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

Autor(es)

Barroso, Renato ^[1] ; Roschel, Hamilton ^[1] ; Ugrinowitsch, Carlos ^[1] ; Araujo, Rubens ^[2] ; Nosaka, Kazunori ^[3] ; Tricoli, Valmor ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Sch Phys Educ & Sport, Sao Paulo - Brazil

^[2] Univ Sao Judas Tadeu, Sao Paulo - Brazil

^[3] Edith Cowan Univ, Churchlands, WA 6018 - Australia

• Tipo de documento: Artigo Científico
• Fonte: APPLIED PHYSIOLOGY NUTRITION AND METABOLISM; v. 35, n. 4, p. 534-540, AUG 2010.
• Citações Web of Science: 20

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. (AU)

• Processo FAPESP: 06/00267-3 - Respostas neuromusculares à realização de ações excêntricas em diferentes velocidades e sua influência no efeito da carga repetida
• Beneficiário: Valmor Alberto Augusto Tricoli
• Modalidade de apoio: Auxílio à Pesquisa - Regular