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- Title
Daily Fluid Turnover During Preseason Training in U.S. College Football.
- Authors
Stofan, John R.; Osterberg, Kris L.; Horswill, Craig A.; Lacambra, Magie; Eichner, E. Randy; Anderson, Scott A.; Murray, Robert
- Abstract
The authors measured 24-h fluid-turnover (FTO) rate during 6 d of preseason training in U.S. college football players. Players, training (T, n = 9, full gear and contact drills) and reference (R, n = 4, conditioning without gear or contact), ingested a deuterium oxide (D2O) dose and provided urine samples every 24 h for analysis of D2O. During one ∼2.3-h practice (wet-bulb globe temperature 24.6°C), body-mass change, urine production, and voluntary fluid intake were measured to calculate gross sweat loss (GSL). Average FTO was 10.3 ± 2.2 L/d for T and 7.0 ± 1.0 L/d for R. GSL was 3.4 ± 1.5 L for T and 1.7 ± 1.3 for R (P > 0.05). By Day 6, body mass decreased significantly in T (-2.4 ± 1.3 kg, P < 0.05) but not in R (0.38 ± 0.95 kg). With preseason training under moderate environmental stress, football players had high FTO and sweat rates, which might have contributed to a loss of body mass during preseason football training.
- Subjects
COLLEGE football; TRAINING of football players; REGULATION of body fluids; DEUTERIUM oxide; WATER in the body; PRESEASON (Sports); PHYSICAL education research; URINE; PERSPIRATION; DRINKING (Physiology)
- Publication
International Journal of Sport Nutrition & Exercise Metabolism, 2007, Vol 17, Issue 4, p340
- ISSN
1526-484X
- Publication type
Article
- DOI
10.1123/ijsnem.17.4.340