Document Type : Research Paper I Open Access I Released under CC BY-NC 4.0 license


1 Corresponding author, Department of Sports Physiology, Faculty of Humanities, University of Kurdistan, Sanandaj, Iran.

2 Department of Sports Physiology, Faculty of Human Sciences, University of Kurdistan, Sanandaj, Iran.


Introduction: This study aimed to investigate the effect of Branched-Chain Amino Acid (BCAA) supplementation time on changes in the concentration of anabolic-catabolic hormones and muscle damage in trained individuals following acute resistance training.
Methods: In this quasi-experimental study with cross-sectional design, 11 active male athletes from Sanandaj sports clubs with a mean age of 32±6.9 years, height of  179.7±22.7 Cm, weight of 79.4±1.11Kg, and body mass index of 25.3 ± 3.8 Kg/m2  who had at least three regular training sessions during the week and had no history of taking supplement, were selected purposefully and then randomly subjected to four conditions (taking supplement/placebo 20 minutes before training and immediately after training). In the first session, half of the participants received three grams of BCAA supplements, and the other half received a placebo 20 minutes before resistance training. In the second session, the participants were subjected to opposite conditions. The conditions in the third and fourth sessions were different in that the time of taking the supplement was immediately after the end of resistance training. In each session, two blood samples were drawn before the beginning of the resistance program and again half an hour after the end of the training program to measure the studied variables.
Results: Analysis of variance with repeated measurements showed that BCAA supplementation does not significantly affect muscle damage indices (creatine kinase and lactate dehydrogenase) and does not change the serum concentration of testosterone, cortisol, and growth hormones.  
Conclusion: In general, the present findings show that the use of one dose of BCAA before and after the end of the resistance training protocol does not affect the changes in the concentration of anabolic-catabolic hormones and muscle damage.


Main Subjects

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