| Effects of a ten-second maximum voluntary contraction on regulatory myosin light-chain phosphorylation and dynamic performance measures. | |
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MedLine Citation:
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PMID: 17313284 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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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. |
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Authors:
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J Chadwick Smith; Andrew C Fry |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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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:
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Created Date: 2007-02-22 Completed Date: 2007-04-26 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 9415084 Medline TA: J Strength Cond Res Country: United States |
Other Details:
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Languages: eng Pagination: 73-6 Citation Subset: IM; S |
Affiliation:
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Department of Neurobiology and Anatomy, Wake Forest University, Winston-Salem, North Carolina 27157, USA. chadsmit@wfubmc.edu |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Adult Analysis of Variance Humans Knee* Male Muscle Contraction / physiology* Muscle, Skeletal / metabolism* Myosin Light Chains / metabolism* Phosphorylation |
| Chemical | |
Reg. No./Substance:
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0/Myosin Light Chains |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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