Enoka R M, Hutton R S, Eldred E
Electroencephalogr Clin Neurophysiol. 1980 Jun;48(6):664-72. doi: 10.1016/0013-4694(80)90423-x.
The effects on the Hoffmann reflex and tendon tap responses in the human soleus and medial gastrocnemius muscles of a brief conditioning volitional contraction have been compared with the objective of distinguishing contributions from the central nervous system and the periphery. The H-wave on successive trials over a 50 sec period following contraction for the most part demonstrated a depression, especially upon the initial trial. The T-wave responses in the first few trials were greater than those in the control period. Using the assumption that responses to tendon taps had been reduced by the amounts reflected in the excitability curve for H-response, it was deducted that a marked enhancement in T-wave excitability had been present at the initial tendon tap and more moderate facilitation thereafter. This is consistent with the post-contraction discharge and increase in stretch sensitivity of spindle receptors seen after contraction of a muscle in experimental animals. It is concluded that such effects on spindles may occur in man, maybe of such force as to detectably influence dynamic movements.
为了区分中枢神经系统和外周的作用，对人类比目鱼肌和腓肠肌进行短暂的条件性随意收缩，比较其对霍夫曼反射和腱反射反应的影响。收缩后50秒内连续试验的H波在很大程度上表现为抑制，尤其是在初次试验时。最初几次试验中的T波反应大于对照期。假设腱反射的反应已按H反应兴奋性曲线所示的量减少，则推断在初次腱反射时T波兴奋性有明显增强，此后有较适度的易化。这与实验动物肌肉收缩后所见的梭形感受器收缩后放电及伸展敏感性增加相一致。得出的结论是，这种对肌梭的影响可能发生在人类身上，其强度可能足以对动态运动产生可检测到的影响。
