Faculty Scholarly Dissemination Grants


Hydration Strategies and Changes in Body Mass During Soccer Pre-Season Two-a-Days


Movement Science


College of Liberal Arts and Sciences

Date Range



Fluid loss and dehydration can negatively impact physical and skill performance, and potentially cause physical harm. PURPOSE: To monitor hydration strategies during, and changes in body mass as a result of pre-season soccer two-a-days. METHODS: 16 female DII soccer players volunteered, with four players monitored each day during linked morning and afternoon training sessions. Prior to each session, body mass (BM) and dry uniform weight were determined and core (intestinal) body temperature (Tint) and environmental conditions were measured. Participants were able to drink ad libitum water and/or Gatorade (6% carbohydrate sports drink). During each break between drills, Tint, heart rate (HR), and environmental conditions were recorded. At the end of each session, Tint, HR, BM, wet uniform weight and volumeof both fluids consumed were determined. Statistical analyses were performed on within- and between-session variables using paired t statistic. RESULTS: There were no substantial differences in either Tint or HR between sessions. More total fluid was consumed in morning compared to afternoon sessions (0.20 L, 90% CI 0.05 to 0.34 L), but there were no marked within or between session differences in volumeof specific fluid consumed. Net BM loss was greater in morning compared to afternoon sessions (mean difference = 0.37 kg, 90% CI 0.17 to 0.57 kg), which equated to 2.7±0.6% and 2.2±0.4% net BM loss, respectively. Overall, there was a net daily BM loss of 2.8±0.5 kg (4.4±0.7%). CONCLUSION: Hydration strategies used failed to offset the session-specific and daily body mass losses encountered during pre-season soccer two-a-days.

Conference Name

58th American College of Sports Medicine Annual Meeting

Conference Location

Denver, CO

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