Effect of jaw clenching on postural adjustments to a predictable external perturbation

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 kinemati...

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Bibliographic Details
Published in:Journal of electromyography and kinesiology 2021-04, Vol.57, p.102512-102512, Article 102512
Main Authors: Tomita, Yosuke, Tanaka, Yuto, Sako, Kazuki, Ono, Yoshiaki, Tanaka, Masahiro
Format: Article
Language:English
Subjects:
Anticipatory postural adjustments
Biomechanical Phenomena - physiology
Electromyography - methods
External perturbation
Facial Muscles - physiology
Female
Forecasting
Humans
Jaw - physiology
Jaw clenching
Male
Muscle Contraction - physiology
Postural Balance - physiology
Postural stability
Posture - physiology
Reactive postural adjustments
Temporomandibular Joint Disorders - physiopathology
Temporomandibular Joint Disorders - psychology
Young Adult
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Summary: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.
ISSN:1050-6411
1873-5711
DOI:10.1016/j.jelekin.2020.102512