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首页> 美国卫生研究院文献>Journal of Neurophysiology >Long-latency reflexes of elbow and shoulder muscles suggest reciprocal excitation of flexors reciprocal excitation of extensors and reciprocal inhibition between flexors and extensors
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Long-latency reflexes of elbow and shoulder muscles suggest reciprocal excitation of flexors reciprocal excitation of extensors and reciprocal inhibition between flexors and extensors

机译：肘部和肩部肌肉的长时延反射提示屈肌的相互激励伸肌的相互激励以及屈肌和伸肌之间的相互抑制

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摘要

Postural corrections of the upper limb are required in tasks ranging from handling an umbrella in the changing wind to securing a wriggling baby. One complication in this process is the mechanical interaction between the different segments of the arm where torque applied at one joint induces motion at multiple joints. Previous studies have shown the long-latency reflexes of shoulder muscles (50–100 ms after a limb perturbation) account for these mechanical interactions by integrating information about motion of both the shoulder and elbow. It is less clear whether long-latency reflexes of elbow muscles exhibit a similar capability and what is the relation between the responses of shoulder and elbow muscles. The present study utilized joint-based loads tailored to the subjects' arm dynamics to induce well-controlled displacements of their shoulder and elbow. Our results demonstrate that the long-latency reflexes of shoulder and elbow muscles integrate motion from both joints: the shoulder and elbow flexors respond to extension at both joints, whereas the shoulder and elbow extensors respond to flexion at both joints. This general pattern accounts for the inherent flexion-extension coupling of the two joints arising from the arm's intersegmental dynamics and is consistent with spindle-based reciprocal excitation of shoulder and elbow flexors, reciprocal excitation of shoulder and elbow extensors, and across-joint inhibition between the flexors and extensors.
机译：上肢的姿势校正在从变风中拿起雨伞到固定婴儿时都需要进行。该过程中的一个复杂之处是手臂不同部分之间的机械相互作用，其中在一个关节处施加的扭矩会在多个关节处引起运动。以前的研究表明，肩部肌肉的长时延反射（肢体摄动后50-100毫秒）通过整合有关肩部和肘部运动的信息来解释这些机械相互作用。尚不清楚肘部肌肉的长时延反射是否表现出类似的功能，以及肩部和肘部肌肉的反应之间的关系是什么。本研究利用了针对受试者的手臂动力学量身定制的基于关节的负荷，以诱导受控制的肩膀和肘部位移。我们的结果表明，肩部和肘部肌肉的长时延反射整合了两个关节的运动：肩部和肘部屈肌对两个关节的伸展均做出反应，而肩部和肘部伸肌对两个关节的屈曲做出响应。这种一般模式说明了臂间节间动力学引起的两个关节固有的屈伸耦合，并且与基于主轴的肩膀和肘部屈肌的往复激励，肩膀和肘部伸肌的往复激励以及跨关节之间的跨关节抑制相一致。屈肌和伸肌。

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