Table 3.

Stepwise Multiple Regression Models for energy expenditure and VO₂max^*

	r2/p		Intercept	Variable 1	Variable 2	Variable 3
Resting energy expenditure, kcal/d
Model #1	0.56 0.0001	Estimate Partial r2 p	341	14.3 × Fat 0.34 0.0003	16.8 × FFM 0.18 0.0002	−74 × Race 0.03 0.12
Model #2	0.66 0.0001	Estimate Partial r2 p	264	17.9 × Fat 0.48 0.0001	11.9 × FFM 0.13 0.001	2.4 × State 4 0.05 0.04
Energy expenditure in response to insulin and glucose infusion, kcal/d
Model #3	0.68 0.0001	Estimate Partial r2 p	284	12.1 × Fat 0.33 0.0001	20.4 × FFM 0.21 0.0001	−162 × Race 0.14 0.002
Model #4	0.75 0.0001	Estimate Partial r2 p	80	16.4 × Fat 0.52 0.0001	14.5 × FFM 0.14 0.0007	0.68 × State U 0.09 0.003
VO2max, ml/min
Model #5	0.62 0.0001	Estimate Partial r2 p	−498	56 × FFM 0.33 0.0001	−474 × Race 0.21 0.0001	42 × PA½, min 0.07 0.01
Model #6	0.65 0.0001	Estimate Partial r2 p	−874	94 × Mito Density 0.30 0.0003	41.6 × FFM 0.18 0.001	2.2 × State 3 0.17 0.0002

^*Energy expenditure Models #1 and #3 include 19 AAW and 22 CW, Model #2 include 18 AAW and 20 CW and Model #4 includes 18 AAW and 17 CW. VO₂max model #5 includes 22 AAW and 22 CW, while Model #6 includes 20 AAW and 19 CW; FFM = fat free mass, PA = physical activity, Mito = mitochondrial.