Influence of methodological parameters on human jaw-stretch reflexes.
Influence of methodological parameters on human jaw-stretch reflexes.
复制标题
方法参数对人类下颌伸展反射的影响。
DOI：
10.1034/j.1600-0722.2001.00987.x
复制
发表时间：
2001
影响因子：
1.9
通讯作者：
P. Svensson
中科院分区：
文献类型：
--
作者：
Kelun Wang;P. Svensson
为了建立一种可靠的研究运动神经元池兴奋性的工具，研究了方法参数和实验条件对正常人下颌拉伸反射的影响。采用特制的拉伸装置，让受试者用门牙咬颌条，诱发短潜伏期兴奋性反射反应。拉伸位移和斜坡时间由计算机精确控制并自动触发。用肌表面肌电图（EMG）测量咬肌和颞前肌的反射反应，并在线监测握紧程度。在等距收缩时，下颌拉伸反射的峰对峰振幅与肌电活动水平成正比，在给定的斜坡时间随拉伸位移的增加而成比例增加，在给定的拉伸位移下随斜坡时间的增加而成比例减少。在一次重复录音之间或不同录音之间，反射振幅无显著差异。下门牙和上门牙周围局麻对反射幅度无明显影响。然而，不同咬位对拉伸装置杆的拉伸反射振幅有显著影响。
The influence of methodological parameters and experimental conditions on the human jaw-stretch reflex was studied in healthy subjects in order to develop a reliable tool for investigation of the excitability of motoneuron pool. Short-latency excitatory reflex responses were evoked by a custom-made stretch device with the subjects biting on a jaw-bar with their front teeth. The displacement and ramp time of the stretches were accurately controlled and automatically triggered by a computer. The reflex responses were measured in the surface electromyogram (EMG) of the masseter and anterior temporalis muscles with online monitoring of the clenching level. The peak-to-peak amplitude of the jaw-stretch reflex was shown to be proportional to the level of EMG activity during isometric contractions, to increase proportionally with increasing stretch displacement at a given ramp time, and to decrease proportionally with increasing ramp time at a given stretch displacement. There were no significant differences in the reflex amplitude between repeated recordings within one session or between different sessions. Local anesthetic around the lower incisors as well as the upper incisors had no significant influence on the reflex amplitude. However, different biting positions on the bars of the stretch device significantly influenced the amplitude of the stretch reflex.