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| Research article summary (published 30 Jan 2002): |
Electromyographic comparison of standard and modified closed-chain isometric knee extension exercises.
Full Abstract
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.
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Author information
Author/s: Brindle, Timothy J (TJ); Nyland, John (J); Ford, Kevin (K); Coppola, Alfonse (A); Shapiro, Robert (R);
Affiliation: Biodynamics Laboratory, University of Kentucky, Lexington, Kentucky 40506, USA.
Journal and publication information
Publication Type: Clinical Trial; Comparative Study; Controlled Clinical Trial; Journal Article
Journal: Journal of strength and conditioning research / National Strength & Conditioning Association (J Strength Cond Res), published in United States. (Language: eng)
Reference: 2002-Feb; vol 16 (issue 1) : pp 129-34
Dates: Created 2002/02/08; Completed 2002/03/28; Revised 2006/11/15;
PMID: 11834118, status: MEDLINE (last retrieval date: 11/6/2008)
Sourced from the National Library of Medicine. Abstract text and other information may be subject to copyright.
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