1. Mechanical Muscle Function and Lean Body Mass During Supervised Strength Training and Testosterone Therapy in Aging Men with Low-Normal Testosterone Levels.
- Author
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Kvorning, Thue, Christensen, Louise L., Madsen, Klavs, Nielsen, Jakob L., Gejl, Kasper D., Brixen, Kim, and Andersen, Marianne
- Subjects
MUSCLE contraction ,X-ray densitometry in medicine ,HORMONE therapy ,EXERCISE tests ,AGING ,ANALYSIS of variance ,EXERCISE ,MUSCLE strength ,PLACEBOS ,TESTOSTERONE ,RANDOMIZED controlled trials ,BLIND experiment ,LEAN body mass ,DESCRIPTIVE statistics - Abstract
Objectives To examine the effect of strength training and testosterone therapy on mechanical muscle function and lean body mass ( LBM) in aging men with low-normal testosterone levels in a randomized, double-blind, placebo-controlled 24-week study. Design Randomized, double-blind, placebo-controlled. Setting Odense, Denmark. Participants Men aged 60 to 78, with bioavailable testosterone levels of less than 7.3 nmol/L and a waist circumference greater than 94 cm were randomized to testosterone (50-100 mg/d, n = 22) placebo (n = 23) or strength training (n = 23) for 24 weeks. The strength training group was randomized to addition of testosterone or placebo after 12 weeks. Subjects performed supervised strength training (2-3 sets with 6- to 10-repetition maximum loads, 3 times per week). Measurements Testosterone levels, maximal voluntary contraction and rate of force development, and LBM were obtained at 0 and at Weeks 12 and 24 of the intervention. Results No changes in any variables were recorded with placebo. In the strength training group, maximal voluntary contraction increased 8% after 12 weeks ( P = .005). During the following 12 weeks of strength training rate of force development increased by 10% ( P = .04) and maximal voluntary contraction further increased ( P < .001). Mechanical muscle function was unchanged in men receiving only testosterone for 24 weeks. LBM increased only in men receiving testosterone ( P = .004). Conclusion Strength training in aging men with low-normal testosterone levels may improve mechanical muscle function, but this effect occurs without a significant increase in LBM. Clinically, only the combination of testosterone therapy and strength training resulted in an increase in mechanical muscle function and LBM. [ABSTRACT FROM AUTHOR]
- Published
- 2013
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