利用H反射测量肌伸张反射通路的兴奋性已有多年,方法学上的问题之一是诱发H反射的有效刺激强度是否有变化,外来刺激强度的恒定并不一定能给靶神经以恒定的有效刺激,因为关节运动可能改变皮肤、皮下结缔组织、神经等的张力,而使刺激电极与神经产生相对运动。除刺激强度外,常用M波波幅作为有效刺激强度恒定的指标,即M波波幅变化时就拒斥该次扫描。Leanard等提出腓肠肌 It has been used for many years to measure the excitability of muscular stretch reflex pathways by means of H reflex. One of the methodological problems is whether there is any change in the effective stimulus intensity for inducing H reflex. The invariance of the external stimulus does not always give the target nerve a constant and effective Stimulation, because the joint movement may change the skin, subcutaneous connective tissue, nerves and other tension, leaving the stimulation of the electrode and the relative movement of the nerve. In addition to the stimulus intensity, the commonly used M-wave amplitude as an effective stimulus intensity constant index, that is, when M-wave amplitude changes reject the scan. Leanard et al. Proposed gastrocnemius