The Effect of Teeth Clenching on Dynamic Balance at Jump-Landing: A Pilot Study

作者：Nakamura Tomomasa; Yoshida Yuriko; Churei Hiroshi; Aizawa Junya; Hirohata Kenji; Ohmi Takehiro; Ohji Shunsuke; Takahashi Toshiyuki; Enomoto Mitsuhiro; Ueno Toshiaki; Yagishita Kazuyoshi^*

来源：Journal of Applied Biomechanics, 2017, 33(3): 211-215.

DOI：10.1123/jab.2016-0137

• dynamic balance
• teeth clenching
• ground reaction force
• center of pressure
• electromyogram

The aim of this study was to analyze the effect of teeth clenching on dynamic balance at jump landing. Twenty-five healthy subjects performed jump-landing tasks with or without teeth clenching. The first 3 trials were performed with no instruction; subsequently, subjects were ordered to clench at the time of landing in the following 3 trials. We collected the data of masseter muscle activity by electromyogram, the maximum vertical ground reaction force (vGRFmax) and center of pressure (CoP) parameters by force plate during jump-landing. According to the clenching status of control jump-landing, all participants were categorized into a spontaneous clenching group and no clenching group, and the CoP data were compared. The masseter muscle activity was correlated with vGRFmax during anterior jump-landing, while it was not correlated with CoP. In comparisons between the spontaneous clenching and the no clenching group during anterior jump-landing, the spontaneous clenching group showed harder landing and the CoP area became larger than the no clenching group. There were no significant differences between pre- and postintervention in both spontaneous clenching and no clenching groups. The effect of teeth clenching on dynamic balance during jump-landing was limited.

• 出版日期2017-6