Rossi A, Rossi B, Santarcangelo E
Arch Ital Biol. 1985 Nov;123(4):241-53.
The effects of neck vibration were studied in ten healthy subjects standing in unrestrained or restrained conditions. An involuntary slow and gradual displacement of the body axis associated with a subjective experience of forward tilt occurred during vibration of the dorsal surface of the neck. This effect was associated with a decreased tonic contration of the antigravitary lower limb musculature. The amplitude of the H-reflex from the soleus muscle, recorded at progressively increasing time interval after the onset of the vibratory stimulus, showed complex interactions: in particular, in unrestrained conditions an early inhibitory phase occurred at about 100 msec, followed by a short-lasting facilitatory phase between 150-300 msec and by a late long-lasting excitatory component which started 500-600 msec after the onset of vibratory stimulus. In restrained subjects, the late excitatory phase disappeared and was substituted by a delayed depression. In this instance, the short-lasting facilitatory phase appeared to be superimposed on a background of inhibition. The effects produced by the neck input on the H-reflex were attenuated during vibration of the dorsal muscolature at L4-L5. The mechanisms involved in the cervical control of posture and reflex movements following neck vibration are discussed.
在10名处于无约束或受约束状态下站立的健康受试者中研究了颈部振动的影响。在颈部背侧振动期间，身体轴线出现了与前倾主观感受相关的非自主性缓慢且逐渐的位移。这种效应与抗重力下肢肌肉组织的紧张性收缩减少有关。在振动刺激开始后，以逐渐增加的时间间隔记录的比目鱼肌H反射的幅度显示出复杂的相互作用：特别是在无约束状态下，约100毫秒时出现早期抑制相，随后在150 - 300毫秒之间出现短暂的易化相，并在振动刺激开始后500 - 600毫秒出现晚期持久的兴奋成分。在受约束的受试者中，晚期兴奋相消失，取而代之的是延迟性抑制。在这种情况下，短暂的易化相似乎叠加在抑制背景上。在L4 - L5背侧肌肉组织振动期间，颈部输入对H反射产生的效应减弱。讨论了颈部振动后颈部对姿势和反射运动控制所涉及的机制。
