Document Detail

Influence of voluntary teeth clenching on the stabilization of postural stance disturbed by electrical stimulation of unilateral lower limb.
MedLine Citation:
PMID:  19879763     Owner:  NLM     Status:  MEDLINE    
Studies on the relationship between dental occlusion and body balance have suggested that occlusion status contributes to the maintenance of postural balance. However, little has been reported about the effects of voluntary teeth clenching on the stabilization of postural stance in novel environments. In the present study we investigated whether teeth clenching influenced adaptation to the perturbation introduced by electrical stimulation of a unilateral lower limb. Subjects (12 adults) stood on a force plate, from which motion data were obtained in the horizontal plane with and without voluntary teeth clenching and were instructed to maintain the position throughout the experiment. We evoked a novel environment by supramaximal percutaneous electrical stimulation of the common peroneal nerve. Electromyograms (EMG) were recorded from the masseter and the peroneus longus (PL) muscles with bipolar surface cup electrodes. When the disturbed postural stance was generated by electrical stimulation, the maximum reaction force in the anterior-posterior (A/P) direction with teeth clenching (CL) was significantly smaller than that without voluntary teeth clenching (control; CO) (p<0.05) and the peak time of the ground reaction force/body mass (GRF/BM) in the A/P direction occurred earlier in the CL condition than CO (p<0.05). There were no significant differences in the peak-to-peak amplitude of GRF/BM and the peak time of GRF/BM, in the M/L direction under both CL and CO conditions. Thus, the present study showed that voluntary teeth clenching contributed to stabilization of the postural stance perturbed transiently by electrical stimulation. We concluded that voluntary teeth clenching plays an important role in rapid postural adaptation to the anterior-posterior perturbation in the upright position.
Sachiko Fujino; Toshiyuki Takahashi; Toshiaki Ueno
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Publication Detail:
Type:  Journal Article     Date:  2009-10-30
Journal Detail:
Title:  Gait & posture     Volume:  31     ISSN:  1879-2219     ISO Abbreviation:  Gait Posture     Publication Date:  2010 Jan 
Date Detail:
Created Date:  2010-02-03     Completed Date:  2010-05-18     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9416830     Medline TA:  Gait Posture     Country:  England    
Other Details:
Languages:  eng     Pagination:  122-5     Citation Subset:  IM    
Copyright Information:
Copyright 2009. Published by Elsevier B.V.
Department of Sports Medicine and Dentistry, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8549, Japan.
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MeSH Terms
Electric Stimulation
Jaw / innervation,  physiology*
Lower Extremity / physiology*
Masticatory Muscles / innervation,  physiology*
Postural Balance / physiology*
Statistics, Nonparametric
Volition / physiology

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