Document Detail

Energetic cost of locomotion as a function of ambient temperature and during growth in the marsupial Potorous tridactylus.
MedLine Citation:
PMID:  8440970     Owner:  NLM     Status:  MEDLINE    
In the marsupial, the potoroo, multiple regression analysis shows that ambient temperature makes a minor (2%) contribution towards variation in oxygen consumption with speed. This suggests that the heat generated during running is substituted for heat which would otherwise have to be generated for temperature regulation. Maximum levels of oxygen consumption are also temperature-independent over the range 5-25 degrees C, but plasma lactate concentrations at the conclusion of exercise significantly increase with ambient temperature. Adult potoroos show a linear increase in oxygen consumption with speed, and multiple regression indicates that the most significant factor affecting energy use during running is stride length. Juvenile potoroos have an incremental cost of locomotion about 40% lower than that predicted on the basis of body mass. The smaller animals meet the demands of increasing speed by increasing stride length rather than stride frequency, as would be expected in a smaller species. Our results show that juvenile potoroos diverge significantly from models based only on adult animals in incremental changes in stride frequency, length and the cost of transport, suggesting that they are not simply scaled-down adults.
R V Baudinette; E A Halpern; D S Hinds
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  The Journal of experimental biology     Volume:  174     ISSN:  0022-0949     ISO Abbreviation:  J. Exp. Biol.     Publication Date:  1993 Jan 
Date Detail:
Created Date:  1993-03-26     Completed Date:  1993-03-26     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0243705     Medline TA:  J Exp Biol     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  81-95     Citation Subset:  IM    
School of Biological Sciences, Flinders University, Adelaide, South Australia.
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MeSH Terms
Aging / metabolism
Body Constitution
Body Temperature Regulation / physiology
Energy Metabolism
Locomotion / physiology*
Oxygen Consumption

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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