Effect of eccentric training on mitochondrial function and oxidative stress in the skeletal muscle of rats

• Main Authors: L.A. Silva, K.F. Bom, C.B. Tromm, G.L. Rosa, I. Mariano, B.G. Pozzi, T. Tuon, E.L. Stresck, C.T. Souza, R.A. Pinho
• Format: Article
• Language: English
• Published: Associação Brasileira de Divulgação Científica 2013-01-01
• Series: Brazilian Journal of Medical and Biological Research
• Subjects: Eccentric training; Mitochondrial enzyme activity; Oxidative stress; Muscle damage; Inflammation
• Online Access: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2013000100014&lng=en&tlng=en

The objective of the present study was to investigate the effects of eccentric training on the activity of mitochondrial respiratory chain enzymes, oxidative stress, muscle damage, and inflammation of skeletal muscle. Eighteen male mice (CF1) weighing 30-35 g were randomly divided into 3 groups (N = 6): untrained, trained eccentric running (16°; TER), and trained running (0°) (TR), and were submitted to an 8-week training program. TER increased muscle oxidative capacity (succinate dehydrogenase and complexes I and II) in a manner similar to TR, and TER did not decrease oxidative damage (xylenol and creatine phosphate) but increased antioxidant enzyme activity (superoxide dismutase and catalase) similar to TR. Muscle damage (creatine kinase) and inflammation (myeloperoxidase) were not reduced by TER. In conclusion, we suggest that TER improves mitochondrial function but does not reduce oxidative stress, muscle damage, or inflammation induced by eccentric contractions.