Efeito de diferentes bebidas esportivas sobre marcadores de dano muscular após treino controlado de rúgbi

Abstract

The muscle damage caused by high-intensity exercises results in extravasation of proteins to the bloodstream, prolonging the recovery time of the athlete. Strategies that seek to attenuate muscle damage are frequently used, especially the use of sports drinks containing carbohydrates (CHO) and CHO+proteins. The present study aimed to compare the effect of consumption of sports drinks containing CHO, whey protein (WP)+CHO, branched chain amino acids (BCAA)+CHO and flavored placebo (PLA) containing aspartame, on markers of muscle damage. In a randomized, double-blind and placebo-controlled study with repeated measures, seven college players completed four controlled rugby training (CRT) lasting 90 min and separated by 72 h, and consumed, PLA, CHO (1.2 g/kg CHO), WP+CHO (0.4 g/kg WP with additional energy from CHO) and BCAA+CHO drink (0.35 g/kg BCAA with additional of CHO). Before (Pre), immediately after (Post), and 6 h, 12 h and 24 h after the CRT, blood samples were taken for analysis of creatine kinase (CK), lactate dehydrogenase (LDH) and conducting of three countermovement vertical jumps (CMVJ) and CMVJ for 30 seconds tests to measure power (w) and relative power (w/kg), number of jumps (NJ30s) and height achieved, and Test T (TT) to measure agility. There was a significant effect for the time factor (p <0.05) in all variables, except the NJ30s. For TT, there was significant interaction time/treatment (p <0.05), revealing better performance for those who consumed BCAA+CHO. Consumption of beverages containing CHO, WP+CHO or BCAA+CHO during CRT doesn't seem to promote additional benefits compared to PLA on markers of muscle damage, but consumption of BCAA+CHO seems to contribute with faster recovery of agility..