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First published online October 7, 2008
Journal of Experimental Biology 211, 3258-3265 (2008)
Published by The Company of Biologists 2008
doi: 10.1242/jeb.017533
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Scaling the duration of activity relative to body mass results in similar locomotor performance and metabolic costs in lizards

E. R. Donovan* and T. T. Gleeson

Department of Integrative Physiology, University of Colorado, Boulder, CO 80309, USA


Figure 1
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  		Fig. 1. Phlyogenetic relationships among lizard species. Numbers above branches indicate branch lengths in units of total character difference using the cytochrome b gene sequence. See Materials and methods for details on phylogeny construction. An asterisk indicates species that were included as outgroups and not measured.

 

Figure 2
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  		Fig. 2. Distance traveled in (A) meters and (B) body lengths (BL) as a function of body mass. Open circles are species means, filled circles are individual values.

 

Figure 3
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  		Fig. 3. Oxygen consumption during recovery and the cost of activity (Cact) as a function of body mass. (A) Excess post-exercise oxygen consumption (EPOC); (B) factorial increase in metabolic rate expressed as the ratio of VO2,peak following activity and the resting metabolic rate (RMR); (C) Cact relative to the number of body lengths (BL) traveled; (D) Cact relative to the number of meters traveled. Open circles are species means, filled circles are individual values.

 

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  		Fig. 4. Metabolic fate of lactate. (A) Oxidation of lactate expressed as a percentage of the total amount of 14C that was injected that appeared in exhaled CO2 during the recovery period; (B) conversion of lactate to glycogen expressed as a percentage of the total amount of 14C that was injected that appeared in glycogen during the recovery period per gram of gastrocnemius muscle. Open circles are species means, filled circles are individual values.

 

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© The Company of Biologists Ltd 2008