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

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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.