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24-H HYDRATION BEHAVIORS DURING ONCE VERSUS TWICE PER DAY COLLEGIATE SOCCER PRACTICES IN HOT-HUMID CONDITIONS

Abstract

Tate M. Dean1, Savannah N. Knight2, Marcus Robinson1, Angela R. Russell1, Eric K. O'Neal2, Brett A. Davis1. 1Auburn University at Montgomery, Montgomery, AL. 2University of North Alabama, Florence, AL.

BACKGROUND: This field study evaluated 24-h hydration parameters among collegiate, male soccer players (n = 17) in a high heat stress environment. The observation types included a pre-season training camp twice per day (morning and afternoon) practice scenario (X2) and a regular season once per day morning practice and afternoon team meeting scenario (X1). METHODS: Observations began prior to morning practice and ended at the start of the next morning practice. Urine specific gravity (USG) and body mass were assessed before morning practices, before afternoon practice (X2)/pre- team meeting (X1), and before next morning practice. All beverage fluid intake, practice sweat volume, and urinary losses were assessed during each 24-h window. RESULTS: Sweat losses differed (p < 0.05) among all 3 practices, but players’ ad libitum fluid intake offset large fluid deficits during practices. X2 sweat loss and fluid intake were 2.181 ± 0.693/1.823 ± 0.757 L and 1.710 ± 0.474/0.922 ± 0.569 for morning and afternoon practices, respectively. X1 morning practice sweat loss and practice fluid intake were 3.361± 0.956 and 2.190 ± 0.524 L. Mean fluid shifts were more negative for X1 from the start of morning practice day 1to the start of afternoon practice (X2) or team meeting (X1) (X 1 = -0.304 ± 0.675; X2 = 0.446 ± 0.916 L, p = 0.004) but not from the start of morning practice day 1 to start of morning practice day 2 (X1 = 0.664 ± 1.051; X2 = 0.479 ± 0.856, p = 0.52). USG and body mass remained stable an did not exhibit significant main effects for data collection time point. CONCLUSIONS: Ad libitum practice and recovery fluid intake was sufficient to maintain euhydration for the majority of players during both practice scenarios. X2 conditions prompted greater fluid consumption before the second practice of the day.

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