Cited by 79Thermoregulation and physiological responsesCircadian rhythm and melatoninThermal Regulation in Medicine

Circadian changes in the sweating-to-vasoconstriction interthreshold range

Tayefeh, Farzin, Plattner, Olga, Sessler, D. I., Ikeda, Takehiko, Marder, Danielle·1998·Pfl�gers Archiv European Journal of Physiology

Abstract

Thermoregulatory defenses are characterized by thresholds, the core temperatures triggering each response. Core body temperature is normally maintained within the interthreshold range, temperatures between the sweating and vasoconstriction thresholds that do not trigger autonomic defenses. This range usually spans only some 0.2 degrees C, but it remains unknown whether similar precision is maintained during the circadian core temperature cycle of about 0.8 degrees C. Accordingly, we evaluated the interthreshold range at four times of the day. We studied ten male volunteers, each at 3 a.m., 8 a.m., 3 p.m., and 8 p.m. At least 12 h elapsed between tests, and the order was randomly assigned. At each study time, volunteers were warmed peripherally until sweating was observed. Skin temperature was subsequently kept constant while core temperature was decreased by central-venous infusion of ice-cold fluid until peripheral vasoconstriction was detected. The volunteers were not permitted to sleep during threshold determinations, although sleep was not otherwise controlled. The core temperature triggering an evaporative water loss of 40 g.m-2.h-1 identified the sweating threshold. Similarly, the vasoconstriction threshold was defined by the core temperature triggering the initial decreases in plethysmographic finger tip blood flow. The interthreshold range at 3 a.m. was twice that observed at the other study times (P<0.05). Our data suggest that autonomic control of body temperature is reduced at 3 a.m., even when sleep is denied. This result contradicts the general perception that circadian variation alters the thermoregulatory target temperature, but not precision of body temperature control.

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Crossref · 10.1007/s004240050530

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  • During the night, the internal temperature thresholds for sweating and vasodilation are lower than during the day, while differences between morning and afternoon are smaller.

    “During the night, the internal temperature thresholds for sweating and vasodilation have been shown to be lower than during the day, while the differences observed between the morning and the afternoon are smaller [1–3,51].”

    From Human thermal perception and time of day: A review (2021) · cites this paper as [51]

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Authors
Tayefeh, F., Plattner, O., Sessler, D. I., Ikeda, T., & Marder, D.
Affiliations
University of California, San Francisco (US)
Venue
Pfl�gers Archiv European Journal of Physiology
Published
1998-01-12
Volume
435
Issue
3
Pages
402-406
ISSN
  • 0031-6768 (ISSN-L)
  • 1432-2013
OpenAlex
W1978176246
Cited by
79
References
33
Citations by year
2026: 1 · 2025: 1 · 2024: 3 · 2023: 3 · 2022: 3 · 2021: 4 · 2020: 8 · 2019: 2 · 2018: 4 · 2017: 3 · 2016: 2 · 2015: 3 · 2014: 1 · 2013: 2 · 2012: 4
FWCI
1.64
Type
journal article
Language
en
Open access
closed
Locations
  • Pflügers Archiv - European Journal of Physiology (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Institutes of Health (5r01gm049670-04)
  • National Institute of General Medical Sciences (GM49670)
Topics
  • Health Sciences › Medicine › Physiology › Thermoregulation and physiological responses
  • Life Sciences › Neuroscience › Endocrine and Autonomic Systems › Circadian rhythm and melatonin
  • Health Sciences › Medicine › Critical Care and Intensive Care Medicine › Thermal Regulation in Medicine
Keywords
circadian rhythm, thermoregulation, sweating threshold, core body temperature, sleep deprivation, evaporative water loss
MeSH terms
Adult, Body Temperature, Body Temperature Regulation, Circadian Rhythm, Humans, Male, Skin Temperature, Sweating, Vasoconstriction

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