Does Mild Functional Impairment Predict Dementia in Older Adults With Normal Cognition?

Area of Science:

• Gerontology
• Neuroscience
• Cognitive Aging

Background:

• Functional impairment can signal cognitive decline.
• Its predictive role in cognitively normal (CN) older adults is not well understood.
• Early identification of dementia risk is crucial for timely intervention.

Purpose of the Study:

• To investigate if mild functional impairment (MFI) in CN older adults predicts incident dementia over six years.
• To assess the association between MFI and cognitive performance.
• To explore definitions of MFI for improved dementia prediction.

Main Methods:

• A 6-year longitudinal study of 296 community-dwelling CN older adults.
• Mild functional impairment (MFI) assessed via objective performance and/or subjective questionnaires.
• Cox and linear regression analyses used to evaluate MFI's relationship with dementia risk and cognitive changes.

Main Results:

• No significant longitudinal link found between MFI and incident dementia or cognitive decline over six years.
• Defining MFI using both performance-based and informant-reported measures predicted dementia.
• MFI correlated with poorer baseline global cognition, attention, visuospatial ability, and executive functioning.

Conclusions:

• Mild functional impairment alone does not increase dementia risk in CN older adults over six years.
• A combined performance-based and informant-based definition of MFI may enhance dementia prediction.
• Further research is needed to refine functional assessment tools for early dementia detection.