Journal of Comparative Physiology B

, Volume 162, Issue 8, pp 696–706

Body temperature and metabolic rate during natural hypothermia in endotherms

  • G. Heldmaier
  • T. Ruf
Article

DOI: 10.1007/BF00301619

Cite this article as:
Heldmaier, G. & Ruf, T. J Comp Physiol B (1992) 162: 696. doi:10.1007/BF00301619

Abstract

During daily torpor and hibernation metabolic rate is reduced to a fraction of the euthermic metabolic rate. This reduction is commonly explained by temperature effects on biochemical reactions, as described by Q10 effects or Arrhenius plots. This study shows that the degree of metabolic suppression during hypothermia can alternatively be explained by active downregulation of metabolic rate and thermoregulatory control of heat production. Heat regulation is fully adequate to predict changes in metabolic rate, and Q10 effects are not required to explain the reduction of energy requirements during hibernation and torpor.

Key words

Dally torporBody temperatureMetabolic rateHibernationHamster, Phodopus sungorus

Abbreviations

BMR

basal metabolic rate

BW

body weight

C

thermal conductance

CHL

thermal conductance as derived from HL

CHP

thermal conductance as derived from HP

HL

heat loss

HP

heat production

MR

metabolic rate

RQ

respiratory quotient

Ta

ambient temperature

Tb

body temperature

Copyright information

© Springer-Verlag 1992

Authors and Affiliations

  • G. Heldmaier
    • 1
  • T. Ruf
    • 1
  1. 1.Department of Biology, ZoologyPhilipps UniversitätMarburgFederal Republic of Germany