Table 2.

Major organ/tissue masses and whole-body resting energy expenditure

	Men	Women	P
Liver (kg)	1.54 ± 0.26	1.27 ± 0.18	<0.001
Brain (kg)	1.40 ± 0.08	1.26 ± 0.09	<0.001
Heart (kg)	0.37 ± 0.07	0.26 ± 0.06	<0.001
Kidneys (kg)	0.32 ± 0.05	0.26 ± 0.05	<0.001
Skeletal muscle (kg)	32.4 ± 3.7	21.5 ± 3.2	<0.001
Adipose tissue (kg)	17.1 ± 6.2	21.4 ± 5.7	<0.001
Residual mass (kg)	28.5 ± 4.3	20.7 ± 3.0	<0.001
REEm (kcal/day)	1780 ± 188	1407 ± 137	<0.001
REEp (kcal/day)	1789 ± 157	1409 ± 137	<0.001
REEm – REEp (kcal/day)	−9 ± 91	−2 ± 74	0.66
REE/BM (kcal/kg per day)	21.9 ± 1.7	21.3 ± 2.1	0.10

All values are mean ± SD. P value, t test for significant difference between the men and women. There were no significant differences between REEm and REEp (paired Student’s t test, P = 0.49 for the men and P = 0.86 for the women).

Abbreviations: REE/BM, mass-specific basal metabolic rate; REEm, resting energy expenditure measured by indirect calorimetry; REEp, resting energy expenditure predicted by equation 3.