Document Detail

Electromyographic comparison of standard and modified closed-chain isometric knee extension exercises.
MedLine Citation:
PMID:  11834118     Owner:  NLM     Status:  MEDLINE    
The purpose of this study was to compare electromyographic (EMG) activity during open kinetic chain (OKC) and a modified closed kinetic chain (MCKC) knee extension exercises. Both OKC and closed kinetic chain (CKC) exercises provide benefits when devising conditioning programs; however, there are no exercises that combine the benefits of both exercises. Subjects performed maximum isometric knee extensions for both traditional OKC and MCKC knee extension exercises. Surface electrodes were placed on 8 lower-extremity muscles. One second of integrated EMG activity followed 95% maximal knee extension force. The following muscles demonstrated greater EMG activity during the MCKC vs. the OKC knee extension exercises: vastus medialis, medial hamstring, lateral hamstrings, and gluteus maximus. There was no difference between force output between the 2 conditions. This study demonstrates that modifications to traditional OKC exercises demonstrate some characteristics of CKC exercises, and therefore provide another avenue of rehabilitation or strengthening.
Timothy J Brindle; John Nyland; Kevin Ford; Alfonse Coppola; Robert Shapiro
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Publication Detail:
Type:  Clinical Trial; Comparative Study; Controlled Clinical Trial; Journal Article    
Journal Detail:
Title:  Journal of strength and conditioning research / National Strength & Conditioning Association     Volume:  16     ISSN:  1064-8011     ISO Abbreviation:  J Strength Cond Res     Publication Date:  2002 Feb 
Date Detail:
Created Date:  2002-02-08     Completed Date:  2002-03-28     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:  129-34     Citation Subset:  IM    
Biodynamics Laboratory, University of Kentucky, Lexington, Kentucky 40506, USA.
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MeSH Terms
Compressive Strength / physiology
Exercise / physiology*
Isometric Contraction / physiology*
Knee / physiology*
Leg / physiology
Muscle, Skeletal / physiology*
Physical Education and Training / methods

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

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