FUNCTIONAL RELATIONS BETWEEN JAW, HEAD, NECK AND BACK MUSCLES

1. 作为一项实验前研究，我们观察了23名健康受试者的头、颈、肩和背部不适。结果表明，等距水平下颚运动负荷可引起不愉快、疲劳、疼痛、窒息、运动障碍和强烈的感觉，这暗示了下颚、头、颈和背部肌肉之间的功能关系。(1) 8名健康参与者进行水平等距下颌运动，下颌肌肉最大程度的自主收缩，直到他们无法忍受任务。观察双侧胸锁乳突肌上、下区域和斜方肌颈、肩区域的肌电活动。(2)在32个实验中，超过94%的实验中，任务时肌电信号振幅高于休息时，超过78%的实验中，肌电信号爆发的时间变化与运动的发作偏移同步。(3)在超过72%的实验中，小幅度肌电图在任务停止后仍然存在。(4)运动时颈侧肌区肌肉活动度优于颈肩肌区，且在等长收缩时颈肩肌电信号振幅最高。(1) 11名健康的参与者在不同的姿势下以最大的自主力量进行等长水平下颌运动。采集双侧颈侧、颈项、肩部和背部的表面肌电信号，同时记录下颚力。(2)这些区域肌电功率值与颌骨运动方向有关（后拉>后拉>前推=前侧推，P<0.0001）。(3)上述定向效应在下颈侧（2号电极）和背侧（5号电极）均有显著性差异（P<0.0001）。(4)姿势对功率值的影响随下颚练习方向的不同而变化（P<热力学>0.03）；在直立体位时，拔颌值最高，而仰卧体位时，推颌值最低

1. As a pre-experimental study, discomfortableness in the head, neck, shoulder and back regions was observed in 23 healthy subjects. It was conformed that Unpleasant, Fatigate, Painful, Suffocative, Dyskinesthetic and Forocious sensations was able to be induced by loading of isometric horizontal jaw movement which implied functional relations between the jaw, head, neck and back muscles.2. (1) Eight healthy participants performed horizontal isometric jaw movements with maximum voluntary contractions of the jaw muscles until they could not tolerate the task. Electromyographic activities bilaterally recorded from the superior and inferior regions of the sternocleidomastoid muscle and the nuchal and shoulder regions of the trapezius muscle were observed.(2) In more than 94% of 32 trials, the amplitude of EMGs during the task were higher than those at rest, and in more than 78%, temporal changes in EMG burst were synchronized with the onset-offset of the exercise.(3) In more than 72% of al … More l trials, small amplitude EMG lasted after cessation of the task.(4) Muscle activities of the lateral cervical region during the exercise were superior to the activity of the nuchal and shoulder regions, and amplitude of EMGs in the neck and shoulder regions tended to be the highest during isometric retrusion.3.(1) Eleven Healthy Participants were made to perform isometric horizontal jaw movements with maximum voluntary efforts in various postures. Surface EMGs from the laterocervical, nucha, shoulder and back regions were bilaterally picked up, and simultaneously recorded with jaw force.(2) Electromyographic power value in these regions depended on the directions of the jaw exercises (posteriorly pull > posterolaterally pull > anteriorly push = anterolaterally push, P<0.0001).(3) The directional effects mentioned above were significantly obvious in the inferior laterocervical (Electrode No.2) and back (Electrode No.5) regions (P<0.0001).(4) The postural effects on the power value were varied with the directions of the jaw exercises (P<thermodynamics>0.03);i.e., the highest value during jaw pull was observed in an upright position, while that during jaw push was found in a supine position Less