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- Title
Runners Greatly Underestimate Sweat Losses Before and After a 1-hr Summer Run.
- Authors
O¿neal, Eric K.; Davis, Brett A.; Thigpen, Lauren K.; Caufield, Christina R.; Horton, Anthony D.; Mcintosh, Joyce R.
- Abstract
The purpose of this study was to determine how accurately runners estimate their sweat losses. Male (n = 19) and female (n = 20) runners (41 ± 10 yr, VO2max 57 ± 9 ml · kg-1 · min-1) from the southeastern U.S. completed an ~1-hr run during late summer on a challenging outdoor road course (wet bulb globe temperature 24.1 ± 1.5 °C). Runs began at ~6:45 a.m. or p.m. Before and after running, participants filled race-aid-station paper cups with a volume of fluid they felt would be equivalent to their sweat losses. Total sweat losses and losses by percent body weight differed (p < .01) between men (1,797 ± 449 ml, 2.3% ± 0.6%) and women (1,155 ± 258 ml, 1.9% ± 0.4%). Postrun estimates (738 ± 470 ml) were lower (p < .001) than sweat losses (1,468 ± 484 ml), equaling underestimations of 50% ± 23%, with no differences in estimation accuracy by percentage between genders. Runners who reported measuring changes in pre- and postrun weight to assess sweat losses within the previous month (n = 9, -54% ± 18%) were no more accurate (p = .55) than runners who had not (n = 30, -48% ± 24%). These results suggest that inadequate fluid intake during runs or between runs may stem from underestimations of sweat losses and that runners who do assess sweat-loss changes may be making sweat-loss calculation errors or do not accurately translate changes in body weight to physical volumes of water.
- Subjects
BODY composition; BODY weight; CALORIMETRY; DRINKING (Physiology); LONGITUDINAL method; PERSPIRATION; QUESTIONNAIRES; RUNNING; SELF-evaluation; SKINFOLD thickness; TEMPERATURE; STATISTICAL power analysis; OXYGEN consumption
- Publication
International Journal of Sport Nutrition & Exercise Metabolism, 2012, Vol 22, Issue 5, p353
- ISSN
1526-484X
- Publication type
Article
- DOI
10.1123/ijsnem.22.5.353