Document Detail

An electromyographic volley at initiation of rapid isometric contractions of the elbow.
MedLine Citation:
PMID:  8420629     Owner:  NLM     Status:  MEDLINE    
When normal subjects made rapid isometric extensions of the elbow to target torque, the agonist electromyograms (EMGs), recorded by a monopolar surface electrode, initiated from an EMG volley which was characterized by a negative potential immediately followed by a positive one. This study examined properties of the EMG volley and determined whether or not it is a movement artifact. Surface EMGs recorded by multiple monopolar electrodes showed that the negative peak of the EMG volley was earliest and greatest in amplitude at the motor point region. The integrated negative potential correlated with peak torque. EMGs recorded by needle and bipolar surface electrodes showed a duration of comparative activity with the EMG volley. To eliminate movements between the skin and monopolar electrode, the skin around the electrode was clamped to a fixture. This left the EMG volley unchanged. The antagonist showed a similar EMG volley, but was less stable in duration and amplitude. Our results demonstrated that the EMG volley is not a movement artifact.
Y Yamazaki; M Suzuki; T Mano
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Brain research bulletin     Volume:  30     ISSN:  0361-9230     ISO Abbreviation:  Brain Res. Bull.     Publication Date:  1993  
Date Detail:
Created Date:  1993-02-12     Completed Date:  1993-02-12     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  7605818     Medline TA:  Brain Res Bull     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  181-7     Citation Subset:  IM    
Department of Health and Physical Education, Nagoya Institute of Technology, Japan.
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MeSH Terms
Elbow Joint / physiology*
Electromyography / instrumentation,  methods
Isometric Contraction / physiology*
Muscles / innervation,  physiology*
Time Factors

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