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The observation of an 8- to 10-day cyclic excretion of urinary oestrone in the normal human male (Exley & Corker, 1966) and the suggestion that this could be the result of a cyclic secretion of oestrone by the testes, stimulated a search for evidence of such a cycle in the urinary excretion of testosterone. Testosterone is excreted in the urine mainly as testosterone glucosiduronate and although the amount excreted of this urinary metabolite is not an accurate parameter of testosterone production it is considered to provide a reasonable indication of this production in the human male (Horton, Shinsako & Forsham, 1965). A longitudinal study of the daily excretion of urinary testosterone was therefore undertaken.

Two normal male subjects with sedentary occupations who abstained from unusual exertion during the period of urine collection were investigated. Subject A was 28 yr. old, 5 ft. 11 in. tall, weighed 161 lb. and was