Vol 25, No 2 (2018)
Original articles — Clinical cardiology
Published online: 2017-07-17

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Longitudinal relationships between cardiovascular events, risk factors, and time-dependent sleep duration

Daiki Kobayashi, Nagato Kuriyama, Yasuhiro Osugi, Hiroko Arioka, Osamu Takahashi
Pubmed: 28714521
Cardiol J 2018;25(2):229-235.


 Background: Although many studies have evaluated the relationships between sleep duration and cardiovascular (CV) events/risk factors, longitudinal associations with time-dependent sleep duration have not been adequately assessed.

Methods: A retrospective, longitudinal study was conducted involving individuals aged 20 years or older that received annual health check-ups at St. Luke’s International Hospital from 2005 to 2010. Data collection included self-reported demographic, clinical and health habit information (including sleep duration; < 6, 6–7, 7–8, ≥ 8 h), baseline examinations, and laboratory measures for each year. We conducted mixed effects analyses to examine the associations between non-fatal CV events, risk factors, and time-dependent sleep duration longitudinally.

Results: Of the total of 31,830 participants enrolled, 70.1% of participants changed their sleep dura­tion, and 365 participants experienced CV events during follow-up periods. Compared to those reporting 7–8 h of sleep, those reporting less than 6 h of sleep were significantly more likely to experience non-fatal CV events (odds ratio [OR] 1.78; 95% confidence interval [CI] 1.03–3.07; p = 0.04), but other groups were not (OR 1.12; 95% CI 0.70–1.77; p = 0.64 for 6–7 h and OR 1.22; 95% CI 0.68–2.23; p = 0.50 for ≥ 8 h). The shortest sleep duration was associated with a higher likelihood of obesity/overweight status (OR 1.49; 95% CI 1.32–1.69; p < 0.01).

Conclusions: Individuals reporting less than 6 h of sleep were significantly more likely to have non-fatal CV events than those reporting 7–8 h of sleep. For the risk factors, short sleep duration was associ­ated with obesity/overweight status.

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