Document Detail

Electromyographic and mechanomyographic estimation of motor unit activation strategy in voluntary force production.
MedLine Citation:
PMID:  15646006     Owner:  NLM     Status:  MEDLINE    
Electromyographic and mechanomyographic estimation of motor unit activation strategy in voluntary force production. In order to determine whether electromyogram (EMG) and mechanomyogram (MMG) are suitable for the noninvasive estimation of the motor unit (MU) activation strategy, the EMG/force and MMG/force relationships were examined simultaneously during isometric ramp contractions in biceps brachii muscle. The highest mean power frequency (MPF) of the EMG, which reflects the full MU recruitment, was determined at 51% MVC. Two obvious inflection points were identified on the MMG-amplitude/force relationship that showed an initial slow increase followed by a rapid increase and a progressive decrease at higher force levels. Our results suggest that the MMG amplitude allows the estimation of the beginning of recruitment of MUs that innervate the first-twitch fibers in addition to identification of the full MU recruitment. The rate coding strategy was qualitatively reflected by the MMG-MPF/force relationship. We conclude that the MU activation strategy is estimated in more detail by the MMG than by the EMG.
K Akataki; K Mita; M Watakabe
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Publication Detail:
Type:  Clinical Trial; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Electromyography and clinical neurophysiology     Volume:  44     ISSN:  0301-150X     ISO Abbreviation:  Electromyogr Clin Neurophysiol     Publication Date:  2004 Dec 
Date Detail:
Created Date:  2005-01-13     Completed Date:  2005-03-29     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0327533     Medline TA:  Electromyogr Clin Neurophysiol     Country:  Belgium    
Other Details:
Languages:  eng     Pagination:  489-96     Citation Subset:  IM    
Department of Functioning Science, Institute for Developmental Research, Aichi Human Service Center, Kasugai 480-0392, Japan.
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MeSH Terms
Arm / physiology
Isometric Contraction / physiology*
Motor Neurons / physiology*
Muscle, Skeletal / physiology*
Recruitment, Neurophysiological / physiology*
Reference Values
Reproducibility of Results
Weight-Bearing / physiology

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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