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Control of thermoregulatory sweating is altered by hydration level and exercise intensity.
J Appl Physiol (1985). 1995 Nov; 79(5):1434-9.JA

Abstract

The purpose of this study was to examine the thermoregulatory sweating control parameters of threshold temperature and sensitivity to determine whether 1) these variables were altered by hypohydration level and exercise intensity and 2) these alterations, if present, were additive and independent. Nine heat-acclimated men completed a matrix of nine trials: three exercise intensities of 25, 45, and 65% maximal O2 uptake and three hydration levels, i.e., euhydration and hypohydration (Hy) at 3 and 5% of body weight. During each trial, subjects attempted 50 min of treadmill exercise in a warm room (30 degrees C dry bulb, 50% relative humidity) while esophageal temperature and upper arm sweating rate were continuously measured. Hypohydration was achieved by exercise and fluid restriction the day preceding the trials. The following new findings were made: 1) threshold temperature increased in graded manner with hypohydration level (approximately 0.06 degree C/% Hy); 2) sensitivity decreased in a graded manner with hypohydration level (approximately 0.06 units/%Hy); 3) threshold temperature was not altered by exercise intensity; and 4) sensitivity increased from low- to moderate- and high-intensity exercise. We conclude that both hypohydration level and exercise intensity produce independent effects on control of thermoregulatory sweating.

Authors+Show Affiliations

Thermal Physiology and Medicine Division, United States Army Research Institute of Environmental Medicine, Natick, Massachusetts 01760, USA.No affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

8593998

Citation

Montain, S J., et al. "Control of Thermoregulatory Sweating Is Altered By Hydration Level and Exercise Intensity." Journal of Applied Physiology (Bethesda, Md. : 1985), vol. 79, no. 5, 1995, pp. 1434-9.
Montain SJ, Latzka WA, Sawka MN. Control of thermoregulatory sweating is altered by hydration level and exercise intensity. J Appl Physiol (1985). 1995;79(5):1434-9.
Montain, S. J., Latzka, W. A., & Sawka, M. N. (1995). Control of thermoregulatory sweating is altered by hydration level and exercise intensity. Journal of Applied Physiology (Bethesda, Md. : 1985), 79(5), 1434-9.
Montain SJ, Latzka WA, Sawka MN. Control of Thermoregulatory Sweating Is Altered By Hydration Level and Exercise Intensity. J Appl Physiol (1985). 1995;79(5):1434-9. PubMed PMID: 8593998.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Control of thermoregulatory sweating is altered by hydration level and exercise intensity. AU - Montain,S J, AU - Latzka,W A, AU - Sawka,M N, PY - 1995/11/1/pubmed PY - 1995/11/1/medline PY - 1995/11/1/entrez SP - 1434 EP - 9 JF - Journal of applied physiology (Bethesda, Md. : 1985) JO - J Appl Physiol (1985) VL - 79 IS - 5 N2 - The purpose of this study was to examine the thermoregulatory sweating control parameters of threshold temperature and sensitivity to determine whether 1) these variables were altered by hypohydration level and exercise intensity and 2) these alterations, if present, were additive and independent. Nine heat-acclimated men completed a matrix of nine trials: three exercise intensities of 25, 45, and 65% maximal O2 uptake and three hydration levels, i.e., euhydration and hypohydration (Hy) at 3 and 5% of body weight. During each trial, subjects attempted 50 min of treadmill exercise in a warm room (30 degrees C dry bulb, 50% relative humidity) while esophageal temperature and upper arm sweating rate were continuously measured. Hypohydration was achieved by exercise and fluid restriction the day preceding the trials. The following new findings were made: 1) threshold temperature increased in graded manner with hypohydration level (approximately 0.06 degree C/% Hy); 2) sensitivity decreased in a graded manner with hypohydration level (approximately 0.06 units/%Hy); 3) threshold temperature was not altered by exercise intensity; and 4) sensitivity increased from low- to moderate- and high-intensity exercise. We conclude that both hypohydration level and exercise intensity produce independent effects on control of thermoregulatory sweating. SN - 8750-7587 UR - https://www.unboundmedicine.com/medline/citation/8593998/Control_of_thermoregulatory_sweating_is_altered_by_hydration_level_and_exercise_intensity_ L2 - https://journals.physiology.org/doi/10.1152/jappl.1995.79.5.1434?url_ver=Z39.88-2003&rfr_id=ori:rid:crossref.org&rfr_dat=cr_pub=pubmed DB - PRIME DP - Unbound Medicine ER -