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Results:

The mean age of subjects was 20.85±4.29 years. Sport performance (VO 2 max) significantly increased in l-arginine supplementation group (4.12±6.07) compared with placebo group (1.23±3.36)(P= 0.03). This increase remained significant even after adjustment of baseline values, physical activity and usual dietary intake of subjects throughout the study. No significant effect of l-arginine supplementation was found on weight, BMI, BFM and LBM.

Conclusions:

l-arginine supplementation (2 g per day) could increase the sport performance in male athletes, but had no effect on anthropometric measurements, including BMI, BFM and LBM. So, further studies are needed to shed light our findings.