Document Detail


Effects of a ten-second maximum voluntary contraction on regulatory myosin light-chain phosphorylation and dynamic performance measures.
MedLine Citation:
PMID:  17313284     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The purpose of this investigation was to evaluate the role of an elevated regulatory myosin light-chain (RLC) phosphorylation on subsequent postactivation potentiation induced by a 10-second maximum voluntary contraction (MVC). With the use of a repeated measures design, data were collected from 11 recreationally active men who performed an explosive knee extension exercise with a load of 70% of their 1 repetition maximum. Muscle biopsies of their vastus lateralis were taken pre- and post-MVC. Seven subjects had elevated RLC phosphorylation (positive responders) and 4 had a decrease in RLC phosphorylation (negative responders). Percent change of force, velocity, and power measures did not differ between the 2 groups. Our results suggest that recreationally active men will not benefit from the effects of postactivation potentiation during performance with a 7-minute recovery period. Furthermore, we suggest that training status, strength, and skill level might be key determining factors for the positive benefits of postactivation potentiation during performance.
Authors:
J Chadwick Smith; Andrew C Fry
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of strength and conditioning research / National Strength & Conditioning Association     Volume:  21     ISSN:  1064-8011     ISO Abbreviation:  J Strength Cond Res     Publication Date:  2007 Feb 
Date Detail:
Created Date:  2007-02-22     Completed Date:  2007-04-26     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9415084     Medline TA:  J Strength Cond Res     Country:  United States    
Other Details:
Languages:  eng     Pagination:  73-6     Citation Subset:  IM; S    
Affiliation:
Department of Neurobiology and Anatomy, Wake Forest University, Winston-Salem, North Carolina 27157, USA. chadsmit@wfubmc.edu
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MeSH Terms
Descriptor/Qualifier:
Adult
Analysis of Variance
Humans
Knee*
Male
Muscle Contraction / physiology*
Muscle, Skeletal / metabolism*
Myosin Light Chains / metabolism*
Phosphorylation
Chemical
Reg. No./Substance:
0/Myosin Light Chains

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


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