Demographic, physical and lifestyle factors associated with androgen status: The Florey Adelaide Male Ageing Study (FAMAS)

Evan Atlantis, Sean A. Martin, Matthew T. Haren, Peter D. O'Loughlin, Anne W. Taylor, Ravinder Anand-Ivell, Richard Ivell, Gary A. Wittert

Research output: Contribution to journalArticle

34 Citations (Scopus)

Abstract

Objective Plasma androgen levels are inversely associated with health in men, the age-related decline of which may result from factors other than ageing per se. This study aimed to determine the effects of demographic, physical and lifestyle factors on age-related androgen status in men. Design An observational survey of a regionally representative male population residing in the North West regions of Adelaide, Australia. Participants Study sample includes 1195 men aged 35-81 years with a response rate of 45·1%. Measurements Plasma levels of total testosterone (TT), bioavailable testosterone (BT), SHBG, insulin-like peptide 3 (INSL3), and gonadotrophins were measured along with an extensive list of demographic, physical and lifestyle factors including body composition, muscle strength and biomarkers of chronic diseases, physical activity, nutrition and smoking behaviour. Results Low TT was mostly associated with high abdominal fat and triglycerides and low muscle strength rather than ageing per se. Low BT was associated with increased age followed by high whole body fat percentage. BT and TT levels were higher in unmarried men and smokers. SHBG levels increased with age, but were also inversely associated with insulin and triglycerides. The Leydig cell specific factor INSL3 was the strongest biomarker associated with both TT and BT. Conclusions Factors associated with low androgen status variably include high body fat percentage, low muscle strength and biomarkers of the metabolic syndrome. Reducing exposure to factors that adversely affect androgen status may improve the general health of ageing men by mechanisms yet to be defined.

LanguageEnglish
Pages261-272
Number of pages12
JournalClinical Endocrinology
Volume71
Issue number2
DOIs
Publication statusPublished - 1 Aug 2009

ASJC Scopus subject areas

  • Endocrinology, Diabetes and Metabolism
  • Endocrinology

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