Abstract
Objective
To compare the electrophysiological activity in submandibular hyolaryngeal muscles
during performance of 2 exercises that incorporate resistance against muscular contraction.
Design
Within-subject repeated-measures design.
Setting
Academic research laboratory.
Participants
Healthy, young adult women (N=26; mean age, 24.1y) without a history of dysphagia,
cervical spine conditions, neurologic disease, or head/neck cancer.
Interventions
Participants performed 2 isometric exercises requiring contraction against resistance
to the submandibular hyolaryngeal muscles: one requiring jaw opening against a semirigid
brace (chin-to-chest [CtC] exercise) and one requiring a chin tuck against an air-inflated
rubber ball (chin tuck against resistance [CTAR] exercise). Measures of electrophysiology
using surface electromyography (sEMG) were obtained during exercise performance.
Main Outcome Measures
Microvolts as measured from sEMG electrode sensors placed on the skin surface above
the hyolaryngeal muscles (surface of skin above geniohyoid, mylohyoid, and anterior
digastric). Dependent variables included peak contraction amplitude (in μV) and mean
contraction amplitude (in μV) across 10 seconds of sustained contraction.
Results
Significant effects of exercise on peak and mean contraction amplitudes were present
when both exercises were compared with baseline sEMG activity. (P<.001 for both). Normalized values of peak contraction amplitude and mean contraction
amplitude during performance of CtC were not significantly different compared with
CTAR.
Conclusions
This study provides supporting evidence for the influence of 2 published exercises
on motor unit recruitment in the submandibular hyolaryngeal muscles, both of which
have been previously proposed as rehabilitative modalities. Theoretical and clinical
implications are discussed.
Keywords
List of abbreviations:
CTAR (chin tuck against resistance), CtC (chin to chest), MANOVA (multivariate analysis of variance), PsEMG (peak surface electromyography), sEMG (surface electromyography), sEMGmean (mean surface electromyography), UES (upper esophageal sphincter)To read this article in full you will need to make a payment
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Article info
Publication history
Published online: December 01, 2015
Footnotes
Disclosures: none.
Identification
Copyright
© 2016 by the American Congress of Rehabilitation Medicine
