Journal
JOURNAL OF SLEEP RESEARCH
Volume 18, Issue 1, Pages 129-135Publisher
WILEY
DOI: 10.1111/j.1365-2869.2008.00704.x
Keywords
actigraphy; aging; circadian rhythm; cognitive function; sleep
Categories
Funding
- Netherlands Organization of Scientific Research (NWO)
- Hague [016.025.041]
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Aging affects both cognitive performance and the sleep-wake rhythm. The recent surge of studies that support a role of sleep for cognitive performance in healthy young adults suggests that disturbed sleep-wake rhythms may contribute to 'age-related' cognitive decline. This relationship has however not previously been extensively investigated. The present correlational study integrated a battery of standardized cognitive tests to investigate the association of mental speed, memory, and executive function with actigraphically recorded sleep-wake rhythms in 144 home-dwelling elderly participants aged 69.5 +/- 8.5 (mean +/- SD). Multiple regression analyses showed that the partial correlations of the fragmentation of the sleep-wake rhythm with each of the three cognitive domains (r = -0.16, -0.19, and -0.16 respectively) were significant. These associations were independent from main effects of age, implying that a unique relationship between the rest-activity rhythm and cognitive performance is present in elderly people.
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