PMID: 11320105Apr 26, 2001Paper

Effects of transdermal testosterone on bone and muscle in older men with low bioavailable testosterone levels

The Journals of Gerontology. Series A, Biological Sciences and Medical Sciences
A M KennyL G Raisz

Abstract

A large proportion of men over 65 years of age have bioavailable testosterone levels below the reference range of young adult men. The impact of this on musculoskeletal health and the potential for improvement in function in this group with testosterone supplementation require investigation. Sixty-seven men (mean age 76 +/- 4 years, range 65--87) with bioavailable testosterone levels below 4.44 nmol/l (lower limit for adult normal range) were randomized to receive transdermal testosterone (two 2.5-mg patches per day) or placebo patches for 1 year. All men received 500 mg supplemental calcium and 400 IU vitamin D. Outcome measures included sex hormones (testosterone, bioavailable testosterone, sex-hormone binding globulin [SHBG], estradiol, and estrone), bone mineral density (BMD; femoral neck, Ward's triangle, trochanter, lumbar spine, and total body), bone turnover markers, lower extremity muscle strength, percent body fat, lean body mass, hemoglobin, hematocrit, prostate symptoms, and prostate specific antigen (PSA) levels. Twenty-three men (34%) withdrew from the study; 44 men completed the trial. In these men, bioavailable testosterone levels increased from 3.2 +/- 1.2 nmol/l (SD) to 5.6 +/- 3.5 nmol/l (p <.002) at 12 month...Continue Reading

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