Table 4.

Effects of body composition on metabolism in deer mice ranging in age from 27 days to 1827 days

O2max
O2sum
BMRAge < breakpointAge > breakpointAge < breakpointAge > breakpoint
Body composition(N=54)(N=25)(N=30)(N=25)(N=30)
Heart mass r=0.337, P=0.0145* r=0.642, P=0.00126* r=0.236, P=0.233 r=0.443, P=0.0387 r=0.333, P=0.0827 
Lung mass r=0.266, P=0.0565 r=0.604, P=0.00287* r=0.358, P=0.0612 r=0.420, P=0.0515 r=0.392, P=0.0394 
% fat content r=0.298, P=0.0320 r=0.601, P=0.00307* r=0.128, P=0.516 r=0.439, P=0.0408 r=0.424, P=0.0245 
Hematocrit r=0.280, P=0.0443 r=0.413, P=0.056 r=0.231, P=0.237 r=0.462, P=0.0305 r=0.347, P=0.0705 
O2max
O2sum
BMRAge < breakpointAge > breakpointAge < breakpointAge > breakpoint
Body composition(N=54)(N=25)(N=30)(N=25)(N=30)
Heart mass r=0.337, P=0.0145* r=0.642, P=0.00126* r=0.236, P=0.233 r=0.443, P=0.0387 r=0.333, P=0.0827 
Lung mass r=0.266, P=0.0565 r=0.604, P=0.00287* r=0.358, P=0.0612 r=0.420, P=0.0515 r=0.392, P=0.0394 
% fat content r=0.298, P=0.0320 r=0.601, P=0.00307* r=0.128, P=0.516 r=0.439, P=0.0408 r=0.424, P=0.0245 
Hematocrit r=0.280, P=0.0443 r=0.413, P=0.056 r=0.231, P=0.237 r=0.462, P=0.0305 r=0.347, P=0.0705 

BMR, basal metabolic rate; O2max, maximal oxygen consumption in exercise; O2sum, maximal oxygen consumption in thermogenesis.

Age breakpoints for O2max and O2sum (485 days and 483 days, respectively) were obtained from the complete data set(Table 2). Regressions were based on loge-transformed metabolic data and included the effects of loge-transformed lean tissue mass and age. Partial rand P values are shown; P values that remained significant after Bonferroni correction are indicated with asterisks (adjustedα=0.0167 for BMR and 0.0036 for O2max and O2sum).

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