Endogenous testosterone levels, physical performance, and fall risk in older men

Area of Science:

• Gerontology
• Endocrinology
• Men's Health

Background:

• Gonadal steroid levels naturally decline with aging in men.
• The impact of diminished testosterone on age-related conditions like physical decline and falls remains uncertain.

Purpose of the Study:

• To investigate the association between low testosterone levels and physical performance.
• To determine the relationship between low testosterone and fall risk in older men.

Main Methods:

• A longitudinal, observational study followed 2587 community-dwelling men aged 65-99 years for 4 years.
• Bioavailable testosterone and estradiol levels, physical performance, and incident falls were assessed.
• Generalized estimating equations analyzed the relationship between sex steroids and fall risk.

Main Results:

• Lower bioavailable testosterone levels correlated with increased fall risk, particularly in men aged 65-69.
• Men in the lowest testosterone quartile exhibited a 40% higher fall risk compared to those in the highest quartile.
• Reduced physical performance was linked to lower testosterone, but the association with fall risk persisted independently.

Conclusions:

• Falls are prevalent in older men, with lower testosterone levels significantly increasing fall risk.
• The heightened fall risk associated with low testosterone is independent of physical performance deficits.
• These findings suggest that testosterone's influence on fall risk may involve androgen actions beyond physical performance.