Document Detail

The effect of rate of cooling, time of day and light regime on the shivering response in rabbits.
MedLine Citation:
PMID:  1529728     Owner:  NLM     Status:  MEDLINE    
In man hypothermia exists when core temperature (Tc) falls below 35 degrees C. The onset of hypothermia is often insidious in that it can occur without any particular symptoms of serious discomfort. There is evidence that this decrease in thermosensitivity is most likely to occur when the rate of body cooling is slow. In addition there is some evidence that the susceptibility to become hypothermic varies with the circadian rhythm of Tc, particularly in animals maintained under constant light conditions. A systematic investigation has been carried out to determine whether the thermoregulatory response to body core cooling is affected by the rate of change of body temperature, the time of day at which the cooling takes place and/or by the light regime under which the animals are maintained. The investigation was made in rabbits maintained either under a 12-h light/dark (LD) cycle or under conditions of continuous light (LL). Thermosensitivity (relationship between falling Tc and the induced increase in metabolic heat production) was determined at two different rates of body cooling (1 degrees C decrease in core temperature in either 30 or 160 min.) and at different times of the day. A chronically implanted intravascular heat exchanger was used to extract heat from the animals. The results indicate that neither the rate of body cooling nor the time of day at which the cooling took place had any clear effect on the shivering response. Likewise there was no clear difference in the shivering response of the animals maintained under (LD) conditions as compared to those maintained under (LL) conditions.
H P Bergland; J B Mercer
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Acta physiologica Scandinavica     Volume:  145     ISSN:  0001-6772     ISO Abbreviation:  Acta Physiol. Scand.     Publication Date:  1992 Aug 
Date Detail:
Created Date:  1992-10-20     Completed Date:  1992-10-20     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  0370362     Medline TA:  Acta Physiol Scand     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  413-21     Citation Subset:  IM    
Department of Arctic Biology, University of Tromsø, Norway.
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MeSH Terms
Body Temperature / physiology
Circadian Rhythm / physiology*
Cold Temperature*
Esophagus / physiology
Hypothalamus / physiology
Regression Analysis
Shivering / physiology*

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