European Journal of Endocrinology · 1982 · 29 citations · 0 references
MedicineEndocrinologyPhysiologyReproductive EndocrinologyReproductive PhysiologySteroid BiochemistryAndrogen PhysiologyCircadian EndocrinologyGonadal HormonesGonadal Steroid HormonesMale Reproductive EndocrinologyTesticular PhysiologyAge-related Sex Steroid ChangesAging Male EndocrinologyDiurnal Hormone VariationGonadal Axis AgingMale Reproductive AgingMedian AgeSex Steroid MeasurementTesticular Circadian Rhythms
Basal circulating levels of progesterone, 17 alpha-OH-progesterone, dehydroepiandrosterone, androstenedione, testosterone and oestradiol-17 beta were measured in 'young' (median age 34 years) and 'old' (median age 73 years) normal males between 08.30 and 17.00 h. Diurnal rhythms for 17 alpha-OH-progesterone, dehydroepiandrosterone, androstenedione and testosterone were observed in both young and old men. No rhythms were discernible for progesterone or oestradiol-17 beta in both age groups.