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Published on: July 5, 2017
Hormone treatment and muscle anabolism during aging: androgens
E Lichar Dillon1, William J Durham, Randall J Urban
1Department of Internal Medicine, University of Texas Medical Branch, Galveston, TX 77555, USA.
Abstract:
Aging is associated with a gradual decline in circulating testosterone concentrations and decreased musculature in men. While testosterone administration is often considered when symptoms of hypogonadism are presented, the long-term effects of androgen use on muscle physiology are not yet fully understood. The definition of hypogonadism in men remains obscure but is generally indicated by total testosterone concentrations less than a threshold value of 300-500 ng/dL. Androgen replacement therapy is generally safe in men and women with low endogenous testosterone concentrations. The development of selective androgen receptor modulators (SARMs) may provide additional options in treatment of hypogonadism while lowering the potential of side effects often associated with long-term androgen use. Androgen administration, either alone or in combination with other treatments, can be successful in improving muscle mass by increasing protein anabolism and reducing protein catabolism in men and women. Further research is necessary to optimize the anabolic and anticatabolic properties of androgens for treatment and prevention of muscle loss in men and women.
Insights
Testosterone decline with aging can cause muscle loss. Androgen therapy and selective androgen receptor modulators (SARMs) show promise for improving muscle mass by boosting anabolism and reducing catabolism.
Area of Science:
- Endocrinology
- Muscle Physiology
- Gerontology
Background:
- Aging leads to decreased testosterone and muscle mass in men.
- Hypogonadism is generally defined by testosterone levels below 300-500 ng/dL.
- Long-term effects of androgen use on muscle physiology require further investigation.
Purpose of the Study:
- To review the effects of androgen administration on muscle physiology.
- To explore the potential of selective androgen receptor modulators (SARMs) in treating hypogonadism.
- To assess the safety and efficacy of androgen replacement therapy.
Main Methods:
- Literature review on testosterone, hypogonadism, and muscle physiology.
- Analysis of studies on androgen replacement therapy and SARMs.
- Examination of mechanisms of androgen action on protein metabolism.
Main Results:
- Androgen administration can improve muscle mass by enhancing protein anabolism and reducing catabolism.
- Androgen replacement therapy is generally safe for individuals with low testosterone.
- SARMs offer potential therapeutic options for hypogonadism with potentially fewer side effects.
Conclusions:
- Androgen therapy can be effective in combating age-related muscle loss.
- Further research is needed to optimize androgens for muscle health.
- SARMs represent a promising area for future therapeutic development.
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