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Journal of Clinical Endocrinology & Metabolism Vol. 42, No. 5 979-982
doi:10.1210/jcem-42-5-979
Copyright © 1976 by the Endocrine Society.
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CIRCANNUAL CYCLE IN PLASMA TESTOSTERONE LEVELS IN MAN.

A.G.H. Smals, P.W.C. Kloppenborg and Th.J. Benraad

Department of Internal Medicine, Division of Endocrinology, University of Nijmegen Nijmegen, The Netherlands

In a group 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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