Circadian variations of plasma testosterone and estrogens in normal men. A study by frequent sampling |
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| Authors: | P Leymarie M Roger M Castanier R Scholler |
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| Affiliation: | 1. Department of Obstetrics and Gynecology, University of Missouri Kansas City, Kansas City, MO;2. Division Urogynecology and Reconstructive Pelvic Surgery, Magee-Womens Research Institute, University of Pittsburgh School of Medicine, Pittsburgh, PA;3. RTI International, Research Triangle Park, NC;4. Duke University, Durham, NC;5. Divison of Urogyneology, Alpert Medical School of Brown University, Providence, RI;6. NICHD/NIH, Rockville, MD;7. Division of Female Pelvic Medicine and Reconstructive Surgery, UT Southwestern, Dallas, TX;8. Department of Obstetrics and Gynecology, Southern California Permanente Medical Group, Downey, CA;9. Department of Obstetrics and Gynecology, Hospital of the University of Pennsylvania, Philadelphia, PA;10. Division of Urogynecology and Pelvic Reconstructive Surgery, University of Alabama at Birmingham, Birmingham, AL;1. Faculty of Technology Novi Sad, University of Novi Sad, Bulevar Cara Lazara 1, 21000 Novi Sad, Serbia;2. Institute of Food Technology, University of Novi Sad, Bulevar Cara Lazara 1, 21000 Novi Sad, Serbia;3. Faculty of Sciences, University of Novi Sad, Trg Dositeja Obradovića 3, 21000 Novi Sad, Serbia;4. Faculty of Pharmacy, Trg Mladenaca 5, 21000 Novi Sad, Serbia;1. Department of Radiology, H. Lee Moffitt Cancer Center and Research Institute, Tampa, FL;2. Comprehensive Breast Program, H. Lee Moffitt Cancer Center and Research Institute, Tampa, FL;3. Department of Anatomic Pathology, H. Lee Moffitt Cancer Center and Research Institute, Tampa, FL;3. From the Interdisciplinary Graduate Physiology Program;4. Department of Nutritional Sciences, The Pennsylvania State University, University Park, Pennsylvania 16802;5. Departments of Cellular and Molecular Physiology, Penn State Hershey College of Medicine, Hershey, Pennsylvania 17033;8. Department of Pharmacology, Penn State Hershey College of Medicine, Hershey, Pennsylvania 17033;6. Department of Surgery, Penn State Hershey College of Medicine, Hershey, Pennsylvania 17033;12. Laboratory of Immune Regulation, Faculty of Pharmaceutical Sciences, Suzuka University of Medical Science, Suzuka 513-8670, Japan;1. Department of Urology, Soonchunhyang University Hospital, College of Medicine, Soonchunhyang University, Seoul, Korea;2. Department of Biostatistics, Soonchunhyang University Hospital, College of Medicine, Soonchunhyang University, Seoul, Korea;3. Department of Surgery, Soonchunhyang University Hospital, College of Medicine, Soonchunhyang University, Seoul, Korea;1. Department of Obstetrics and Gynecology, Ludwig-Maximilians-University Munich, Maistrasse, Germany;2. Department of Forensic Medicine, Ludwig-Maximilians-University Munich, Germany |
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| Abstract: | Plasma levels of testosterone, estrone and estradiol were measured by radioimmunoassay every 30 min for 25 h in four young adult males. A coincident though unidentical circadian rhythm of plasma testosterone was demonstrated in all cases. Rapid variations which were consistent with a pulsatile pattern of testosterone secretion were seen in each subject. In one of them an identical rhythm was shown again when reinvestigated 3 months later. Plasma estradiol level was constant throughout the day, but the estrone curve exhibited a phase of lower levels during the sleep while testosterone concentration was gradually increasing. |
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