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1 Division of Geriatric Medicine and Meyers Primary Care Institute, University of Massachusetts Medical School, Worcester.
2 Intramural Research Program, Laboratory of Epidemiology, Demography and Biometry, National Institute on Aging, Bethesda, Maryland.
3 Icelandic Heart Association, Kopavogur, Iceland.
4 Department of Radiology, Leiden University Medical Center, Leiden, the Netherlands.
Address correspondence to Jane S. Saczynski, PhD, Division of Geriatric Medicine, University of Massachusetts Medical School, Biotech Four, Suite 315, 377 Plantation Street, Worcester, MA 01605. E-mail: jane.saczynski{at}umassmed.edu
Background. Among persons with white matter lesions (WMLs), there is a range of cognitive function. We examine whether participation in leisure activities modifies the effect of WML load on cognitive function.
Methods. Data are from 2300 men and women (aged 66–92 years) participating in the population-based Age Gene/Environment Susceptibility-Reykjavik Study. Subcortical WML load was calculated as a weighted sum, based on size of lesions in the four lobes. Periventricular WML load was calculated as the sum of lesion scores, based on size, for the frontal caps, occipitoparietal caps and bands. The upper quartile of lesion load in either area was compared to the lower three quartiles. Composite scores of memory (MEM), speed of processing (SP), and executive function (EF) were constructed from a battery of neuropsychological tests. Frequency of participation in nine cognitively stimulating leisure activities was assessed via questionnaire; the upper quartile was compared to the lower three quartiles. Multiple regression, controlling for demographic and health factors and brain infarcts, was used to test the main effects and interaction of WMLs and leisure activity on cognitive function.
Results. High leisure activity was associated with higher performance in all three cognitive abilities: MEM β = 0.20, 95% confidence interval [CI], 0.11–0.29; SP β = 0.37, 95% CI, 0.29–0.45; and EF β = 0.23, 95% CI, 0.15–0.29. High WML load was associated with significantly lower performance in SP (β = –0.06, 95% CI, –0.13 to –0.01). The effect of WMLs on SP performance was modified by high leisure activity (p for interaction <.05).
Conclusion. Participation in cognitively stimulating leisure activity may attenuate the effect of WML pathology on cognitive performance.
Key Words: Epidemiology • Cognition • White matter lesions • Leisure activity
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