A study of the nycthemeral cycle of behavioural temperature regulation in man

The Journal of Physiology
M CabanacH Strempel

Abstract

1. Four human subjects were rendered hyperthermic and hypothermic by immersion in warm and cool water, at 02.00, 08.00, 14.00 and 20.00 hr. Bath and oesophageal temperatures and pulse rate were recorded. Temperature preference was determined by operant behaviour and vote. The core temperature set-point for behavioural thermoregulation was estimated from the behavioural results. 2. The results are in accord with those of previous studies of the nyethemeral cycling of autonomic responsiveness to heat and cold with a heating up phase before noon and a cooling down phase during the early night. 3. Subjective sensations and behavioural responses were also found to follow a nycthemeral cycle with a minimum before noon and a maximum at 20.00 hr. 4. The core temperature set point was 0-7 degrees C higher after noon than before noon with a small phase advance from resting core temperature. This result suggests that the nycthemeral cyclic change in body temperature is due to a nycthemeral cyclic change in the set-point near to which body temperature is kept by both autonomic and behavioural thermoregulatory responses.

Citations

Jan 1, 1987·European Journal of Applied Physiology and Occupational Physiology·B Nielsen
Jan 1, 1987·European Journal of Applied Physiology and Occupational Physiology·B Zahorska-Markiewicz, M Staszkiewicz
Jan 1, 1983·International Archives of Occupational and Environmental Health·M AttiaK Gumaa
Mar 1, 1992·Physiology & Behavior·R Refinetti, M Menaker
Jan 1, 1991·Pharmacology & Therapeutics·P H RedfernD S Minors
Jan 1, 1984·Neuroscience and Biobehavioral Reviews·M Attia
Mar 17, 2006·Journal of Applied Physiology·Michel Cabanac
Mar 1, 1992·Hepatology : Official Journal of the American Association for the Study of Liver Diseases·E GrauS Grisolía
Jan 1, 1980·International Archives of Occupational and Environmental Health·M AttiaG Hildebrandt
Nov 20, 2016·Temperature : Multidisciplinary Biomedical Journal·Zachary J SchladerBlair D Johnson
Oct 13, 2017·American Journal of Physiology. Regulatory, Integrative and Comparative Physiology·Zachary J SchladerBlair D Johnson

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