Document Detail

Effect of fasting on the VO2-fh relationship in king penguins, Aptenodytes patagonicus.
MedLine Citation:
PMID:  15178544     Owner:  NLM     Status:  MEDLINE    
King penguins (Aptenodytes patagonicus) may fast for up to 30 days during their breeding period. As such extended fasting may affect the relationship between the rate of O(2) consumption (Vo(2)) and heart rate (f(H)), five male king penguins were exercised at various speeds on repeated occasions during a fasting period of 24-31 days. In addition, Vo(2) and f(H) were measured in the same animals during rest in cold air and water (4 degrees C). Vo(2) and f(H) at rest and Vo(2) during exercise decreased with fasting. There was a significant relation between Vo(2) and f(H) (r(2) = 0.56) that was improved by including speed, body mass (M(b)), number of days fasting (t), and a cross term between f(H) and t (r(2) = 0.92). It was concluded that there was a significant change in the Vo(2)-f(H) relationship with fasting during exercise. As t is measurable in the field and was shown to be significant and, therefore, a practical covariate, a regression equation for use when birds are ashore was obtained by removing speed and M(b). When this equation was used, predicted Vo(2) was in good agreement with the observed data, with an overall error of 3.0%. There was no change in the Vo(2)-f(H) relationship in penguins at rest in water.
A Fahlman; Y Handrich; A J Woakes; C-A Bost; R Holder; C Duchamp; P J Butler
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2004-06-03
Journal Detail:
Title:  American journal of physiology. Regulatory, integrative and comparative physiology     Volume:  287     ISSN:  0363-6119     ISO Abbreviation:  Am. J. Physiol. Regul. Integr. Comp. Physiol.     Publication Date:  2004 Oct 
Date Detail:
Created Date:  2004-09-16     Completed Date:  2004-10-20     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  100901230     Medline TA:  Am J Physiol Regul Integr Comp Physiol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  R870-7     Citation Subset:  IM    
School of Biosciences, The Univ. of Birmingham, Edgbaston, Birmingham B15 2TT, UK.
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MeSH Terms
Birds / physiology*
Body Weight / physiology
Carbon Dioxide / metabolism
Fasting / physiology*
Heart Rate / physiology*
Organ Size / physiology
Oxygen Consumption / physiology*
Physical Exertion / physiology
Respiratory Mechanics / physiology
Rest / physiology
Reg. No./Substance:
124-38-9/Carbon Dioxide

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

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