Table 7.

Effects of age and body composition (lean tissue and fat) onO2maxandO2sumin deer mice younger and older than the `breakpoint' age of 485 days

Young mice (<485 days)
Old mice (>485 days)
VariableFat and lean (absolute values)Fat and lean (fractions of body mass)Fat and lean (absolute values)Fat and lean (fractions of body mass)
O2max Fat r=0.509, P=0.013 r=0.237, P=0.289 r=0.481, P=0.0096 r=0.152, P=0.449 
 Lean r=0.397, P=0.060 r=0.174, P=0.439 r=0.346, P=0.0708 r=0.231, P=0.245 
 Age r=0.207, P=0.344 r=0.055, P=0.808 r=0.264, P=0.174 r=0.425, P=0.027 
O2sum Fat r=0.360, P=0.091 r=0.155, P=0.491 r=0.121, P=0.582 r=-0.225, P=0.259 
 Lean r=0.466, P=0.025 r=0.132, P=0.557 r=0.065, P=0.767 r=-0.289, P=0.143 
 Age r=0.113, P=0.608 r=0.003, P=0.989 r=-0.370, P=0.083 r=-0.399, P=0.039 
Young mice (<485 days)
Old mice (>485 days)
VariableFat and lean (absolute values)Fat and lean (fractions of body mass)Fat and lean (absolute values)Fat and lean (fractions of body mass)
O2max Fat r=0.509, P=0.013 r=0.237, P=0.289 r=0.481, P=0.0096 r=0.152, P=0.449 
 Lean r=0.397, P=0.060 r=0.174, P=0.439 r=0.346, P=0.0708 r=0.231, P=0.245 
 Age r=0.207, P=0.344 r=0.055, P=0.808 r=0.264, P=0.174 r=0.425, P=0.027 
O2sum Fat r=0.360, P=0.091 r=0.155, P=0.491 r=0.121, P=0.582 r=-0.225, P=0.259 
 Lean r=0.466, P=0.025 r=0.132, P=0.557 r=0.065, P=0.767 r=-0.289, P=0.143 
 Age r=0.113, P=0.608 r=0.003, P=0.989 r=-0.370, P=0.083 r=-0.399, P=0.039 

O2max,maximal oxygen consumption in exercise; O2sum, maximal oxygen consumption in thermogenesis.

Regressions were performed on animals younger and older than the`breakpoint' age of 485 days determined from the complete data set. 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). No P value is significant after Bonferroni correction (adjusted α=0.0023 for young and old mice).

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