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Uptodate Reference Title
Diurnal pattern of testosterone secretion
Diurnal pattern of testosterone secretion
Hourly serum testosterone levels in normal young (n = 17) and older (n = 12) males. The circadian rhythm is lost in older males. Blood samples were obtained using an indwelling peripheral venous cannula, which allowed free movement and normal sleep.
Data from: Bremner WJ, Vitiello MV, Prinz PN. Loss of circadian rhythmicity in blood testosterone levels with aging in normal men. J Clin Endocrinol Metab 1983; 56:1278.