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Cited by 90Thermoregulation and physiological responsesCardiovascular and exercise physiologyEffects of Environmental Stressors on Livestock

Effects of Short-term Exercise in the Heat on Thermoregulation, Blood Parameters, Sweat Secretion and Sweat Composition of Tropic-dwelling Subjects

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Saat, Mohamed, Sirisinghe, Roland Gamini, Singh, Rabindarjeet, Tochihara, Yutaka·2005·Journal of PHYSIOLOGICAL ANTHROPOLOGY and Applied Human Science
DOI 10.2114/jpa.24.541
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Abstract

This study investigates the effects of a short-term aerobic training program in a hot environment on thermoregulation, blood parameters, sweat secretion and composition in tropic-dwellers who have been exposed to passive heat. Sixteen healthy Malaysian-Malay male volunteers underwent heat acclimation (HA) by exercising on a bicycle ergometer at 60% of VO2max for 60 min each day in a hot environment (Ta: 31.1+/-0.1 degrees C, rh: 70.0+/-4.4%) for 14 days. All parameters mentioned above were recorded on Day 1 and at the end of HA (Day 16). On these two days, subjects rested for 10 min, then cycled at 60% of VO2max for 60 min and rested again for 20 min (recovery) in an improvised heat chamber. Rectal temperature (Tre), mean skin temperature (Tsk) heart rate (HR), ratings of perceived exertion (RPE), thermal sensation (TS), local sweat rate and percent dehydration were recorded during the test. Sweat concentration was analysed for sodium [Na+]sweat and potassium. Blood samples were analysed for biochemical changes, electrolytes and hematologic indices. Urine samples were collected before and after each test and analysed for electrolytes.After the period of acclimation the percent dehydration during exercise significantly increased from 1.77+/-0.09% (Day 1) to 2.14+/-0.07% (Day 16). Resting levels of hemoglobin, hematocrit and red blood cells decreased significantly while [Na+]sweat increased significantly. For Tre and Tsk there were no differences at rest. Tre, HR, RPE, TS, plasma lactate concentration, hemoglobin and hematocrit at the 40th min of exercise were significantly lower after the period of acclimation but mean corpuscular hemoglobin and serum osmolality were significantly higher while no difference was seen in [Na+]sweat and Tsk. It can be concluded that tropic-dwelling subjects, although exposed to prolonged passive heat exposure, were not fully heat acclimatized. To achieve further HA, they should gradually expose themselves to exercise-heat stress in a hot environment.

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  • Partial acclimation occurs with passive heat stress or exercise training, but full heat acclimation requires exposure to both exercise and heat stress.

    “Partial acclimation occurs with passive heat stress or exercise training, but exposure to both exercise and heat stress is required to achieve full heat acclimation (Saat et al. 2005; Tipton et al. 2008).”

    From Physiological mechanisms determining eccrine sweat composition (2020) · cites this paper as Saat et al. 2005

    The Introduction (page unavailable) says passive heat exposure can produce some degree of heat acclimation. The Abstract (page unavailable) concludes that the tropic-dwelling subjects were not fully acclimatized despite prolonged passive exposure and recommends exercise in the heat for further acclimation. The paper does not establish that exercise training alone produces partial acclimation or that combining exercise and heat is universally required for full acclimation. (LLM, conf=0.82)

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Research works printed but not linked: 1

  1. Wenger CB (1988) Human heat acclimatization. In Pandolf KB, Sawka MN, Gonzalez RR eds. Human performance physiology and environment medicine at terrestrial extremes. Benchmark Press, Indianapolis, 153-198

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Authors
Saat, M., Sirisinghe, R. G., Singh, R., & Tochihara, Y.
Affiliations
  • Universiti Sains Malaysia (MY)
  • Kyushu University (JP)
ORCID
Tochihara, Yutaka
Venue
Journal of PHYSIOLOGICAL ANTHROPOLOGY and Applied Human Science
Publisher
Japan Society of Physiological Anthropology
Published
2005
Volume
24
Issue
5
Pages
541-549
ISSN
  • 1345-3475 (ISSN-L)
  • 1347-5355
DOI
10.2114/jpa.24.541
OpenAlex
W2034194018
Cited by
90
References
53
Citations by year
2026: 2 · 2025: 3 · 2024: 2 · 2023: 2 · 2022: 7 · 2021: 2 · 2020: 8 · 2019: 5 · 2018: 6 · 2017: 4 · 2016: 6 · 2015: 3 · 2014: 4 · 2013: 5 · 2012: 10
FWCI
1.38
Type
journal article
Language
en
Open access
Locations
  • Journal of PHYSIOLOGICAL ANTHROPOLOGY and Applied Human Science (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • Universiti Sains Malaysia
  • Japan Society for the Promotion of Science (16107006)
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
heat acclimation, thermoregulation, sweat secretion, sweat composition, dehydration, rectal temperature, skin temperature, plasma lactate, serum osmolality, hemoglobin, hematocrit, exercise in the heat
MeSH terms
Acclimatization, Adolescent, Blood Chemical Analysis, Body Temperature, Body Temperature Regulation, Heart Rate, Humans, Malaysia, Potassium, Sodium, Sweat, Sweating, Temperature, Tropical Climate, Exercise, Statistics, Nonparametric

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