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| Research article summary (published 30 Oct 2002): |
Motor output is more variable during eccentric compared with concentric contractions.
Full Abstract
PURPOSE:
This study examined the ability of 10 young (25.3 +/- 2.8 yr) healthy individuals to control knee-extension force during several discrete concentric and eccentric contractions.
METHODS:
Subjects performed maximal and submaximal tasks on a KIN-COM isokinetic dynamometer. The submaximal tasks were to match a force-time parabola with a time to peak force of 200 ms at five target-forces (50, 100, 150, 200, and 250 N).
RESULTS:
Mean peak force produced by the subjects at each target-force during concentric and eccentric contractions was similar. Mean time to peak force, however, was much shorter for eccentric contractions and was not influenced by increases in the level of force. The standard deviation (SD) and coefficient of variation (CV) of peak force was greater during eccentric compared with concentric contractions. The SD of time to peak force was greater for concentric contractions; however, when normalized to the mean time to peak force produced (CV), eccentric contractions were more variable.
CONCLUSIONS:
Results provide evidence that even in young adults the control of motor output is different for eccentric compared with concentric contractions.
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Author information
Author/s: Christou, Evangelos A (EA); Carlton, Les G (LG);
Affiliation: Department of Kinesiology, University of Illinois at Urbana-Champaign, USA. echristo(-atsign-)colorado.edu
Journal and publication information
Publication Type: Clinical Trial; Comparative Study; Journal Article
Journal: Medicine and science in sports and exercise (Med Sci Sports Exerc), published in United States. (Language: eng)
Reference: 2002-Nov; vol 34 (issue 11) : pp 1773-8
Dates: Created 2002/11/19; Completed 2003/03/06; Revised 2006/11/15;
PMID: 12439082, 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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