Drinking behavior and perception of thirst in untrained women during 6 weeks of heat acclimation and outdoor training.
The purposes of this study were to characterize measures of fluid intake and perception of thirst in women over a 6-week period of exercise-heat acclimation and outdoor training and examine if this lengthy acclimation period would result in changes in fluid intake that differ from those previously reported in men utilizing a shorter acclimation protocol of 8-10 days. Voluntary water intake (11-17 degrees C) and perception of thirst were measured in a group of 5 women (21-26 yr) undergoing exercise-heat acclimation for 90 min/day, 3 days/wk (36 degrees C, rh 50-70%) and outdoor training 3 days/wk for 6 weeks. Decreased drinking during acclimation was characterized by a decrease in the number of drinks (35 +/- 10 to 17 +/- 5; p <.05), greater time to first drink (9.9 +/- 2.0 to 23.1 +/- 4.7 min; p <.05), and a decrease in total volume ingested per week (3310 +/- 810 to 1849 +/- 446 ml; p <.05) through the 6-week study. Mean perceived thirst measurements remained low and showed only slight variance (3 +/- 0.4 to 5 +/- 0.4). These observations support a psycho-physiological response pattern different than that previously observed during 8-10 day acclimation protocols in men.
Ormerod
Jennifer K
JK
Department of Nutrition, Food, and Exercise Science at Florida State University, Tallahassee, FL 32306-1493, USA.
Elliott
Tabatha A
TA
Scheett
Timothy P
TP
VanHeest
Jaci L
JL
Armstrong
Lawrence E
LE
Maresh
Carl M
CM
D000064:Acclimatization / Q000502:physiology*; D000328:Adult; D001826:Body Fluids / Q000378:metabolism; D001833:Body Temperature Regulation; D003681:Dehydration / Q000503:physiopathology* / Q000523:psychology; D004326:Drinking / Q000502:physiology; D004327:Drinking Behavior / Q000502:physiology*; D015444:Exercise / Q000502:physiology* / Q000523:psychology; D005260:Female; D006358:Hot Temperature; D006801:Humans; D010101:Oxygen Consumption; D013546:Sweating / Q000502:physiology; D013894:Thirst / Q000502:physiology*