Anabolic applications of androgens for functional limitations associated with aging and chronic illness

Area of Science:

• Endocrinology
• Gerontology
• Men's Health

Background:

• Testosterone concentrations decline with age due to hypothalamic-pituitary-testicular axis dysfunction.
• Low testosterone is weakly linked to reduced muscle mass, strength, bone density, and increased fracture risk.
• Long-term risks and benefits of testosterone therapy remain unclear.

Purpose of the Study:

• To investigate the effects of testosterone replacement therapy (TRT) in men with testosterone deficiency.
• To determine if TRT improves muscle function, bone density, and reduces fall/disability risk in older men.
• To explore alternatives like selective androgen receptor modulators (SARMs) for muscle enhancement with fewer side effects.

Main Methods:

• The abstract does not specify the methods used in the study.
• It discusses associations and known effects of testosterone replacement.
• It mentions the development of selective androgen receptor modulators (SARMs).

Main Results:

• Physiologic TRT increases fat-free mass, grip strength, and muscle protein synthesis in deficient men.
• Effects of TRT on quadriceps strength, power, fatigability, and physical function in older men are unknown.
• TRT increases vertebral bone mineral density, but fracture risk reduction is unproven.

Conclusions:

• Testosterone decline with aging affects multiple physiological systems.
• Further research is needed to establish the long-term efficacy and safety of TRT in older men.
• SARMs are being developed as potential alternatives to TRT for muscle mass enhancement.