Effects of age and body composition (lean tissue and fat) on BMR,V̇O2max andV̇O2sum in deer mice from 27 to 1827 days old
| . | Variable . | Fat and lean (absolute values) . | Fat and lean (fractions of body mass) . |
|---|---|---|---|
| BMR | Fat | r=0.312, P=0.0228 | r=-0.096, P=0.499 |
| Lean tissue | r=0.321, P=0.0191 | r=-0.106, P=454 | |
| Age | r=0.150, P=0.283 | r=0.038, P=0.787 | |
| V̇ O2max | Fat | r=0.401, P=0.00295* | r=0.237, P=0.091 |
| Lean tissue | r=0.505, P=0.000113* | r=0.203, P=0.149 | |
| Age | r=-0.101, P=0.470 | r=-0.227, P=0.106 | |
| V̇ O2sum | Fat | r=0.437, P=0.00107* | r=-0.014, P=0.920 |
| Lean tissue | r=0.423, P=0.00161* | r=-0.065, P=0.646 | |
| Age | r=-0.14, P=0.315 | r=-0.214, P=0.127 |
| . | Variable . | Fat and lean (absolute values) . | Fat and lean (fractions of body mass) . |
|---|---|---|---|
| BMR | Fat | r=0.312, P=0.0228 | r=-0.096, P=0.499 |
| Lean tissue | r=0.321, P=0.0191 | r=-0.106, P=454 | |
| Age | r=0.150, P=0.283 | r=0.038, P=0.787 | |
| V̇ O2max | Fat | r=0.401, P=0.00295* | r=0.237, P=0.091 |
| Lean tissue | r=0.505, P=0.000113* | r=0.203, P=0.149 | |
| Age | r=-0.101, P=0.470 | r=-0.227, P=0.106 | |
| V̇ O2sum | Fat | r=0.437, P=0.00107* | r=-0.014, P=0.920 |
| Lean tissue | r=0.423, P=0.00161* | r=-0.065, P=0.646 | |
| Age | r=-0.14, P=0.315 | r=-0.214, P=0.127 |
BMR, basal metabolic rate; V̇O2max, maximal oxygen consumption in exercise; V̇O2sum, maximal oxygen consumption in thermogenesis.
Regressions were performed across all ages. Regression coefficients(r) and P values for fat and lean tissue content were computed from absolute tissue mass and as fractions of whole body mass; in the latter case, regressions also included whole body mass (r and P values not shown). P values significant after Bonferroni correction are indicated with an asterisk (adjusted α=0.0038 for all ages combined).