The effect of changing the occlusal contact in EMGs during ski performance

本研究的目的是探讨在身体平衡需要控制的情况下，改变咬合接触对滑雪表现的影响。在这种表演中，如何在身体运动中限制头部通常被认为是最重要的事情之一。因此，我们记录了改变咬合接触前后颌面部和颈部肌肉的肌电图。滑雪时的肌电记录是用小型便携式PC卡记录仪获得的。受试者为正常闭塞的男性。滑雪道在7根滑雪杆之间进行，距离为100米。使用小型便携式摄像机记录滑雪时的身体运动，同时记录两侧咬肌、颞肌和胸锁乳突肌的肌电图。在每个受试者进行三次试验后，在右上磨牙上安装为受试者量身定制的金属帽，以改变咬合接触情况，进行三次试验。当设置改变咬合条件的上限时，颞肌和胸锁乳突肌肌电图活动模式发生改变，试验时间延长。

The purpose of this study was to investigate the effect of changing the occlusal contact on ski performance, in which body balance needs controlling. In such a performance, how the head is restricted during the body motion is generally considered as one of the most important things. Therefore, we recorded EMGs from muscles of maxillofacial area and the neck, before and after changing occlusal contacts. EMG recordings during skiing were obtained with a small portable PC card recorder. The subjects were males with normal occlusion.The ski runs were performed through between 7 ski poles in a distance of 100 meters. The body motion during skiing was recorded by the use of a small portable video camera, with simultaneous EMG recordings from masseter muscles, temporal muscles, and sternocleidomastoid muscles on both sides. After each subject had three trials, the metal cap, made for the individual subject to change occlusal contact condition, was set on the upper right molar, and three trials were performed.Results. Activity pattern of EMGs of temporal muscles and sternocleidomastoid muscles changed and trials took more time when the cap for changing occlusal condition was set.