Abstract Purpose: Some studies have reported that β-alanine supplementation can increase high-intensity intermittent exercise performance and training adaptations. In this study, we investigated the effect of β-alanine on lactate acid and carnosine in trained wrestlers. Methods: 19 trained-wrestlers -mean age ± SD 22.52±2.31 yrs. height173.38 ± 4.86 cm, weight 76.22 ± 9.07 kg- participated in this design and randomly divided into supplementation -s- and placebo -P- groups. S group consumed 1000 mg β-alanine and P group consumed placebo for 2 weeks. Blood samples were taken, before the first and 6 minutes after the last HIIT test for detection of plasma lactate and carnosine. SPSS software and independent t-test method were used for analyzing data -p<0.05-. Results: The S group, taking β-alanine, showed a significant decrease in lactic acid -p=0.00- and a significant increase in carnosine plasma -p=0.02-, While these changes weren’t observed in the P group. Conclusion: According to the results, β-alanine supplementation for 2 weeks may be associated with increase buffering system via an increase in carnosine and decrease lactic acid during high-intensity interval training in wrestlers. We recommend that β-alanine supplementation may be useful for wrestling athletes.

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