Efeitos da suplementação de taurina sobre os parâmetros de estresse oxidativo muscular induzidos por exercício excêntrico / Efeitos da suplementação de taurina sobre os parâmetros de estresse oxidativo muscular induzidos por exercício excêntrico / Taurine supplementation effects on muscle oxidative stress induced by eccentric exercise / Taurine supplementation effects on muscle oxidative stress induced by eccentric exercise

AUTOR(ES)
DATA DE PUBLICAÇÃO

2009

RESUMO

This study was to investigate the effects of taurine supplementation on biomarkers of oxidative stress after eccentric exercise. Twenty four male rats Wistar were divided into the following groups (n=6): control (C); eccentric exercise (EE); eccentric exercise plus taurine (EET); eccentric exercise plus saline (EES). Taurine was administered with solution of 1ml water 300mg/Kg body weight (BW)/day by oral lavage, for two weeks before and 2, 12, 24 and 48 hours after the exercise session. The animals were submitted to one downhill run session with duration of 90 minutes and velocity constant of 16,6 m.min-1. Forty-eight hours after the exercise session, the animals were killed and the quadriceps muscle were surgically removed. Production of superoxide anion, lipoperoxidation, carbonylation, total thiol content and antioxidant enzyme were analyze. The results show the EET group had a significant reduction (p <0.05) in the production of superoxide anion (0,09 + 0.2 nmol / min / mg protein) when compared with the EE group (1.62 0.3 nmol / min / mg protein) and the EES group (1,55 0,3 nmol/ min/ mg protein). Lipid peroxidation was diminished as EET showed 0,13 0,001nmol/ mg protein of tiobarbituric acid reactive species (TBARS) significantly lower (p <0,05) than other groups (EES - 0,18 0,03 nmol/mg protein and EE - 0,18 0,05 nmol/mg protein). The total thiol content were higher (p <0,05) in EET (18,8 0,3 nmol TNB/ mg protein) when compared with EES (13,8 1 nmol TNB/ mg protein) and EE (12,2 1 nmol TNB/ mg protein). The EET group showed a lower value (p <0.05) of proteins carbonyl (0,20 0,2 nmol/ mg protein) compared to other groups (EES - 0,30 0,03 nmol/ mg protein and EE - 0,30 0,025 nmol/ mg protein). The activity of antioxidant enzymes superoxide dismutase (SOD) and catalase (CAT) had no significant difference (p <0.05) with supplementation of taurine. The values of SOD activity in the groups were: EE 1,22 0,25 U of SOD/ mg protein; EET 1,18 0,15 U of SOD / mg protein; EES 1,22 0,12 U of SOD / mg protein; and the values of CAT were: EE - 6,12 0,19 U of CAT/ mg protein; EET- 5,85 0,62 U of CAT/ mg protein; EES 5,61 0,45 U of CAT/ mg protein. In conclusion, the present study demonstrates that taurine supplementation decreased damage oxidative but did not affect antioxidant enzyme activity after eccentric exercise.

ASSUNTO(S)

ratos oxidative stress estresse oxidativo suplementação taurina educacao fisica supplementation exercício excêntrico rats eccentric exercise taurine

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