Publication | Open Access
CIRCANNUAL CYCLE IN PLASMA TESTOSTERONE LEVELS IN MAN.
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1976
Year
Healthy MalePlasma Testosterone LevelsEndocrine MechanismPeak LevelsMedicinePhysiologyMenstrual CycleEndocrinologyCircadian RhythmChronobiologyReproductive HormoneCircadian BiologyReproductive Endocrinology
In a groups of 15 healthy male subjects a statistically significant circannual cycle in plasma testosterone levels was assessed by sampling blood at 3-monthly intervals. Peak levels were found in summer and early autumn and a nadir in the winter and early spring.