Lifestyle factors that affect cognitive function-a longitudinal objective analysis

Area of Science:

• Gerontology
• Neuroscience
• Public Health

Background:

• Lifestyle factors significantly impact cognitive decline and dementia risk in aging populations.
• Longitudinal associations between sleep, physical activity, and cognitive function require further elucidation.
• Objective measurement of lifestyle behaviors is crucial for understanding their impact on cognitive health.

Purpose of the Study:

• To investigate the longitudinal associations between objectively measured sleep and physical activity with cognitive function in older adults.
• To determine if sleep quality and physical activity levels predict cognitive decline over a three-year period.
• To inform the development of interventions for dementia prevention.

Main Methods:

• A prospective cohort study involving 855 community-dwelling adults aged 65 and older.
• Participants wore wearable sensors for 7 days every 3 months to objectively measure sleep and physical activity.
• Cognitive function was assessed annually using the Mini-Mental State Examination (MMSE) over three years.
• Principal component analysis and linear mixed-effects models were used to analyze the data.

Main Results:

• A higher sleep index (indicating poorer sleep quality) was inversely associated with MMSE scores (p=0.0047).
• A lower physical activity index (indicating less physical activity) was positively associated with MMSE scores (p=0.0453).
• These associations remained significant after adjusting for age, sex, and education level.

Conclusions:

• Poor sleep quality and reduced physical activity are significant risk factors for cognitive decline in older adults.
• Objective lifestyle measurements provide valuable insights into dementia risk.
• Findings support the development of targeted interventions to improve sleep and physical activity for cognitive health.