Document Detail

Maximal aerobic performance of deer mice in combined cold and exercise challenges.
MedLine Citation:
PMID:  14569409     Owner:  NLM     Status:  MEDLINE    
In nature, animals frequently need to deal with several physiological challenges simultaneously. We examined thermoregulatory performance (body temperature stability) and maximal oxygen consumption of deer mice (Peromyscus maniculatus) during intense exercise at room temperature, acute cold exposure, and exercise during cold exposure. Results with exercise and cold exposure alone were consistent with previous studies: there was little difference between maximal metabolism elicited by exercise alone or cold exposure alone in warm-acclimated mice; after cold acclimation (9 weeks at 5 degrees C), maximal exercise metabolism did not change but maximum thermogenic capacity increased by >60%. Warm acclimated animals did not increase maximal oxygen consumption when exercise was combined with moderate cold (0 degrees C) and had decreased maximal oxygen consumption when exercise was combined with severe cold (-16 degrees C). Combined cold and exercise also decreased thermoregulatory performance and exercise endurance time. Cold acclimation improved thermoregulatory performance in combined cold and exercise, and there was also a slight increase in endurance. However, as for warm-acclimated animals, maximal exercise metabolism did not increase at low temperatures. We interpret these results as an indication of competition between thermoregulatory and locomotor effectors (brown adipose tissue and skeletal muscle) under the combined challenges of cold exposure and maximal exercise, with priority given to the locomotor function.
M A Chappell; K A Hammond
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.     Date:  2003-10-21
Journal Detail:
Title:  Journal of comparative physiology. B, Biochemical, systemic, and environmental physiology     Volume:  174     ISSN:  0174-1578     ISO Abbreviation:  J. Comp. Physiol. B, Biochem. Syst. Environ. Physiol.     Publication Date:  2004 Jan 
Date Detail:
Created Date:  2004-01-21     Completed Date:  2004-09-30     Revised Date:  2009-06-08    
Medline Journal Info:
Nlm Unique ID:  8413200     Medline TA:  J Comp Physiol B     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  41-8     Citation Subset:  IM    
Department of Biology, University of California, Riverside, CA 92521, USA.
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MeSH Terms
Adipose Tissue, Brown / metabolism
Body Weights and Measures
Cold Temperature*
Muscle, Skeletal / metabolism
Oxygen Consumption / physiology
Peromyscus / physiology*
Physical Conditioning, Animal / physiology*

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