Effect of eccentric contraction velocity on muscle damage in repeated bouts of elbow flexor exercise


Autoria(s): Barroso, Renato; Roschel, Hamilton; Ugrinowitsch, Carlos; Araujo, Rubens; Nosaka, Kazunori; Tricoli, Valmor Alberto Augusto
Contribuinte(s)

UNIVERSIDADE DE SÃO PAULO

Data(s)

18/10/2012

18/10/2012

2010

Resumo

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 (group x bout x time). 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.

Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP)[2006/00267-3]

Identificador

APPLIED PHYSIOLOGY NUTRITION AND METABOLISM-PHYSIOLOGIE APPLIQUEE NUTRITION ET METABOLISME, v.35, n.4, p.534-540, 2010

1715-5312

http://producao.usp.br/handle/BDPI/17366

10.1139/H10-042

http://dx.doi.org/10.1139/H10-042

Idioma(s)

eng

Publicador

NATL RESEARCH COUNCIL CANADA-N R C RESEARCH PRESS

Relação

Applied Physiology Nutrition and Metabolism-physiologie Appliquee Nutrition Et Metabolisme

Direitos

restrictedAccess

Copyright NATL RESEARCH COUNCIL CANADA-N R C RESEARCH PRESS

Palavras-Chave #creatine kinase #maximal voluntary isometric contraction #muscle soreness #range of motion #eccentric exercise #SKELETAL-MUSCLE #HUMANS #MAGNITUDE #INJURY #FORCE #ADAPTATION #ANGLE #Physiology #Sport Sciences
Tipo

article

original article

publishedVersion