Obesity and Falls in a Prospective Study of Older Men: The Osteoporotic Fractures in Men Study

Area of Science:

• Gerontology
• Biomedical Engineering
• Epidemiology

Background:

• Falls are a major health concern for older adults, leading to fractures and reduced mobility.
• Body Mass Index (BMI) and age are known risk factors for falls, but their interplay requires further investigation.
• Physical performance, including gait stability, may mediate the relationship between BMI and fall risk.

Purpose of the Study:

• To investigate the association between Body Mass Index (BMI) categories and fall rates in older men.
• To examine how age modifies the relationship between BMI and fall incidence.
• To explore the role of physical performance and comorbidities in the BMI-falls relationship.

Main Methods:

• Utilized data from the Osteoporotic Fractures in Men (MrOS) study, including 5,834 men aged 65 and older.
• Collected fall data every 4 months over an average of 4.8 years.
• Employed mixed-effects models to analyze adjusted associations between BMI and incident falls, considering age and physical performance metrics.

Main Results:

• Overall fall rate was 0.66/man-year, with the lowest rates in younger, normal-weight men (0.44/man-year) and highest in older, high-BMI men (1.47/man-year).
• Obesity was linked to a 24%-92% increased fall risk in men under 80 (p-trend ≤ .0001).
• The association between BMI and falls was substantially altered only after adjusting for dynamic balance tests (narrow walk time).

Conclusions:

• Obesity is an independent risk factor for increased fall rates in men aged 65 to 80.
• Gait stability, as indicated by narrow walk time, may play a mediating role in the association between obesity and falls in older men.
• These findings highlight the importance of assessing physical performance in fall prevention strategies for older adults, particularly those with higher BMI.