title: Hormone treatment and muscle anabolism during aging: androgens.
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.
authors.affiliation: Department of Internal Medicine, University of Texas Medical Branch, Galveston, TX 77555, USA.
authors.forename: E Lichar
authors.initials: EL
authors.lastname: Dillon
authors.forename: William J
authors.initials: WJ
authors.lastname: Durham
authors.forename: Randall J
authors.initials: RJ
authors.lastname: Urban
authors.forename: Melinda
authors.initials: M
authors.lastname: Sheffield-Moore
mesh_terms: D000375:Aging / Q000378:metabolism*; D000728:Androgens / Q000627:therapeutic use*; D004359:Drug Therapy, Combination; D005260:Female; D020249:Hormone Replacement Therapy; D006801:Humans; D007006:Hypogonadism / Q000188:drug therapy*; D008297:Male; D018482:Muscle, Skeletal / Q000187:drug effects / Q000378:metabolism*; D011944:Receptors, Androgen / Q000187:drug effects; D013739:Testosterone / Q000008:administration & dosage / Q000627:therapeutic use
chemical_list: D000728:Androgens; D011944:Receptors, Androgen; D013739:Testosterone
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