Dynapenic-obesity and physical function in older adults

Area of Science:

• Gerontology
• Exercise Physiology
• Public Health

Background:

• Dynapenia (low muscle strength) and obesity are independently linked to diminished physical function in older adults.
• The combined condition of dynapenic-obesity may disproportionately affect physical capabilities.

Purpose of the Study:

• To investigate the impact of dynapenic-obesity on physical function in older adults.
• To compare physical function in individuals with dynapenic-obesity against those with obesity alone, dynapenia alone, or neither condition.

Main Methods:

• Cross-sectional analysis of 2,039 adults aged 55+ from NHANES (1999-2002).
• Assessment of body composition (dual-energy x-ray absorptiometry) and leg strength (dynamometer).
• Categorization into four groups: non-dynapenic/non-obese, obese alone, dynapenic alone, and dynapenic-obese, with physical function measured by walking speed and self-reported scores.

Main Results:

• The dynapenic-obese group exhibited slower walking speeds compared to non-dynapenic/non-obese and obese-alone groups (p
• Subjective physical function scores were lower in the dynapenic-obese group than in the non-dynapenic/non-obese and obese-alone groups (p
• Dynapenic-obesity was associated with significantly higher odds of walking disability compared to other groups.

Conclusions:

• Dynapenic-obesity is associated with poorer physical function compared to obesity alone.
• In most comparisons, dynapenic-obesity also demonstrated worse physical function than dynapenia alone.
• The findings highlight the critical impact of combined low muscle strength and obesity on mobility in older populations.