Electromyograms were recorded from the main chewing muscles ( mm. masseter and temporales ) in 184 patients suffering from dysfunction of the temporomandibular joints and 25 healthy subjects (controls). In the patient group, the mean duration of the silence phase in cyclic EMG activity of the above muscles related to normal chewing (293.8 msec, a value averaged for all examined muscles and all examined patients) was by about 30% smaller than the analogous value in the control group. At the same time, the mean duration of the activity phase did not differ significantly from that in the control. The ratio of durations of the activity vs. silence phases in the patient group was 1.352, as compared with 0.946 in control subjects. The mean duration of the chewing cycle (also totally averaged for the patients) was 691.1 sec vs. 814.4 msec in the control; the respective mean values of the chewing frequency in the above groups were 1.447 and 1.228 sec –1 . The results obtained confirm the statement that parameters of functioning of the brainstem neuronal central pattern generator (CPG), a neuronal network responsible for generation of cyclic motor commands for chewing muscles, can be significantly modified under the influence of a changed afferent inflow, especially in the case where the latter contains a considerable nociceptive component related to the dysfunctional state of the temporomandibular joints.

中文翻译：

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颞下颌关节功能障碍中咀嚼肌的肌电图活动

记录了 184 名患有颞下颌关节功能障碍的患者和 25 名健康受试者（对照组）的主要咀嚼肌（咬肌和颞骨）的肌电图。在患者组中，与正常咀嚼相关的上述肌肉的循环 EMG 活动的静默期平均持续时间（293.8 毫秒，所有检查肌肉和所有检查患者的平均值）比类似值小约 30%在对照组。同时，活动阶段的平均持续时间与对照组没有显着差异。患者组活动持续时间与沉默阶段的比率为 1.352，而对照组为 0.946。咀嚼周期的平均持续时间（对于患者也是完全平均的）为 691.1 秒，而对照组为 814.4 毫秒；上述各组咀嚼频率的平均值分别为1.447和1.228 sec –1 。获得的结果证实了以下说法：脑干神经元中枢模式发生器 (CPG) 的功能参数可以在传入流入变化的影响下显着改变，尤其是在后者包含与颞下颌关节功能障碍状态相关的大量伤害性成分的情况。