Document Detail

Runners Greatly Underestimate Sweat Losses Before and After 1 h Summer Run.
MedLine Citation:
PMID:  22805482     Owner:  NLM     Status:  Publisher    
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 y, VO2max = 57 ± 9 ml/kg/min) from the southeastern US completed an approximately 1 h run during late summer on a challenging outdoor road course (wet bulb globe temperature = 24.1 ± 1.5 °C). Runs began at ~6:45 am or pm. 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 < 0.01) between men (1797 ± 449 mL, 2.3 ± 0.6%) and women (1155 ± 258 mL, 1.9 ± 0.4%). Post-run estimates (738 ± 470 mL) were lower (p < 0.001) than sweat losses (1468 ± 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 post-run weight to assess sweat losses within the previous month (n = 9, -54 ± 18%) were no more accurate (p = 0.55) than runners who had not (n = 30, -48 ± 24%). These results suggest 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.
Eric O'Neal; Brett A Davis; Lauren K Thigpen; Christina R Caufield; Anthony D Horton; Joyce R McIntosh
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-7-4
Journal Detail:
Title:  International journal of sport nutrition and exercise metabolism     Volume:  -     ISSN:  1543-2742     ISO Abbreviation:  -     Publication Date:  2012 Jul 
Date Detail:
Created Date:  2012-7-18     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  100939812     Medline TA:  Int J Sport Nutr Exerc Metab     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Department of Health, Physical Education and Recreation, University of North Alabama, Florence, AL.
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