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予測可能な外部摂動に対する姿勢調整に及ぼす顎の食いしばりの影響
Effect of jaw clenching on postural adjustments to a predictable external perturbation.
PMID: 33485257 DOI: 10.1016/j.jelekin.2020.102512.
抄録
本研究では、顎の食いしばりが予測的姿勢調整(APA)と反応的姿勢調整(RPA)に及ぼす影響を調査した。健康な成人8名を対象に、顎の食いしばりの有無にかかわらず、予測可能な外部摂動に曝露した。12の筋肉の3次元身体運動学、接地反力、筋電図(EMG)を記録した。顎を食いしばった状態と対照の状態では、姿勢調整の予測相と反応相の間の筋電図の開始、統合筋電図、質量中心(COM)と圧力中心(COP)の位置を計算し、比較した。顎を食いしばるとAPAの発症が早くなり、APAとRPAでは体幹と下肢のEMG活動の振幅が大きくなった。摂動後のCOMとCOPの変位には差がなかった。顎の食いしばりは、健康な成人では予測可能な外乱後の姿勢安定性を向上させない可能性があるが、APAとRPAの増強には有効である。
This study investigated the effect of jaw clenching on anticipatory postural adjustments (APAs) and reactive postural adjustments (RPAs). Eight healthy adults were exposed to predictable external perturbations with and without submaximal jaw clenching. We recorded the three-dimensional body kinematics, ground reaction forces, and electromyography (EMG) of 12 muscles. EMG onset, integrated EMG, and positions of the center-of-mass (COM) and center-of-pressure (COP) during the anticipatory and reactive phases of postural adjustments were computed and compared for the jaw clenching and control conditions. Jaw clenching resulted in an earlier onset of APAs and a greater amplitude of trunk and lower limb EMG activities in the APAs and RPAs. There were no differences in the COM and COP displacements after the perturbation. Jaw clenching is effective for enhancing APAs and RPAs, although it may not increase postural stability following predictable external perturbation in healthy adults.
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