Thermoregulatory "overshoot" reactions in cold-adapted rats

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7 Citations (Scopus)

Abstract

(1) Resting core temperature (Tc) is lower, resting metabolic rate (MR) is higher in cold-adapted (CA) than non-adapted (NA) rats. (2) Tissue hypermetabolism of CA rats is balanced by skin vasodilatation; the net result is relatively low Tc. (3) Acute cold exposure of CA rats induces an "overshoot" MR-rise that exceeds actual needs and results in "paradoxical" Tc elevation throughout the exposure. In NA rats, comparable cold exposure causes Tc decline and a slow MR rise. (4) No initial Tc fall precedes the cold-induced MR rise of CA animals; i.e., peripheral cold sensors, that are more sensitive than in NA rats, induce the overshoot response.

Original languageEnglish
Pages (from-to)491-497
Number of pages7
JournalJournal of Thermal Biology
Volume26
Issue number4-5
DOIs
Publication statusPublished - Sep 12 2001

Keywords

  • Body temperature
  • Cold exposure
  • Cold-adaptation
  • Heat loss
  • Metabolic rate
  • Set-point
  • Thermal responsiveness
  • Thermoregulation

ASJC Scopus subject areas

  • Biochemistry
  • Physiology
  • Agricultural and Biological Sciences(all)
  • Developmental Biology

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