Control of thermoregulatory sweating is altered by hydration level and exercise intensity
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.
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Dehydration diminishes the ability to dissipate body heat, and correct fluid reposition during exercise could diminish a possible EHS associated with exercise.
“Therefore, the dehydration diminish the ability to dissipate body heat and a correct fluid reposition during exercise could diminish a possible EHS associated to exercise [19].”
From Nutrition-Related Adverse Outcomes in Endurance Sports Competitions: A Review of Incidence and Practical Recommendations (2020) · cites this paper as [19]
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- Authors
- Montain, S. J., Latzka, W. A., & Sawka, M. N.
- Affiliations
- U.S. Army Research Institute of Environmental Medicine (US)
- ORCID
- Sawka, M. N.
- Venue
- Journal of Applied Physiology
- Publisher
- American Physiological Society
- Published
- 1995-11-01
- Volume
- 79
- Issue
- 5
- Pages
- 1434-1439
- ISSN
- 0161-7567 (ISSN-L)
- 8750-7587
- 1522-1601
- OpenAlex
- W1927765389
- Cited by
- 186
- References
- 0
- Citations by year
- 2026: 2 · 2025: 8 · 2024: 8 · 2023: 10 · 2022: 6 · 2021: 4 · 2020: 8 · 2019: 6 · 2018: 15 · 2017: 7 · 2016: 9 · 2015: 6 · 2014: 10 · 2013: 10 · 2012: 7
- FWCI
- 2.65
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Journal of Applied Physiology (publishedVersion)
- PubMed (publishedVersion)
- Topics
- Health Sciences › Medicine › Physiology › Thermoregulation and physiological responses
- Health Sciences › Medicine › Complementary and alternative medicine › Cardiovascular and exercise physiology
- Life Sciences › Agricultural and Biological Sciences › Animal Science and Zoology › Effects of Environmental Stressors on Livestock
- Keywords
- thermoregulatory sweating, hypohydration, exercise intensity, heat acclimation, fluid restriction, esophageal temperature, heat stress
- MeSH terms
- Adult, Body Temperature Regulation, Body Water, Humans, Male, Skin Temperature, Sweating, Exercise
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