Most common determinant of energy expenditure in a resting state is:
Lean Body Mass
Adipose tissue
Resting Hea Rate
Exercise
Energy expended in the resting state depends primarily on the lean body mass and the metabolic cost for processing ingested nutrients. Ref: New Developments in Obesity Research By Lawrence F. Ditmier, Page 131; Handbook of Obesity: Etiology and Pathophysiology By George A. Bray, Page 705