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Effect of hypohydration on core temperature during exercise in temperate and hot environments.
Pflugers Arch. 2000 Jul; 440(3):476-80.PA

Abstract

The purpose of this study was to compare directly the physiological consequences of 5% hypohydration or euhydration during exercise in both temperate (23 degrees C) and hot (33 degrees C) environments. The subjects were eight male volunteers. Each performed four 1-h exercise bouts at 60% maximum oxygen uptake, one in each of the following conditions: hot-hypohydrated, hot-euhydrated, temperate-hypohydrated, and temperate-euhydrated. Heart rate (HR), rectal temperature (Tre), forearm blood flow, and oxygen uptake were measured after 20, 40, and 60 min exercise. Whole-body sweat rate was also determined for each exercise bout. Hypohydration increased Tre significantly (P<0.05) more in the hot environment (0.16 degrees C per 1% decrease in body mass) than in the temperate environment (0.08 degrees C per 1% hypohydration). Furthermore, compared with euhydration, hypohydration decreased forearm blood flow and whole-body sweat rate significantly more during exercise in the hot than in the temperate environment. The reductions in forearm blood flow and whole-body sweat rate appear to have decreased heat loss, thus accounting for the increase in Tre during exercise in the heat while hypohydrated. In conclusion, this study illustrates that the physiological consequences of hypohydration during exercise are exacerbated in the heat.

Authors+Show Affiliations

Department of Exercise and Nutritional Sciences, San Diego State University, CA 92182, USA.No affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

10954335

Citation

Buono, M J., and A J. Wall. "Effect of Hypohydration On Core Temperature During Exercise in Temperate and Hot Environments." Pflugers Archiv : European Journal of Physiology, vol. 440, no. 3, 2000, pp. 476-80.
Buono MJ, Wall AJ. Effect of hypohydration on core temperature during exercise in temperate and hot environments. Pflugers Arch. 2000;440(3):476-80.
Buono, M. J., & Wall, A. J. (2000). Effect of hypohydration on core temperature during exercise in temperate and hot environments. Pflugers Archiv : European Journal of Physiology, 440(3), 476-80.
Buono MJ, Wall AJ. Effect of Hypohydration On Core Temperature During Exercise in Temperate and Hot Environments. Pflugers Arch. 2000;440(3):476-80. PubMed PMID: 10954335.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Effect of hypohydration on core temperature during exercise in temperate and hot environments. AU - Buono,M J, AU - Wall,A J, PY - 2000/8/23/pubmed PY - 2001/2/28/medline PY - 2000/8/23/entrez SP - 476 EP - 80 JF - Pflugers Archiv : European journal of physiology JO - Pflugers Arch VL - 440 IS - 3 N2 - The purpose of this study was to compare directly the physiological consequences of 5% hypohydration or euhydration during exercise in both temperate (23 degrees C) and hot (33 degrees C) environments. The subjects were eight male volunteers. Each performed four 1-h exercise bouts at 60% maximum oxygen uptake, one in each of the following conditions: hot-hypohydrated, hot-euhydrated, temperate-hypohydrated, and temperate-euhydrated. Heart rate (HR), rectal temperature (Tre), forearm blood flow, and oxygen uptake were measured after 20, 40, and 60 min exercise. Whole-body sweat rate was also determined for each exercise bout. Hypohydration increased Tre significantly (P<0.05) more in the hot environment (0.16 degrees C per 1% decrease in body mass) than in the temperate environment (0.08 degrees C per 1% hypohydration). Furthermore, compared with euhydration, hypohydration decreased forearm blood flow and whole-body sweat rate significantly more during exercise in the hot than in the temperate environment. The reductions in forearm blood flow and whole-body sweat rate appear to have decreased heat loss, thus accounting for the increase in Tre during exercise in the heat while hypohydrated. In conclusion, this study illustrates that the physiological consequences of hypohydration during exercise are exacerbated in the heat. SN - 0031-6768 UR - https://www.unboundmedicine.com/medline/citation/10954335/Effect_of_hypohydration_on_core_temperature_during_exercise_in_temperate_and_hot_environments_ L2 - https://dx.doi.org/10.1007/s004240000298 DB - PRIME DP - Unbound Medicine ER -