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

为探讨下颌运动功能与身体运动功能的可能相关性，对11名健康成年志愿者进行了磨牙时比目鱼肌H反射（Sol，H-R）的调制研究，结果表明：（1）Sol. H-R在最大自愿咬牙期间被促进。这种促进作用超过了身体其他部位最大自愿努力时的促进作用。例如，Jendrassik动作和双手握拳。(2)量的溶胶。H-R易化随咬肌肌电活动幅度的增加而增强。大约开始与咬紧牙齿相关的HR。在咬肌肌电活动开始前60 ms左右达到峰值。] 100 ms后下降到一个与咬肌肌电活动水平相一致的平台水平。(4)当电刺激下唇反射性抑制咬肌EM（3）活动时，咬肌SO（3）：H-R的易化作用减弱，但这种易化作用仍保持不变。H-R在咬牙期间显著升高。2)Sol的易化量之间存在正相关。H-R和咬牙力水平，3）易化是由于来自高级脑的下行影响和来自口腔结构的传入输入。

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,