Ashby P, Burke D
J Neurol Neurosurg Psychiatry. 1971 Dec;34(6):765-71. doi: 10.1136/jnnp.34.6.765.
The reflex response to stretch has been studied in the upper limb of 20 spastic patients. The amplitude of reflex EMG was found to be closely related to the velocity of stretch. Reflex EMG in biceps and triceps muscles was augmented by increasing the length of the muscle, although minimal inhibition of reflex EMG in biceps was obtained in two patients by extreme stretch. The clasp-knife sensation in the upper limb cannot be related to autogenic inhibition but may be explained by the characteristics of a velocity-dependent reflex in which limb movement is braked by the mechanical effect of increasing muscle tension. It is suggested that this be called the pseudo-clasp-knife reaction to distinguish it from the clasp-knife phenomenon of the quadriceps muscle, since the underlying neurophysiological mechanism is quite different.
对20例痉挛患者的上肢进行了牵张反射反应的研究。发现反射肌电图的幅度与牵张速度密切相关。通过增加肌肉长度可增强肱二头肌和肱三头肌的反射肌电图，不过在两名患者中，通过极度牵张获得了肱二头肌反射肌电图的最小抑制。上肢的折刀样感觉与自生抑制无关，但可能由速度依赖性反射的特征来解释，在这种反射中，肢体运动因肌肉张力增加的机械效应而受到制动。建议将其称为假性折刀样反应，以区别于股四头肌的折刀样现象，因为其潜在的神经生理机制有很大不同。
