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首页> 外文期刊>Journal of Neurophysiology >Contribution of afferent feedback to the soleus muscle activity during human locomotion.
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Contribution of afferent feedback to the soleus muscle activity during human locomotion.

机译：在人类运动过程中比目鱼肌活动传入反馈的贡献。

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During the stance phase of the human step cycle, the ankle undergoes a natural dorsiflexion that stretches the soleus muscle. The afferent feedback resulting from this stretch enhances the locomotor drive. In this study a robotic actuator was used to slightly enhance or reduce the natural ankle dorsiflexion, in essence, mimicking the small variations in the ankle dorsiflexion movement that take place during the stance phase of the step cycle. The soleus (SOL) and tibialis anterior EMG were analyzed in response to the ankle trajectory modifications. The dorsiflexion enhancements and reductions generated gradual increments and decrements, respectively, in the ongoing SOL EMG. We exercised care to ensure that the imposed ankle movements were too slow to elicit distinct burst-like stretch reflex responses that have been investigated previously. The increased SOL EMG after the dorsiflexion enhancements was reduced when the group Ia afferents were blocked with peripheral ischemia at the thigh, and during high-frequency Achilles tendon vibration. However, neither ischemia nor tendon vibration affected the decrements in the SOL EMG during the dorsiflexion reductions. These findings give evidence of the contribution of afferent feedback to the SOL activity in an ongoing basis during the stance phase. The results suggest that mainly feedback from the group Ia pathways is responsible for the increments in the SOL EMG during the dorsiflexion enhancements. However, the decrements in the SOL activity might be mediated by different afferent mechanisms.
机译：在人类步态周期的站立阶段，脚踝会经受自然的背屈，从而伸展比目鱼肌。由该拉伸产生的传入反馈增强了运动驱动。在这项研究中，使用了一个机器人执行器来稍微增强或减少自然的踝背屈，实质上是模仿了在脚步周期的站立阶段中踝背屈运动的微小变化。分析比目鱼肌（SOL）和胫骨前肌电图以响应踝关节轨迹的变化。在进行中的SOL EMG中，背屈增强和减小分别产生了逐渐的增加和减少。我们采取了谨慎措施，以确保所施加的踝关节运动太慢，以至于无法引起先前已经研究过的独特的爆发样拉伸反射反应。背屈增强后增加的SOL EMG在大腿周围周围缺血和高频跟腱振动期间被Ia组传入神经阻滞时减少。但是，在背屈减少过程中，缺血或肌腱振动均不会影响SOL EMG的减少。这些发现提供了立场阶段持续进行的传入反馈对SOL活动的贡献的证据。结果表明主要来自Ia组通路的反馈负责背屈增强过程中SOL EMG的增加。但是，SOL活性的下降可能由不同的传入机制介导。

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