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Menopause, a natural biological process marking the end of a woman's fertility, typically occurs between the fifth and sixth decade of life. This phase is characterized by the exhaustion of the ovarian follicle pool, leading to less responsive ovaries despite the high levels of Follicle Stimulating Hormone (FSH) and Luteinizing Hormone (LH). The consequential decrease in estrogen production results in symptoms like hot flashes, heavy sweating, headaches, hair loss, muscle pains, vaginal...
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Aging and androgens: Physiology and clinical implications.

Bradley D Anawalt1, Alvin M Matsumoto2,3

  • 1Department of Medicine, University of Washington School of Medicine, Department of Medicine, 1959 NE Pacific Avenue, Box 356420, Seattle, WA, 98195, USA. banawalt@medicine.washington.edu.

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PubMed
Summary

Aging men often experience declining testosterone due to changes in the hypothalamus-pituitary-testicular axis. Secondary hypogonadism may improve with lifestyle changes, while primary hypogonadism often requires testosterone replacement therapy.

Keywords:
AgingDihydrotestosteroneEstradiolHypogonadismLate-onset hypogonadismTestosterone

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Area of Science:

  • Endocrinology
  • Aging Research
  • Men's Health

Background:

  • Aging in men over 35 is linked to disruptions in the hypothalamus-pituitary-testicular axis, leading to decreased serum testosterone.
  • Key changes include reduced gonadotropin-releasing hormone (GnRH) outflow and diminished Leydig cell responsiveness to luteinizing hormone (LH).

Purpose of the Study:

  • To differentiate and describe the mechanisms and management of secondary and primary hypogonadism in aging men.
  • To guide the evaluation and treatment of low testosterone concentrations in older men.

Main Methods:

  • Review of physiological changes in the male endocrine system with aging.
  • Analysis of factors contributing to secondary hypogonadism (obesity, medications, systemic disease).
  • Distinguishing biochemical markers for secondary (low testosterone, normal LH) and primary (low testosterone, high LH) hypogonadism.

Main Results:

  • Biochemical secondary hypogonadism in older men may resolve with weight loss and addressing contributing factors.
  • Biochemical primary hypogonadism, prevalent from age 65-70 due to Leydig cell dysfunction, is generally irreversible.
  • Lower testosterone replacement therapy dosages may be safer and more effective in older men due to decreased metabolism and increased tissue sensitivity.

Conclusions:

  • Evaluation of low testosterone in older men requires assessing symptoms, signs, and causes.
  • Weight reduction can reverse secondary hypogonadism in obese older men without pituitary pathology.
  • Testosterone replacement therapy can benefit older men with primary hypogonadism.