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Comparison of the effects of the prebiotic and synbiotic on athletic performance during the maximal oxygen uptake and constant load test in elite football players. Results are presented as mean ± SEM. PG: prebiotic group (n = 15); SG: synbiotic group (n = 15). (A) VO2max. (B) HRmax. (C) ER. *: p < 0.05; **: p < 0.01.
