Changes in body temperature influence the scaling of V̇ O2 max and aerobic scope in mammals

James F. Gillooly, Andrew P. Allen

Research output: Contribution to journalArticlepeer-review

23 Citations (Scopus)

Abstract

Debate on the mechanism(s) responsible for the scaling of metabolic rate with body size in mammals has focused on why the maximum metabolic rate (V̇O2 max) appears to scale more steeply with body size than the basal metabolic rate (BMR). Consequently, metabolic scope, defined as V̇O2 max/BMR, systematically increases with body size. These observations have led some to suggest that V̇O2 max and BMR are controlled by fundamentally different processes, and to discount the generality of models that predict a single power-law scaling exponent for the size dependence of the metabolic rate. We present a model that predicts a steeper size dependence for V̇O2 max than BMR based on the observation that changes in muscle temperature from rest to maximal activity are greater in larger mammals. Empirical data support the model's prediction. This model thus provides a potential theoretical and mechanistic link between BMR and V̇O2 max.

Original languageEnglish
Pages (from-to)99-102
Number of pages4
JournalBiology Letters
Volume3
Issue number1
DOIs
Publication statusPublished - 22 Feb 2007
Externally publishedYes

Keywords

  • Allometry
  • Metabolic rate
  • Metabolic theory

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