Document Detail

Energy cost and thermoregulation of unrestrained rats during exercise in the cold.
MedLine Citation:
PMID:  8925427     Owner:  NLM     Status:  MEDLINE    
The effect of cold ambient temperature on the energy cost and thermoregulation during exercise was studied in 18 male Sprague-Dawley rats accustomed to running for 2 weeks. For measuring T(b) and ensuring an unrestrained exercise performance, the rats were implanted with intraperitoneal telemetric radio transmitters. The rats ran at three submaximal exercise intensities (10, 15 and 20 m.min-1) at different T(a) values (22 degrees, 0 degree, -10 degrees and -20 degrees C) for 30 min. VO2 and Tb were continuously measured. During exercise at 0 degree C a 100% substitution of thermoregulatory heat production by exercise thermogenesis was observed. At T(a) values below 0 degree C the physical strain of exercise increased considerably: Vo2 increased 34-61% at -10 degrees C and 51% at -20 degrees C compared to the corresponding exercise intensity at T(a) 22 degrees C. A partial substitution of thermoregulatory heat production by exercise thermogenesis was observed in the cold. At -10 degrees C the cost for thermoregulation during exercise was 28% and at -20 degrees C 31% lower than at rest at the corresponding T(a) values. The rat could not maintain normal Tb during exercise below 0 degrees C. The T(b) dropped 1.5-1.8 degrees C at -10 degrees C and 2.5 degrees C at -20 degrees C. It is concluded that exercising below 0 degree C at submaximal levels (below 50% of VO2max) partially substitutes for thermoregulatory costs but is thermally unfavorable for the small-sized rat.
T Mäkinen; H Rintamäki; E Hohtola; R Hissa
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Comparative biochemistry and physiology. Part A, Physiology     Volume:  114     ISSN:  1096-4940     ISO Abbreviation:  Comp. Biochem. Physiol. A Physiol.     Publication Date:  1996 May 
Date Detail:
Created Date:  1996-11-27     Completed Date:  1996-11-27     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  9516062     Medline TA:  Comp Biochem Physiol A Physiol     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  57-63     Citation Subset:  IM    
Department of Biology, University of Oulu, Finland.
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MeSH Terms
Body Temperature / physiology*
Body Temperature Regulation / physiology*
Cold Temperature
Energy Metabolism*
Oxygen Consumption
Physical Conditioning, Animal / physiology*
Rats, Sprague-Dawley

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