Key result
Longer objective sleep duration, measured via 24-hour Holter monitoring, is significantly associated with lower grip strength, poorer self-rated health, poorer immediate recall, and higher mortality risk.
Why the study?
Does objective sleep duration correlate with health outcomes in elderly Russians?
Cohort (n=201)
No
Does objective sleep duration correlate with health outcomes in elderly Russians?
Objective sleep duration measured by Holter monitoring is a better predictor of poor health outcomes than self-reported sleep in elderly individuals.
Longer objective sleep may flag poorer health in elderly; hypothesis-generating and should not yet change practice or risk models.
Objectives -We examine the relationship between sleep duration and health in the high mortality context of Russia. Methods -Night and daytime sleep durations are based on self-reports and 24-hour heart rate trends (Holter monitoring). The sample of 201 individuals (Holter data for 185) is drawn from the Moscow Lipid Research Clinics cohort, followed up since 1975-77. Field-work occurred in 2002-03. Results -Although objective and reported mean sleep are similar, there are significant intraindividual differences. Significant associations are found between objective sleep and health: longer sleep corresponds to lower grip strength, poorer self-rated health and immediate recall, and higher mortality risk score. No significant relationships are found for subjective sleep. Conclusions -We provide the first evidence of an association between long sleep and worse health outcomes among elderly Russians. Predictive power increases if objective sleep measures are used, a consideration which is especially important in small studies.
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Shkolnikova et al. (2006) conducted a cohort in Elderly adults (n=201). Longer objective sleep duration vs. Shorter objective sleep duration was evaluated on Health outcomes including grip strength, self-rated health, immediate recall, and mortality risk score. Longer objective sleep duration, measured via 24-hour Holter monitoring, is significantly associated with lower grip strength, poorer self-rated health, poorer immediate recall, and higher mortality risk.
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