肌肉振动对肢体制动引起的神经传导功能改变的影响

摘要

Objective:To determine peripheral neural adaptations to 2-week immobilization and whether muscle vibration intervention during immobilization would attenuate the negative adaptations induced by immobilization.Methods:Twenty-four subjects with one hind limb immobilized by plaster were divided into the immobilization group and the immobilization with muscle vibration group.Mechanical vibrations with constant low amplitude (0.3 mm) were applied with a constant frequency of 100 Hz on the soleus muscle of the subjects in vibration group during the immobilization period.The conduction velocity of tibial nerve and the latencies of M wave and H-reflex of soleus were observed before and after 2-week immobilization.Results:After 2 weeks of immobilization, conduction velocity of tibial nerve did not change with immobilization in either group (P>0.05).Significant increases in latency of M wave (P=0.000) and H wave (P=0.000) were found in the immobilization group, but no changes were observed in conduction through the spinal reflex loop (H minus M-wave latencies) (P=0.256).No significant changes occurred in the immobilization with muscle vibration group.Conclusion:These findings suggest that limb immobilization induces plastic changes in peripheral neural function, as evidenced by the increases in M-wave and H reflex latency and that such alterations was prevented by the intervention of muscle vibration during the immobilization period.%目的:观察制动及制动期间施加肌肉振动对肢体神经传导功能的影响.方法:选择骨折后石膏固定的一侧肢体制动患者24例,检测其制动前后胫神经传导速度、M波和H反射的潜伏期.结果:制动2周后,胫神经传导速度无明显改变(P>0.05),M波潜伏期和H反射潜伏期明显延长(P<0.05);制动期间给予肌肉振动,M波潜伏期和H反射潜伏期无明显改变(P>0.05).结论:制动引起外周神经传导功能减慢,制动期间给予肌肉振动,能够对抗制动引起的外周神经功能的改变.