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. 1976 May;42(5):979-82.
doi: 10.1210/jcem-42-5-979.

Circannual cycle in plasma testosterone levels in man

A G Smals, P W Kloppenborg, T J Benraad

Circannual cycle in plasma testosterone levels in man

A G Smals et al. J Clin Endocrinol Metab. 1976 May.

Abstract

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.

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