Sleep-related intermittent hypoxemia and glucose intolerance: a community-based study
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Sakurako Tanno1, Takeshi Tanigawa2, Isao Saito3
1Department of Public Health, Ehime University Graduate School of Medicine, Toon, Japan; Center of Sleep Medicine, Ehime University Hospital, Toon, Japan.
Background:
Intermittent hypoxemia is a fundamental pathophysiological consequence of sleep-disordered breathing and may alter glucose metabolism. To characterize the association between sleep-related intermittent hypoxemia and glucose metabolism, overnight pulse-oximetry and an oral glucose tolerance test were completed in a cohort of middle-aged and older Japanese adults.
Methods:
The study sample consisted of 1836 community-dwelling Japanese (age, 30-79 years; women, 65.5%; mean body mass index, 23.1 kg/m(2)). The oxygen desaturation index (ODI) was quantified during sleep using a ≥3% oxygen desaturation threshold and categorized as normal (<5.0 events/h), mild (5.0-15.0 events/h), and moderate to severe (≥15.0 events/h). The independent associations between the ODI and the prevalence of impaired fasting glucose, impaired glucose tolerance, diabetes, and two metrics of insulin resistance [homeostasis model assessment index for insulin resistance (HOMA-IR) and Matsuda index] were examined.
Results:
Compared with subjects with an ODI < 5 events/h, the adjusted odds ratio for prevalent impaired fasting glucose, glucose intolerance, and diabetes for subjects with an ODI ≥15.0 events/h were 1.27 (95% confidence interval, 0.72-2.23), 1.69 (1.03-2.76), and 1.28 (0.59-2.79), respectively. Both HOMA-IR and Matsuda index were significantly associated with the severity of sleep-related intermittent hypoxemia as assessed by the ODI (P for trend = 0.03 and 0.007, respectively).
Conclusion:
Among middle-aged and older Japanese adults, sleep-related intermittent hypoxemia is associated with glucose intolerance and insulin resistance, and may contribute to the development of type 2 diabetes mellitus.
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