Greenwood R, Hopkins A
J Neurol Neurosurg Psychiatry. 1977 May;40(5):448-54. doi: 10.1136/jnnp.40.5.448.
We have examined peripheral proprioceptive input during fall in man. The first 80 ms of unexpected free fall, both in a parachute harness and while seated, has been studied using the monosynaptic Hoffman (H) and Achilles tendon (T) reflexes. Facilitation of the H reflex begins about 30 to 40 ms after release, representing the onset of motor neurone facilitation before the electromyographic activity which begins about 80 ms after release. Earlier facilitation of the T reflex may represent spindle excitation due to change in muscle shape as suggested by Matthews and Whiteside (1960), but the T reflex inhibition described by these authors after 50 ms of seated fall is probably a purely mechanical phenomenon.
我们已经研究了人体跌倒过程中的外周本体感觉输入。使用单突触霍夫曼（H）反射和跟腱（T）反射，对在降落伞背带中以及坐着时意外自由下落的前80毫秒进行了研究。H反射的易化在释放后约30至40毫秒开始，这代表了运动神经元易化的开始，早于释放后约80毫秒开始的肌电图活动。T反射的更早易化可能如马修斯和怀特赛德（1960年）所提出的那样，是由于肌肉形状变化导致的肌梭兴奋，但这些作者所描述的在坐着下落50毫秒后出现的T反射抑制可能纯粹是一种机械现象。
