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Cited by 12Thermoregulation and physiological responsesEffects of Environmental Stressors on LivestockBuilding Energy and Comfort Optimization

Ambient temperatures preferred by humans acclimated to heat given at a fixed daily time

Shido, Osamu, Sakurada, Sotaro, Sugimoto, Naotoshi, Hiratsuka, Yasuhiro, Takuwa, Yoh·2001·Physiology & Behavior
DOI 10.1016/s0031-9384(00)00428-5
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Abstract

We investigated preferred ambient temperatures (T(pref)) of heat-acclimated humans to assess their behavioral thermoregulation. Seven male volunteers were exposed to an ambient temperature (T(a)) of 42 degrees C and relative humidity (RH) of 40% for 4 h (14:00-18:00 h)/day for 9-10 consecutive days. Rectal temperature (T(re)) was measured, and T(pref) was determined at two distinct times of day, 09:00-11:00 h (AM test) and 14:00-16:00 h (PM test), in both heat- and nonheat-acclimated (control) conditions. Heat acclimation significantly decreased T(re) only in the PM test. There was no difference in the T(pref) between the two tests in the control condition. However, T(pref) in the PM test was significantly lower than that of the AM test in the heat-acclimated condition. The findings suggest that repeated heat exposure in humans for 4 h at a fixed time daily alters the core temperature level and behavioral thermoregulatory function, particularly during the period when the subjects had previously been exposed to heat.

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  • Among the 15 reviewed experimental studies investigating diurnal variations in thermal perception, one observed significant differences only for heat-acclimatized subjects.

    “the remaining one observed significant differences only for heat-acclimatized subjects [76]”

    From Human thermal perception and time of day: A review (2021) · cites this paper as [76]

  • In heat-acclimated subjects, preferred self-selected ambient temperature in the afternoon was significantly lower than in the morning.

    “The preferred self-selected ambient temperature in the afternoon was significantly lower than that of the morning in heat-acclimated subjects.”

    From Human thermal perception and time of day: A review (2021) · cites this paper as [76]

  • In non-heat-acclimated subjects, there was no difference in preferred temperature between morning and afternoon.

    “There was no difference in preferred temperature in the non-heat-acclimated subjects.”

    From Human thermal perception and time of day: A review (2021) · cites this paper as [76]

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Authors
Shido, O., Sakurada, S., Sugimoto, N., Hiratsuka, Y., & Takuwa, Y.
Affiliations
  • Shimane Medical University (JP)
  • Kanazawa University (JP)
ORCID
Venue
Physiology & Behavior
Publisher
Elsevier BV
Published
2001-02
Volume
72
Issue
3
Pages
387-392
ISSN
0031-9384 (ISSN-L)
DOI
10.1016/s0031-9384(00)00428-5
OpenAlex
W2052152917
Cited by
12
References
39
Citations by year
2026: 1 · 2025: 1 · 2023: 1 · 2021: 1 · 2019: 1 · 2016: 1 · 2015: 1 · 2014: 2
FWCI
0.40
Type
journal article
Language
en
Open access
closed
Licence
Locations
  • Physiology & Behavior (publishedVersion)
  • PubMed (publishedVersion)
Funders
Ministry of Education, Culture, Sports, Science and Technology (06404018, 07670079, 11670059)
Topics
  • Health Sciences › Medicine › Physiology › Thermoregulation and physiological responses
  • Life Sciences › Agricultural and Biological Sciences › Animal Science and Zoology › Effects of Environmental Stressors on Livestock
  • Physical Sciences › Engineering › Building and Construction › Building Energy and Comfort Optimization
Keywords
heat acclimation, behavioral thermoregulation, rectal temperature, core body temperature, time of day, heat exposure, thermal comfort, human thermoregulation
MeSH terms
Acclimatization, Body Temperature, Body Temperature Regulation, Heart Rate, Hot Temperature, Humans, Oxygen Consumption, Skin Temperature, Temperature, Time Factors

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