Background and Objectives: The purpose of this study was to investigate the effect of 14 days of beta-alanine supplementation on first and second ventilatory threshold of the men’s swimmers. Materials and Methods: Sixteen male swimmers were randomly divided into two groups, including supplementation (S ) and placebo (P). The supplementation group consumed beta-alanine vs control group consume dextrose for two weeks. The respiratory indices of subjects were measured using cardio pulmonary exercise testing.. Results: The results showed that β-alanine supplementation increased first and second ventilatory threshold (VT1 and VT2 respectively) in S group (p≤0.05). However, there was no significant difference between groups for VT2. Conclusion: Two weeks of beta-alanine supplementation with a dose of 2- 6 grams per day provides a sufficient stimulus to improve the competitive ability of swimmers.

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