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Fractional nitric oxide in exhaled air (FENO) in youth elite soccer players before and after 8 wk of CM (squares) or placebo supplementation (circles). Open symbols represent atopic players, and closed symbols represent nonatopic players. Individual and mean values (with 95% confidence intervals) are shown. When atopic players only were analyzed, the P value for the within-group difference in the creatine group was 0.072.
