Cited by 207Thermoregulation and physiological responsesBuilding Energy and Comfort OptimizationPhysiological and biochemical adaptations

Beyond the classic thermoneutral zone: Including thermal comfort

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Kingma, Boris RM, Frijns, Arjan JH, Schellen, Lisje, van Marken Lichtenbelt, Wouter D·2014·Temperature

Abstract

The thermoneutral zone is defined as the range of ambient temperatures where the body can maintain its core temperature solely through regulating dry heat loss, i.e., skin blood flow. A living body can only maintain its core temperature when heat production and heat loss are balanced. That means that heat transport from body core to skin must equal heat transport from skin to the environment. This study focuses on what combinations of core and skin temperature satisfy the biophysical requirements of being in the thermoneutral zone for humans. Moreover, consequences are considered of changes in insulation and adding restrictions such as thermal comfort (i.e. driver for thermal behavior). A biophysical model was developed that calculates heat transport within a body, taking into account metabolic heat production, tissue insulation, and heat distribution by blood flow and equates that to heat loss to the environment, considering skin temperature, ambient temperature and other physical parameters. The biophysical analysis shows that the steady-state ambient temperature range associated with the thermoneutral zone does not guarantee that the body is in thermal balance at basal metabolic rate per se. Instead, depending on the combination of core temperature, mean skin temperature and ambient temperature, the body may require significant increases in heat production or heat loss to maintain stable core temperature. Therefore, the definition of the thermoneutral zone might need to be reformulated. Furthermore, after adding restrictions on skin temperature for thermal comfort, the ambient temperature range associated with thermal comfort is smaller than the thermoneutral zone. This, assuming animals seek thermal comfort, suggests that thermal behavior may be initiated already before the boundaries of the thermoneutral zone are reached.

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  • The thermal comfort zone lies within the physiological thermoneutral zone and shares the same center.

    “With the introduction of the TNZ model it was also shown that the ”thermal comfort zone“ lies within the physiological thermoneutral zone, and that they share the same center [15].”
  • A thick subcutaneous fat layer increases insulation and attenuates heat exchange via the skin, which helps maintaining body core temperature in a cold environment.

    “a thick subcutaneous fat layer increases insulation and attenuates heat exchange via the skin, which helps maintaining body core temperature in a cold environment [15,68].”

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Authors
Kingma, B. R., Frijns, A. J., Schellen, L., & van Marken Lichtenbelt, W. D.
Affiliations
  • Maastricht University Medical Centre (NL)
  • Avans University of Applied Sciences (NL)
Corresponding author
Kingma, Boris RM
Venue
Temperature
Published
2014-07-08
Volume
1
Issue
2
Pages
142-149
ISSN
  • 2332-8940 (ISSN-L)
  • 2332-8959
OpenAlex
W2055591282
Cited by
207
References
27
Citations by year
2026: 15 · 2025: 14 · 2024: 26 · 2023: 20 · 2022: 29 · 2021: 21 · 2020: 13 · 2019: 18 · 2018: 15 · 2017: 12 · 2016: 12 · 2015: 9 · 2014: 2
FWCI
7.78
Type
journal article
Language
en
Open access
Licence
cc-by-nc
Locations
  • Temperature (publishedVersion, cc-by-nc)
  • PubMed Central (publishedVersion, cc-by-nc)
  • PubMed (publishedVersion)
  • TU/e Research Portal (publishedVersion, other-oa)
  • Research Publications (Maastricht University) (submittedVersion, other-oa)
  • TU/e Research Portal (submittedVersion, other-oa)
  • TU/e Research Portal (submittedVersion)
Topics
  • Health Sciences › Medicine › Physiology › Thermoregulation and physiological responses
  • Physical Sciences › Engineering › Building and Construction › Building Energy and Comfort Optimization
  • Physical Sciences › Environmental Science › Ecology › Physiological and biochemical adaptations
Keywords
thermoneutral zone, core body temperature, skin temperature, heat balance, heat transport, skin blood flow, metabolic heat production, thermal comfort, ambient temperature, thermal effects, biophysical model

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