Document Detail


Effects of eccentric versus concentric training on thigh muscle strength and EMG.
MedLine Citation:
PMID:  15643534     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The purpose of this study was to compare pure eccentric and concentric strength training regarding possible specific effects of muscle action type on neuromuscular parameters, such as a decreased inhibition during maximal voluntary eccentric actions. Two groups of young healthy adult men performed 10 weeks of either eccentric or concentric unilateral isokinetic knee extensor training at 90 degrees.s(-1), 4 sets of 10 maximal efforts, 3 days a week. Knee extensor torque and surface EMG from the quadriceps and hamstring muscle groups were collected and quantified in a window between 30 and 70 degrees knee angle (range of motion 90-5 degrees ) during maximal voluntary eccentric and concentric knee extensor actions at 30, 90, and 270 degrees.s(-1). Changes in strength of the trained legs revealed more signs of specificity related to velocity and contraction type after eccentric than concentric training. No major training effects were present in eccentric to concentric ratios of agonist EMG or in relative antagonist (hamstring) activation. Thus, for the trained leg, the muscle action type and speed specific changes in maximal voluntary eccentric strength could not be related to any effects on neural mechanisms, such as a selective increase in muscle activation during eccentric actions. Interestingly, with both types of training there were specific cross-education effects, that is, action type and velocity specific increases in strength occurred in the contralateral, untrained, leg, accompanied by a specific increase in eccentric to concentric EMG ratio after eccentric training.
Authors:
J Y Seger; A Thorstensson
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Publication Detail:
Type:  Clinical Trial; Comparative Study; Journal Article; Randomized Controlled Trial; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  International journal of sports medicine     Volume:  26     ISSN:  0172-4622     ISO Abbreviation:  Int J Sports Med     Publication Date:    2005 Jan-Feb
Date Detail:
Created Date:  2005-01-11     Completed Date:  2005-05-26     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  8008349     Medline TA:  Int J Sports Med     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  45-52     Citation Subset:  IM    
Affiliation:
Department of Sport and Health Sciences, University College of Physical Education and Sports, Karolinska Institutet, Stockholm, Sweden. jan.seger@neuro.ki.se
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MeSH Terms
Descriptor/Qualifier:
Adaptation, Physiological / physiology*
Adult
Electromyography
Exercise / physiology*
Humans
Knee / physiology
Male
Muscle, Skeletal / physiology*
Physical Education and Training / methods*
Thigh
Torque

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


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