Document Detail

Conflicting effects of fatigue and potentiation on voluntary force.
MedLine Citation:
PMID:  15141999     Owner:  NLM     Status:  MEDLINE    
The objective of this study was to investigate whether a warm-up consisting of a series of maximal contractions would augment the force and activation of subsequent leg extensor contractions. Both voluntary and evoked isometric contractions were tested to determine the mechanisms underlying the response. Nine subjects were tested for twitch, tetanic, submaximal (30%), and maximal voluntary contractile (MVC) properties before and after (1, 5, 10, and 15 minutes) one to three 10-second MVCs. MVC force either did not change following 1-2 MVCs or was depressed at 10 and 15 minutes after 3 MVCs. MVC activation was decreased (4.4-6.9%) throughout recovery, whereas submaximal contractions were minimally affected. Although overall, twitches were potentiated (15.5-19.8%) posttest, 3 MVCs had significantly greater twitch potentiation than 1 or 2 MVCs at 5 and 10 minutes. Results suggest that voluntary and evoked contractions respond differently to prior 10-second MVCs. In the present study, a warm-up routine of 1-3 MVCs of a 10-second duration did not enhance subsequent voluntary performance.
David G Behm; Duane C Button; Glen Barbour; Jeremy C Butt; Warren B Young
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Publication Detail:
Type:  Clinical Trial; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of strength and conditioning research / National Strength & Conditioning Association     Volume:  18     ISSN:  1064-8011     ISO Abbreviation:  J Strength Cond Res     Publication Date:  2004 May 
Date Detail:
Created Date:  2004-05-14     Completed Date:  2004-08-31     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  9415084     Medline TA:  J Strength Cond Res     Country:  United States    
Other Details:
Languages:  eng     Pagination:  365-72     Citation Subset:  IM    
School of Human Kinetics and Recreation, Memorial University of Newfoundland, St. John's, Newfoundland, Canada.
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MeSH Terms
Analysis of Variance
Exercise / physiology*
Isometric Contraction / physiology*
Muscle Fatigue / physiology*
Muscle, Skeletal / physiology*

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

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