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Body temperature and metabolic rate during natural hypothermia in endotherms
Authors:G Heldmaier  T Ruf
Institution:(1) Department of Biology, Zoology, Philipps Universität, P.O.B. 1929, W-3550 Marburg, Federal Republic of Germany
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 Q 10 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 Q 10 effects are not required to explain the reduction of energy requirements during hibernation and torpor.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
Keywords:Dally torpor  Body temperature  Metabolic rate  Hibernation  Hamster  Phodopus sungorus
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