Effects of unilateral jaw clenching on cerebral/systemic circulation and related autonomic nerve activity
Effects of unilateral jaw clenching on cerebral/systemic circulation and related autonomic nerve activity
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DOI：
10.1016/j.physbeh.2011.07.028
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发表时间：
2012-01
影响因子：
2.9
通讯作者：
Min Zhang;Y. Hasegawa;Joe Sakagami;T. Ono;K. Hori;Y. Maeda;Yongjin Chen
中科院分区：
文献类型：
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作者：
Min Zhang;Y. Hasegawa;Joe Sakagami;T. Ono;K. Hori;Y. Maeda;Yongjin Chen
下巴紧握（紧握）是一个等长收缩的结果下巴关闭肌肉。由于工作肌肉的位置和牙齿接触时的传入信息，紧咬对大脑和体循环的影响可能不同于等长肢体运动。本研究旨在通过比较握力运动时的脑循环和体循环变化，探讨咬牙运动时脑循环和体循环变化的特征。受试者为17名右撇子男性。分别在单手握力训练和握拳训练中，测量双侧大脑中动脉血流速度（MCAV）、收缩肌肌电图（EMG）、心率（HR）和血压（BP）。通过分析HR和BP的波动来评估自主神经活动。MCAV显着增加，在任务中，显着较高的值，非工作侧比工作侧，无论是单方面的手握或单方面咬紧牙关。在下颌紧咬的HR变化低于那些在手握运动，和血管运动交感神经活动的变化在左下颌紧咬低于那些在左手握运动。本研究结果表明，与手握运动相比，单侧咬紧牙关可促进双侧MCAV的激活，但对心输出量和交感神经系统活动的影响较小。
Jaw clenching (clenching) is the result of an isometric contraction of jaw closing muscles. Because of the location of working muscles and afferent information during tooth contact, the effect of clenching on the cerebral and systemic circulation might differ from that of isometric limb exercise. This study aimed to investigate the characteristic changes in cerebral and systemic circulation during jaw clenching by comparing those during handgrip exercise. Subjects were 17 right-handed men. Bilateral middle cerebral arterial blood flow velocity (MCAV), electromyography (EMG) of contracting muscles, heart rate (HR) and blood pressure (BP) were measured during unilateral handgrip exercise and clenching tasks. Autonomic nerve activity was evaluated by analyzing fluctuations in HR and BP. MCAV was significantly increased during the task with significantly higher values on the non-working than working side irrespective of unilateral handgrip or unilateral jaw clenching. Changes in HR during jaw clenching were lower than those during handgrip exercise, and changes in vaso-motor sympathetic nerve activity during left jaw clenching were lower than those during left handgrip exercise. The present results indicate that, compared with handgrip exercise, unilateral jaw clenching promotes bilateral activation of MCAV with smaller effects on cardiac output and sympathetic nervous system activity.