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Adverse changes in sleep duration are associated with lower cognitive scores in middle-aged adults
Date:4/30/2011

rs appeared to be associated with lower scores.

The study used data for 5,431 participants (1,459 women and 3,972 men) from Phase 5 (1997-1999) and Phase 7 (2003-2004) of the Whitehall II study, which included more than 10,000 London-based office staff aged 35-55 working in 20 civil service departments in 1985. Phase 5 and Phase 7 follow-ups involved postal questionnaires and clinical examinations. Cognitive function was assessed at Phase 7 using six standard tests that measured memory, reasoning, vocabulary, phonemic fluency, semantic fluency, and global cognitive status.

Habitual sleep duration was measured at Phase 5 (baseline) and Phase 7 (follow-up) using a single question: "How many hours of sleep do you have on an average week night?" Participants were divided into four groupings based on the change in sleep duration between the two checkpoints: an increase from ≤ 5 hours or 6 hours per night; an increase from 7 or 8 hours per night; a decrease from 6, 7, or 8 hours per night; and a decrease from ≥ 9 hours per night. These groups were compared with reference groups who reported no change in sleep duration between Phase 5 and Phase 7. Overall, about 58 percent of men and 50 percent of women had no change in their self-reported nightly sleep duration during the study period.

Although participants were mostly white-collar workers, the study group covered a wide socioeconomic range with a 10-fold difference in salary across the occupational hierarchy. The researchers adjusted for the effects of education and occupational position due to their known association with cognitive performance. Socioeconomic status did not account for all the observed associations, indicating either a direct association between change in sleep and cognitive function, or an association mediated or confounded by factors other than education and occupational position.

According to the authors, adequate, good quality sleep is fundamental to
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Contact: Emilee McStay
emcstay@aasmnet.org
630-737-9700
American Academy of Sleep Medicine
Source:Eurekalert

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