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Centre for Policy on Ageing | |
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| Nocturnal sleep duration and cognitive impairment in a population-based study of older adults | | Author(s) | Adrian Loerbroks, Desiree Debling, Manfred Amelang |
| Journal title | International Journal of Geriatric Psychiatry, vol 25, no 1, January 2010 |
| Pages | pp 100-109 |
| Source | http://www.interscience.wiley.com/journal/gps doi: 10.1002/gps.2305 |
| Keywords | Cognitive impairment ; Sleep behaviour ; Time duration ; Nightly ; Correlation ; Longitudinal surveys ; Germany. |
| Annotation | The researchers aimed to investigate the association between nocturnal sleep duration, changes in nocturnal sleep duration and cognitive impairment in older adults. 4010 participants of a German population-based cohort study provided information on nocturnal sleep duration at baseline (1991-1995) and at follow-up (2002/2003). 792 follow-up participants aged 70+ by 2006 participated in telephone-based cognitive assessments. Several cognitive tests were used including the telephone interview for cognitive status (TICS). Cognitive impairment was defined as <31 points on the TICS (13.0%) and as below this percentile on the other tests. Based on individual tests, a verbal memory score and a total score were constructed. Multivariable prevalence ratios (PRs) of cognitive impairment and 95% confidence intervals (95%CIs) were computed using Poisson regression. Analyses were restricted to those free of depression in 2002/2003 (n = 695). Sleeping 6 or 8 hours per night (versus 7 hours) were unrelated to cognitive impairment. Sleeping 9 hours was positively, although imprecisely, associated with impairment of verbal memory (PR = 1.7, 95%CI = 1.0, 3.0), and less pronounced with the other cognitive measures. An increase in sleep duration from 7-8 hours in 1992-1995 to 9 hours 8.5 years later (versus sleeping 7-8 hours at both time points) was associated with an increased prevalence of cognitive impairment according to the TICS (PR = 2.1, 95% = 1.0, 4.5) and the verbal memory score (PR = 2.0, 95%CI = 1.0, 3.8). Increases in sleep duration are associated with cognitive impairment. A biological explanation for this association is currently lacking. Increases in sleep duration could be a marker of cognitive deficits. (KJ/RH). |
| Accession Number | CPA-100309210 A |
| Classmark | E4: CG: 4N: 4RD: 49: 3J: 767 |
Data © Centre for Policy on Ageing |
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| ...from the Ageinfo database published by Centre for Policy on Ageing. |
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