Journal Title
Title of Journal: J Comp Physiol B
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Abbravation: Journal of Comparative Physiology B
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Publisher
Springer-Verlag
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Authors: Douglas Stewart Glazier
Publish Date: 2009/04/22
Volume: 179, Issue: 7, Pages: 821-828
Abstract
Metabolic rate is commonly thought to scale with body mass M to the 3/4 power However the metabolic scaling exponent b may vary with activity state as has been shown chiefly for interspecific relationships Here I use a metaanalysis of literature data to test whether b changes with activity level within species of ectothermic animals Data for 19 species show that b is usually higher during active exercise mean ± 95 confidence limits = 0918 ± 0038 than during rest 0768 ± 0069 This significant upward shift in b to near 1 is consistent with the metabolic level boundaries hypothesis which predicts that maximal metabolic rate during exercise should be chiefly influenced by volumerelated muscular power production scaling as M 1 This dependence of b on activity level does not appear to be a simple temperature effect because body temperature in ectotherms changes very little during exerciseI thank Shaun S Killen for providing me with unpublished data on study temperatures and bodymass ranges for Cyclopterus lumpus L Macrozoarces americanus Bloch and Schneider and Myoxocephalus scorpius L Jan Ohlberger for providing me with unpublished data on active metabolic rates in relation to body mass in the vendace Coregonus albula L James H Jones Hans Hoppeler and Ewald R Weibel for kindly allowing me to see their unpublished data on temporal changes in metabolic rate and body temperature in running horses and two anonymous reviewers for providing helpful comments on a previous version of this paper
Keywords:
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