Short sleep duration was associated with higher odds of inadequate hydration in US and Chinese adults relative to sleeping 8 hours, a recent study found. 3 samples of adults aged 20 years were analyzed: 2007–2008 National Health and Nutrition Examination Survey (NHANES; n=4,680), 2009–2012 NHANES (n=9,559), and 2012 cross-sectional wave of the Chinese Kailuan Study (n=11,903), excluding pregnant women and adults with failing kidneys. Researchers estimated multiple linear regression models between self-reported usual night-time sleep duration and urine specific gravity (Usg) and urine osmolality (Uosm) as continuous variables and logistic regression models dichotomized as inadequate hydration (>1.020 g/ml; >831 mOsm/kg). In primary analyses, they estimated models excluding diabetes and diuretic medications for healthier sub-populations (NHANES n=11,353; Kailuan n=8,766). They found:
- In the healthier NHANES subset, 6 hours was associated with significantly higher Usg and odds of inadequate hydration compared to 8 hours.
- Regression results were mixed using Uosm, but in the same direction as Usg.
- Among Chinese adults, short sleep duration (<6 and 6 hours) was associated with Usg and higher likelihood of inadequate hydration.
- No consistent association was found with sleeping ≥9 hours.
Rosinger AY, Chang A-M, Buxton O, Li J, Wu S, Gao X. Short sleep duration is associated with inadequate hydration: Cross-cultural evidence from US and Chinese adults. [Published online ahead of print November 5, 2018]. Sleep. doi:10.1093/sleep/zsy210.
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