Document Detail


Integration of exercise response and allometric scaling in endotherms.
MedLine Citation:
PMID:  23328533     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
The relationship between heart beat frequency and the rate of oxygen consumption for different species of birds and mammals is influenced by body size, the type of exercise being undertaken and its intensity. Here a model is presented combining allometric scaling and exercise-induced variations in oxygen consumption and blood flow, when birds and mammals undergo their primary mode of locomotion. Novel relationships, common to the regulatory systems of all endotherms, are found to relate the rate of oxygen consumption, heart-rate, body and heart mass in 24 species of endotherms spanning 5 orders of body mass. We show that these relationships can be derived from linearity between heart-rate and the arteriovenous oxygen difference, present in data from exercise-attuned humans. We find that the metabolic rate of endotherms undergoing their primary mode of locomotion across a range of exercise intensities is quadratically related to heart-rate and that body mass is inferior to heart mass as a predictive scaling variable. The model facilitates graphical comparisons between species, and enables metabolic costs to be extrapolated from heart-rate data whenever direct measurements of oxygen consumption prove prohibitively challenging.
Authors:
Charles M Bishop; Robin J Spivey
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2013-1-15
Journal Detail:
Title:  Journal of theoretical biology     Volume:  -     ISSN:  1095-8541     ISO Abbreviation:  J. Theor. Biol.     Publication Date:  2013 Jan 
Date Detail:
Created Date:  2013-1-22     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0376342     Medline TA:  J Theor Biol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2013. Published by Elsevier Ltd.
Affiliation:
School of Biological Sciences, Bangor University, Deiniol Road, Gwynedd, LL57 2UW, UK. Electronic address: c.bishop@bangor.ac.uk.
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