Physiological Analysis of Correlation Between Oral Function and Body Motor Ability.

本文以11名健康成人为研究对象，研究了人类比目鱼肌h反射（Sol, H-R）在主动咬牙时的调节，以探讨下颌和身体运动功能之间可能存在的相关性。得到以下结果：(1)在最大自觉咬牙时促进Sol H-R。这一促进作用超过了身体其他部位的最大自愿努力，即Jendrassik动作和双侧握拳。(2)咬肌肌电活动的振幅增加，促进Sol. H-R的量也随之增加；(3)咬合相关的Sol. H-R的促进作用在咬肌肌电活动开始前约60ms开始，在咬肌肌电活动开始后约100ms达到峰值，随后根据咬肌肌电活动水平下降到一定的平台水平。(4)下唇电刺激对咬肌EM(3)活动的反射性抑制使咬合时的H-R降低，但仍保持促进作用。结果表明，在咬牙过程中，H-R的兴奋性显著提高。(2) h - Sol易化量与咬合力水平呈正相关，(3)易化量既受上脑下行影响，也受口腔结构传入输入的影响。一般认为口腔运动活动对身体运动功能有很强的影响，

Modulation of the human soleus H-reflex (Sol, H-R) was studied during voluntary teeth clenching in 11 healthy adult volunteers, to investigate the possible correlation of motor functions between the jaw and body.The following results were obtained ;(1) Sol. H-R was facilitated during the maximum voluntary teeth clenching. The facilitation exceeded that during the maximum voluntary efforts in the other parts of the body, i. e., Jendrassik maneuver and bilateral fists clenching.(2) The amount of the Sol. H-R facilitation increased with the amplitude of masseter EMG activity,(3) Facilitation of the Sol. H-R in association with teeth clenching started ca. 60ms before the-onset of masseter EMG activity, reached its peak ca. ]100ms after the onset and thereafter decreased to a certain plateau level in accordance with the masseter EMG activity level.(4) Facilitation of the So] : H-R during teeth clenching was decreased when the masseter EM(3 activity was reflexively inhibited by electrical stimulation of the lower lip, though the facilitation was still retained.It was concluded that]) the excitability of the Sol. H-R is remarkably elevated during teeth clenching. 2) there is a positive correlation between the amount of the facilitation of the Sol. H-Rand the teeth clenching force level, and 3) the facilitation is due to both the descending influence from the higher brain and the afferent inputs from the oral structures.It is assumed that the oral motor activity exerts a strong influence on the body motor function in general,