Document Detail

Effect of eccentric contraction velocity on muscle damage in repeated bouts of elbow flexor exercise.
MedLine Citation:
PMID:  20725121     Owner:  NLM     Status:  MEDLINE    
Eccentric exercise induces muscle damage, but controversy exists concerning the effect of contraction velocity on the magnitude of muscle damage, and little is known about the effect of contraction velocity on the repeated-bout effect. This study examined slow (60 degrees.s(-1)) and fast (180 degrees.s(-1)) velocity eccentric exercises for changes in indirect markers of muscle damage following 3 exercise bouts that were performed every 2 weeks. Fifteen young men were divided into 2 groups based on the velocity of eccentric exercise: 7 in the Ecc60 (60 degrees.s(-1)) group, and 8 in the Ecc180 (180 degrees.s(-1)) group. The exercise consisted of 30 maximal eccentric contractions of the elbow flexors at each velocity, in which the elbow joint was forcibly extended from 60 degrees to 180 degrees (full extension) on an isokinetic dynamometer. Changes in maximal voluntary isometric contraction strength, range of motion, muscle soreness, and plasma creatine kinase activity before and for 4 days after the exercise were compared in the 2 groups using a mixed-model analysis (groupxboutxtime). No significant differences between groups were evident for changes in any variables following exercise bouts; however, the changes were significantly smaller (p<0.05) after the second and third bouts than after the first bout. These results indicate that the contraction velocity does not influence muscle damage or the repeated-bout effect.
Renato Barroso; Hamilton Roschel; Carlos Ugrinowitsch; Rubens Araújo; Kazunori Nosaka; Valmor Tricoli
Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Applied physiology, nutrition, and metabolism = Physiologie appliquée, nutrition et métabolisme     Volume:  35     ISSN:  1715-5312     ISO Abbreviation:  Appl Physiol Nutr Metab     Publication Date:  2010 Aug 
Date Detail:
Created Date:  2010-08-20     Completed Date:  2010-10-19     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101264333     Medline TA:  Appl Physiol Nutr Metab     Country:  Canada    
Other Details:
Languages:  eng     Pagination:  534-40     Citation Subset:  IM    
School of Physical Education and Sport, University of São Paulo, São Paulo, Brazil.
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MeSH Terms
Biological Markers / blood
Creatine Kinase / blood
Elbow Joint / physiopathology
Isometric Contraction*
Muscle Strength
Muscle, Skeletal / enzymology,  pathology,  physiopathology*
Muscular Diseases / blood,  etiology*,  pathology,  physiopathology
Pain / etiology
Range of Motion, Articular
Time Factors
Young Adult
Reg. No./Substance:
0/Biological Markers; EC Kinase

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