The ethological analysis of stomatognathic function with 24 hours EMG of masticatory muscles

本研究的目的是评估和比较颞下颌关节（TM）紊乱组（TMD组）和正常组（N组）的肌肉活动。研究对象为22名正常人和11名TM障碍患者。采用双极AgAgCl表面电极获得咬肌肌电图（EMG），并在便携式盒式磁带录音机上记录24小时。同时记录受试者的行为和饮食菜单。将肌电记录进行整合、模数转换，并在个人电脑上使用我们独创的分析程序进行分析。24小时数据分为3个阶段，即用餐时间、睡眠时间和其他时间。TMD组与N组肌肉活动模式相似。然而，在进餐时间，TMD组的咬肌活动倾向于低于N组。另一方面，在睡眠时间，TMD组的肌肉活动倾向于大于N组。这些结果为建立新的TM疾病的行为学诊断体系和早期发现一些潜在的TM疾病患者提供了可能。

The purpose of this study was to evaluate and compare ethologically the muscle activity between temporomandibular (TM) disorder subjects (TMD group) and normal subjects (N group). The subjects were 22 normal persons and 11 TM disorder persons. Electromyogram (EMG) was obtained from masseter muscle using bipolar AgAgCl surface electrodes and recorded on a portable cassette tape recorder for 24 hours. The behavior and meal menu of subjects were also recorded. The EMG recording was integrated, A-D converted and analyzed with our original analyzing programs on a personal computer. The 24 hours data was divided into 3 phases, i. e., meal time, sleeping time and the other time. TMD group and N group showed similar muscle activity patterns. However, in the meal time, the masseter muscle activity of the TMD group tended to be less than that of N group. On the other hand, in the sleeping time, the muscle activity of TMD group tended to be larger than that of N group. These results suggest a possibility to establish a new ethological diagnostic system of TM disorders and to find some potential patients with TM disorders in its early stages.