Involuntary clenching during elbow flexion exercise.
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概要
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Involuntary clenching is common during physical exercise, therefore this study was aimed to elucidate the relationship between the stomatognathic system's neuromusculature and physical exercise with elbow flexion as model.<BR>In twelve healthy, fully dentate males (mean age: 27.9±1.8), mandibular position, electromyographic (EMG) activity from jaw closing (JM), sternocleidomastoid (SCM) and biceps brachial (BB) muscles, and elbow flexion strength were simultaneously recorded during elbow flexion tasks. The factors subject to analysis were: 1) EMG activity and mandibular position during the exercise, 2) time coordination of the stomatognathic and biceps brachial muscles, 3) elbow flexion strength allowing or not, involuntary clenching. Following the criteria whether the subjects involuntary clenched or not during the task, they were divided into two group: the Clenching group (8 subjects) and the Non-clenching group (4 subjects) . Results:<BR>1) Clenching group: Mandibular position was located in the intercuspal position (ICP) . Onset of EMG activity in the JM occurred prior to that of the BB in 5 subjects, but in the whole group the BB's EMG onset occurred prior to the SCM's. These data indicate that involuntary clenching during the task was not implemented by reflexive or feed-back mechanisms, but by the so called feedforward mechanism. When the subjects were instructed to avoid clench-ing during the task, elbow flexion strength significantly decreased (p<0.05) .<BR>2) Non-clenching group: The mandible shifted horizontally without occlusal contacts. Elbow flexion strength was not significantly different (p>0.05) for either clenching or not during the task.<BR>From these results, we conclude that the stomatognathic system's neuromusculature and physical exercise are closely related and that involuntary clenching may play an important role in the execution of physical exercise in some individuals.
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