Belanger M, Patla A E
Neural Control Laboratory, Department of Kinesiology, University of Waterloo, Waterloo, Ontario, Canada N2L 3G1.
J Mot Behav. 1987 Dec;19(4):434-53. doi: 10.1080/00222895.1987.10735423.
The interaction between the peripheral and the central regulation of locomotion was studied by examining the dependency of the response to unexpected perturbation on the phase of the step cycle. The changes in the latency and magnitude of various muscle responses to electrical stimulation of the toe and applied unexpectedly at different phases of the locomotor cycle in humans are described. The results show that response to perturbation is gated and modulated in both ipsi- and contralateral limb muscles. These muscle responses, when present, were always excitatory in nature. They were not correlated with the normal locomotor activity, thus suggesting a more complex organization of the response. Except for one muscle in the contralateral limb, the latency of the other muscle responses did not vary across the step cycle. in response to the perturbation, the appropriate phase of the step cycle was shortened. The results from this study suggest that the perturbation applied elicits a phase-independent, normal ipsilateral flexor response in the tibialis anterior muscle, while the gating and modulation of other ipsi- and contralateral muscles provide appropriate phase-dependent adaptive response to maintain postural stability and continue with the ongoing task of locomotion.
通过研究对意外扰动的反应对步周期相位的依赖性，来探讨运动的外周调节与中枢调节之间的相互作用。本文描述了在人类运动周期的不同阶段，对脚趾进行意外电刺激时，各种肌肉反应的潜伏期和幅度变化。结果表明，同侧和对侧肢体肌肉对扰动的反应都受到门控和调制。这些肌肉反应一旦出现，本质上总是兴奋性的。它们与正常的运动活动无关，因此表明反应的组织更为复杂。除了对侧肢体的一块肌肉外，其他肌肉反应的潜伏期在整个步周期中没有变化。对扰动的反应使步周期的相应阶段缩短。本研究结果表明，施加的扰动会在胫骨前肌中引发与相位无关的正常同侧屈肌反应，而同侧和对侧其他肌肉的门控和调制则提供了与相位相关的适当适应性反应，以维持姿势稳定性并继续进行正在进行的运动任务。
