Abstract
The urinary excretion of a number of individually estimated C19 and C21 steroids was measured in 26 healthy young men. The relation between the levels of excretion of certain steroids and the widths of bone, muscle and fat in the upper arm, calf and thigh measured in radiographs was studied. There was a positive relation between the excretion of androsterone and aetiocholanolone and muscle width, and also between total cortisol metabolites and bone width. There was a highly significant negative regression of total corticosterone metabolites on muscle width.

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