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首页> 外文期刊>The European Journal of Neuroscience >Plantar flexor stretch reflex responses to whole body loading/unloading during human walking.
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Plantar flexor stretch reflex responses to whole body loading/unloading during human walking.

机译：足底屈肌舒展反射对人体行走过程中全身负荷的反应。

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Numerous animal and human studies have shown that afferent information from the periphery contributes to the control of walking. In particular, recent studies have consistently shown that load receptor input is an important element of the locomotion control mechanism. The objective of this study was to investigate the contribution of load receptor feedback to the compensatory stretch reflex response. We examined the contribution of load receptor feedback to the magnitude of the short and medium latency components of the ankle plantar flexor stretch reflex responses following an unexpected dorsiflexion perturbation during human walking. Three body load conditions were investigated: normal body load, a 30% increase in body load, and a 30% decrease in body load. Healthy subjects walked on a treadmill at approximately 3.6 km/h with the left ankle attached to a portable stretching device. Dorsiflexion perturbations (8 degrees; 350-425 degrees/s) were generated during the late stance phase of gate (approximately 400 ms following heel contact). Electromyographic activity was recorded from the soleus, tibialis anterior, medial gastrocnemius, rectus femoris, and biceps femoris muscles using bipolar surface electrodes. Stretch reflex responses were observed in the soleus and gastrocnemius muscles for all of the body load conditions; however, increasing or decreasing the body load did not affect the timing and magnitude of the responses. This study provides evidence that load receptor input does not contribute strongly to the corrective response of the stretch reflex in the plantar flexor muscles during walking.
机译：大量的动物和人类研究表明，周围的传入信息有助于控制步行。特别是，最近的研究一致地表明，负荷接收器输入是运动控制机制的重要组成部分。这项研究的目的是调查负荷受体反馈对代偿性拉伸反射反应的贡献。我们检查了负荷感受器反馈对人类步行过程中出现意外背屈扰动后踝flex屈拉伸反射反应的中短潜伏期分量的影响。研究了三种身体负荷状况：正常身体负荷，身体负荷增加30％和身体负荷减少30％。健康受试者在跑步机上以大约3.6 km / h的速度行走，左脚踝连接到便携式拉伸设备上。在门的后期站立阶段（足跟接触后约400 ms）产生背屈摄动（8度; 350-425度/ s）。使用双极表面电极记录了比目鱼肌，胫前肌，腓肠肌内侧，股直肌和股二头肌的肌电活动。在所有身体负荷情况下，在比目鱼肌和腓肠肌中观察到了拉伸反射反应。但是，增加或减少身体负荷不会影响反应的时机和幅度。这项研究提供的证据表明，负荷感受器的输入对步行过程中the屈肌的拉伸反射的矫正反应没有很大的作用。

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