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Age and aerobic performance in deer mice

Mark A. Chappell*, Enrico L. Rezende and Kimberly A. Hammond

Department of Biology, University of California, Riverside, CA 92521, USA



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  		Fig. 1. Frequency distribution of sample sizes used at different ages for body composition studies (A; N=58) and aerobic physiology and ventilation measurements (B; N=211).

 


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  		Fig. 2. Age-related changes in mass and aerobic metabolism in 211 deer mice. Different symbols are used for males and females for variables with significant gender differences. BMR, basal metabolic rate; O2max, maximal oxygen consumption in exercise; O2sum, maximal oxygen consumption in thermogenesis.

 


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  		Fig. 3. Age-related changes in ventilation and oxygen extraction in 211 deer mice. Different symbols are used for males and females for variables showing significant gender differences. min, minute volume; VT, tidal volume; f, breathing frequency; EO2, oxygen extraction.

 


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  		Fig. 4. Simplified representation of mean age-related changes in body mass (top), whole-animal maximal oxygen consumption (middle) and mass-specific maximal oxygen consumption (bottom) in male (broken lines) and female (solid lines) deer mice. For maximal oxygen consumption, heavy lines indicate O2max (exercise) and thin lines indicate O2sum (cold exposure). Lines are derived from `breakpoint' (piecewise) regressions based on data in Fig. 2.

 


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  		Fig. 5. The relationship between maximal oxygen consumption in thermogenesis (O2sum) and maximal oxygen consumption in exercise (O2max) in 211 deer mice. Data are normalized to O2max (i.e. a value of 1.0 indicates that O2max=O2sum). The ratio of these two aerobic indices did not vary significantly with either sex or age.

 

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© The Company of Biologists Ltd 2003