Physical activity modifies the association between depression and cognitive function in older adults.

Area of Science:

• Gerontology
• Neuroscience
• Public Health

Background:

• Late adulthood is characterized by increased risk of depression and cognitive decline.
• The interplay between depression, cognitive function, and physical activity in older adults requires further investigation.
• Understanding gender-specific effects is crucial for targeted interventions.

Purpose of the Study:

• To investigate the influence of gender and physical activity on the relationship between depression and cognitive function in older adults.
• To determine if physical activity levels modify the association between depressive symptoms and cognitive performance.

Main Methods:

• Analysis of data from 2604 adults aged ≥ 60 years from the National Health and Nutrition Examination Survey (2011-2014).
• Assessment of physical activity, depressive symptoms, and cognitive function using the Animal Fluency Test (AFT) and Digital Symbol Substitution Test (DSST).
• Gender-specific multiple linear regressions were employed, with analyses stratified by physical activity levels.

Main Results:

• Women with moderate to severe depressive symptoms showed lower AFT scores compared to those with minimal symptoms; this was not observed in men.
• Lower AFT scores in women persisted only among those who were inactive.
• Both men and women with moderate to severe depressive symptoms exhibited lower DSST scores, an association that remained significant in insufficiently active individuals but not in those sufficiently active.

Conclusions:

• Moderate-to-vigorous physical activity plays a significant role in modifying the depression-cognition relationship in older adults.
• Engaging in at least 150 minutes per week of moderate-to-vigorous leisure-time physical activity may serve as a protective factor against cognitive decline in individuals experiencing depressive symptoms.
• Physical activity is a key factor in preserving cognitive function in the face of depression in later life.