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Energy Expenditure

Energy expenditure is dependent on a person's sex, metabolic rate, body-mass composition, the thermic effects of food, and activity level. The approximate energy expenditure of a man lying in bed is $1.0\,kilo\,calorie\,per\,hour\,per\,kilogram$. For slow walking (just over two miles per hour), $3.0\,kilo\,calorie\,per\,hour\,per\,kilogram$. For fast steady running (about 10 miles per hour), $16.3\,kilo\,calorie\,per\,hour\,per\,kilogram$. Females expend about 10 per cent less energy than males of the same size doing a comparable activity. For people weighing the same, individuals with a high percentage of body fat usually expend less energy than lean people, because fat is not as metabolically active as muscle.

http://www.oxfordreference.com/display/10.1093/acref/9780198631477.001.0001/acref-9780198631477-e-594