Table 3.

Parameters of whole-body energy expenditure, assessed by indirect calorimetry and the cross-sectional areas of muscles contributing to the MR signal in endurance trained (n = 7) and sedentary subjects (n = 8)

	Sedentary	Trained
Energy expenditure, kcal/kg/24 hr	23.7 ± 0.8	24.2 ± 1.2
Respiratory quotient†	0.78 ± 0.02	0.77 ± 0.02
Fat oxidation†, mg/kg per min	4.88 ± 0.79	4.89 ± 0.72
Glucose Oxidation†, mg/kg per min	0.46 ± 0.20	0.47 ± 0.12
Total muscle CSA, cm2	16.7 ± 0.6	19.6 ± 0.5*
CSA soleus, cm2	9.0 ± 1.0	6.7 ± 1.0
CSA gastrocnemius, cm2	7.7 ± 1.1	12.9 ± 0.9*

CSA, cross sectional area.

*P < 0.005.

^†n = 7.