Document Detail

Surface electromyographic estimates of recruitment/rate coding of masseteric motor units.
MedLine Citation:
PMID:  1517874     Owner:  NLM     Status:  MEDLINE    
Surface electromyographic (EMG) recordings were obtained from the masseter muscles in healthy subjects performing brisk maximum voluntary teeth clenching (MVC) for about 1 s. During the onset (0-600 ms) of ballistic MVC activity, the peak amplitude of the EMG interference patterns showed a consistent and significant increase, on examination for 0-200 ms, 200-400 ms, and 400-600 ms of MVC activity. The peak (maximum) and median (centroid) frequencies of power spectrum density functions of the raw surface EMGs (interference patterns) showed an absence of consistent and significant changes during 0-600 ms of ballistic MVC activity. However, the estimated total energy contents (peak amplitude x peak frequency) of the surface interference patterns showed a consistent and significant increase from 0 to 600 ms of ballistic MVC activity, and this was interpreted as global recruitment/rate coding of masseteric motor units.
S J Donegan; L V Christensen; A M Kaltenbrunner
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of oral rehabilitation     Volume:  19     ISSN:  0305-182X     ISO Abbreviation:  J Oral Rehabil     Publication Date:  1992 Mar 
Date Detail:
Created Date:  1992-10-07     Completed Date:  1992-10-07     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0433604     Medline TA:  J Oral Rehabil     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  129-36     Citation Subset:  D; IM    
Marquette University, School of Dentistry, Milwaukee.
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MeSH Terms
Analysis of Variance
Fourier Analysis
Isometric Contraction / physiology
Masseter Muscle / innervation*
Motor Neurons / physiology*
Recruitment, Neurophysiological / physiology*
Sensory Thresholds / physiology
Time Factors

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