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Ventilatory capacity and risk for dementia.
R T Schaub1, H Münzberg, M Borchelt
1Department of Psychiatry, Free University of Berlin, Germany. schaub@mail.uni-greifswald.de
Summary
Reduced lung function, measured by spirometry, is linked to a higher risk of dementia in older adults. This suggests poor respiratory health may independently increase dementia risk.
Area of Science:
- Gerontology
- Neurology
- Pulmonology
Background:
- Previous research linked ventilatory capacity indicators to cognitive function but not specifically dementia.
- This study investigates the association between various ventilatory capacity measures and dementia in the elderly.
Purpose of the Study:
- To examine the relationship between different spirometry-derived ventilatory capacity indicators and dementia.
- To control for significant confounding factors in this relationship.
Main Methods:
- Analysis of cross-sectional data from 437 participants (aged 70+) in the Berlin Aging Study (BASE).
- Ventilatory capacity assessed via spirometry: peak expiratory flow rate (PEF-R), forced expiratory volume in 1 second (FEV-1), and maximal expiratory flow rates (MEF50%FVC, MEF25%FVC).
- Logistic regression used to calculate odds ratios (OR) for dementia, adjusting for age, gender, education, ApoE4 status, COPD, smoking, heart failure, sensory function, grip strength, and physical activity.
Main Results:
- Significantly increased odds of dementia were observed in participants with the lowest ventilatory capacity compared to the best-functioning group.
- Odds ratios for dementia were elevated across all measured ventilatory capacity indicators: PEF-R (OR=20.4), FEV-1 (OR=7.5), MEF50%FVC (OR=4.3), and MEF25%FVC (OR=4.7).
Conclusions:
- Ventilatory capacity, assessed by spirometry, shows a cross-sectional association with dementia in a representative sample of the very elderly.
- Findings suggest that diminished respiratory function may be an independent risk factor for dementia, even after accounting for known risk factors.