Funase K, Imanaka K, Nishihira Y
Department of General Education, School of Allied Medical Sciences Nagasaki University, Japan.
Electromyogr Clin Neurophysiol. 1994 Dec;34(8):477-89.
The excitability of a motoneuron (MN) pool was evaluated by the developmental slope of H-reflexes (Hslp) evoked at a range of a stimulus intensity less than the threshold of an M-response. The Hslp has been regarded as the "reflex gain", which is the changing rate in MN excitability as a function of the increase of Ia input to an MN pool. In a comparison of two parameters used in the H-reflex technique, such as the ratio of the maximal H-reflex to the maximal M-response and the ratio of the threshold of an H-reflex to that of an M-response, the Hslp was predicted to be a reasonable parameter to evaluate motoneuronal excitability, because the Hslp is free from the effect of any collision between the H-reflex discharge and the antidromic volley drived from the occurrence of an M-response within the alpha-efferents, and the Hslp can estimate the recruitment properties of a whole MN pool. The Hslp was alleviated during dorsi-flexion and steepened during plantar-flexion, according to the inhibitory or facilitatory synaptic modifications onto soleus MNs. The developmental slope of an M-response (Mslp), which shows the recruitment property of axons of soleus MNs, was alleviated especially in plantar-flexion. In order to exclude the peripheral neuromuscular factors in evaluating substantial MN excitability, the Hslp/Mslp is proposed as a more effective parameter than the Hslp.
通过在一系列低于M反应阈值的刺激强度下诱发的H反射（Hslp）的发展斜率来评估运动神经元（MN）池的兴奋性。Hslp被视为“反射增益”，即MN兴奋性随Ia输入到MN池增加的变化率。在比较H反射技术中使用的两个参数，如最大H反射与最大M反应的比值以及H反射阈值与M反应阈值的比值时，Hslp被认为是评估运动神经元兴奋性的合理参数，因为Hslp不受H反射放电与α传出纤维内M反应发生所驱动的逆向冲动之间任何碰撞的影响，并且Hslp可以估计整个MN池的募集特性。根据比目鱼肌MN上的抑制性或兴奋性突触修饰，Hslp在背屈时减轻，在跖屈时变陡。M反应的发展斜率（Mslp）显示了比目鱼肌MN轴突的募集特性，尤其在跖屈时减轻。为了在评估实质性MN兴奋性时排除外周神经肌肉因素，提出Hslp/Mslp作为比Hslp更有效的参数。
