Document Detail

Analysis of electromyographic signals in human jaw closing muscles at various isometric force levels.
MedLine Citation:
PMID:  3257089     Owner:  NLM     Status:  MEDLINE    
The effect of sustained isometric contraction on surface electromyograph (EMG) and force signals derived from these muscles was examined. Premolar-molar region force was measured with a small unilaterally positioned force transducer. Subjects produced and sustained 25, 50, 75 and 100 per cent isometric force levels, and measurements were made at the beginning and end of these efforts. There was no significant change in the resulting EMG/force ratio at any of the force levels. The EMG signal did exhibit a significant shift in its frequency both as the force level increased and during the sustained effort. Neuromuscular fatigue, when defined as a change in the EMG/force ratio, was not demonstrated even though there was a consistent change in the frequency of the EMG signal.
G T Clark; M C Carter; P L Beemsterboer
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Archives of oral biology     Volume:  33     ISSN:  0003-9969     ISO Abbreviation:  Arch. Oral Biol.     Publication Date:  1988  
Date Detail:
Created Date:  1989-10-19     Completed Date:  1989-10-19     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  0116711     Medline TA:  Arch Oral Biol     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  833-7     Citation Subset:  D; IM    
Dental Research Institute, School of Dentistry, University of California, Los Angeles 90024-1762.
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MeSH Terms
Bite Force
Isometric Contraction*
Jaw / physiology*
Masseter Muscle / physiology*
Masticatory Muscles / physiology*
Muscle Contraction*
Temporal Muscle / physiology*
Grant Support

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