measured along ST and BFlh. Conditions were compared using a one-way mixed functional ANOVA model under a fully Bayesian framework. Higher EMG activity was found in HE-KF in all shank rotation positions than in KF in the middle region of BFlh (highest in the 9th channel, by 0.022 mV [95%CrI 0.014 to 0.030] in neutral shank position). For ST, this was only observed in the neutral shank position and in the most proximal channel (by 0.013 mV [95%CrI 0.001 to 0.025]). We observed muscle- and region-specific responses to HE-KF. Future studies should examine whether hamstring activation in this task is related to injury risk and sprint performance.
机译：膝关节屈曲时的腘绳肌功能与腘绳肌损伤和性能有关。然而，目前尚不清楚单膝关节屈曲（KF）是否需要与同时髋关节伸展和膝关节屈曲（HE-KF）类似的腘绳肌肌电图（EMG）活动模式，后者发生在短跑摆动后期。本研究考察了HE-KF最大自主等长收缩（MVIC）是否比单独使用KF在股二头肌长头（BFlh）和半腱肌（ST）中引起更高的（EMG）活动。还测试了柄旋转角度的影响。21只雄性进行上述MVIC，同时沿着ST和BFlh测量肌电活动。在完全贝叶斯框架下，使用单向混合函数ANOVA模型对条件进行比较。HE-KF在所有小腿旋转位置均高于BFLH的中间区域KF（在第九个通道中最高，0.022个MV（95% CRI 0.014至0.030）在中性小腿位置）。对于ST，仅在中性小腿位置和最近端通道（0.013 mV[95%CrI 0.001至0.025]）观察到这种情况。我们观察了肌肉和区域对HE-KF的特异性反应。未来的研究应该检查这项任务中的腘绳肌激活是否与受伤风险和短跑成绩有关。

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