Dynamic links between memory and functional limitations in old age: longitudinal evidence for age-based structural
Frank J Infurna1, Denis Gerstorf, Lindsay H Ryan
1Department of Human Development and Family Studies, Pennsylvania State University, University Park, PA 16802, USA. infurna@psu.edu
Psychology and Aging
|April 13, 2011
Summary
Better memory helps slow functional decline in older adults. This longitudinal study found memory significantly impacts future physical health, but not vice versa, across different age groups.
Area of Science:
- Gerontology
- Cognitive Neuroscience
- Public Health
Background:
- Understanding the dynamic relationship between cognitive function and physical health is crucial for aging research.
- Previous studies have explored links between memory and functional limitations, but dynamic, time-ordered associations require further investigation.
Purpose of the Study:
- To examine the time-ordered (dynamic) links between memory and functional limitations in older adults.
- To determine if memory influences future functional limitations or if functional limitations influence future memory.
- To explore age-related differences and the impact of covariates on these associations.
Main Methods:
- Utilized the Bivariate Dual Change Score Model on 13-year longitudinal data from the Asset and Health Dynamics Among the Oldest Old Study (AHEAD).
- Sample included 6,990 participants aged 70-95.
- Employed spline models to assess age-group similarities and multivariate approaches to control for covariates.
Main Results:
- Better memory significantly predicted shallower increases in functional limitations over time.
- Little evidence supported the hypothesis that functional limitations predict subsequent changes in memory.
- Associations remained consistent across younger-old (70-79) and older-old (80-95) age groups.
- Covariates including gender, education, health conditions, and depressive symptoms did not explain these lead-lag effects.
Conclusions:
- Cognitive functioning, specifically memory, plays a significant role in the trajectory of functional limitations in late life.
- The findings suggest memory is a key component influencing successful aging, impacting health trajectories.
- Mechanisms linking cognitive function to age-related health changes warrant further investigation across different age strata.
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