Shirreffs, S. M., Aragon-Vargus, L. F., Chamorro, M., Maughan, R. J., Serratosa, L., & Zachwieja, J. J. (2003). Sweating response of elite professional soccer players. Medicine and Science in Sports and Exercise, 35(5), Supplement abstract 140.

Male professional soccer players (N = 26) were measured for sweat loss during the second training session of the day during warm to hot conditions (32 degrees Celsius; 20% relative humidity).

Fluids consumed during practice only partially replaced fluid and sodium and potassium losses.

Implication. While the ingestion of sufficient fluid and metabolite volume to totally replace that which is lost during exercise is not necessary, soccer coaches and players should monitor athletes' ingestion protocols to ensure that adequate replacement occurs during practices.

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