Gurfinkel V S, Levik Y S, Kazennikov O V, Selionov V A
Laboratory of Neurobiology of Motor Control, Institute for Information Transmission Problems, Russian Academy of Sciences, Moscow, Russia.
Eur J Neurosci. 1998 May;10(5):1608-12. doi: 10.1046/j.1460-9568.1998.00179.x.
We attempted to elicit automatic stepping in healthy humans using appropriate afferent stimulation. It was found that continuous leg muscle vibration produced rhythmic locomotor-like stepping movements of the suspended leg, persisting up to the end of stimulation and sometimes outlasting it by a few cycles. Air-stepping elicited by vibration did not differ from the intentional stepping under the same conditions, and involved movements in hip and knee joints with reciprocal electromyogram (EMG) bursts in corresponding flexor and extensor muscles. The phase shift between evoked hip and knee movements could be positive or negative, corresponding to 'backward' or 'forward' locomotion. Such an essential feature of natural human locomotion as alternating movements of two legs, was also present in vibratory-evoked leg movements under appropriate conditions. It is suggested that vibration evokes locomotor-like movements because vibratory-induced afferent input sets into active state the central structures responsible for stepping generation.
我们试图通过适当的传入刺激在健康人类中诱发自动踏步。结果发现，持续的腿部肌肉振动会使悬空腿产生有节奏的类似行走的踏步运动，这种运动一直持续到刺激结束，有时还会比刺激多持续几个周期。由振动诱发的空中踏步与相同条件下的有意踏步并无差异，且涉及髋关节和膝关节的运动，相应的屈肌和伸肌会出现相互交替的肌电图（EMG）爆发。诱发的髋关节和膝关节运动之间的相位偏移可能为正或负，分别对应“向后”或“向前”的运动。在适当条件下，振动诱发的腿部运动中也存在自然人类行走的一个基本特征，即双腿交替运动。有人提出，振动会诱发类似行走的运动，是因为振动诱发的传入输入使负责产生踏步的中枢结构进入活跃状态。
