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Comparison of the effects of the prebiotic and synbiotic on the upper respiratory tract infection questionnaire during high-intensity training in elite football players. Results are presented as mean ± SEM. PG: prebiotic group (n = 15); SG: synbiotic group (n = 15). (A) Total number of symptoms occurring in all subjects per week. (B) Incidence of symptomatic subjects per week. (C) Duration of symptoms. *: p < 0.05; **: p < 0.01.
