Pulmonary function and trajectories of cognitive decline in aging population

Area of Science:

• Gerontology
• Neuroscience
• Pulmonology

Background:

• Cognitive impairment is a growing global health concern in aging populations.
• The relationship between lung function and cognitive decline requires further investigation in large longitudinal studies.
• This study investigates the link between pulmonary function and cognitive trajectories in older adults.

Purpose of the Study:

• To examine the longitudinal associations between pulmonary function and cognitive decline.
• To assess the impact of peak expiratory flow (PEF) on cognitive performance across multiple domains.
• To determine if lung function predicts the rate of cognitive decline in older individuals.

Main Methods:

• Utilized prospective population-based SHARE data from 14 countries.
• Included 32,049 older adults with repeated cognitive assessments across six waves.
• Analyzed cognitive performance (verbal fluency, memory, numeracy) in relation to peak expiratory flow (PEF) using a multilevel accelerated longitudinal design.

Main Results:

• Lower peak expiratory flow (PEF) was significantly associated with lower cognitive performance in all measured domains (verbal fluency, memory, numeracy) and global cognitive scores.
• These associations remained significant after adjusting for multiple covariates.
• Peak expiratory flow (PEF) was not found to be associated with the rate of cognitive decline over time.

Conclusions:

• Peak expiratory flow (PEF) is independently associated with lower levels of cognitive function in older adults.
• Lung function, as measured by PEF, does not predict future cognitive decline.
• Findings suggest pre-existing differences in lung function contribute to cognitive variability, remaining stable throughout aging.