Short and long sleep duration are linked to reduced kidney function, but little research has examined how sleep is associated with hydration status. Our aim was to assess the relationship between sleep duration and urinary hydration biomarkers among adults in a cross-cultural context.
Three samples of adults aged 20y 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. We estimated multiple linear regression models between self-reported usual night-time sleep duration (<6, 6, 7, 8 (reference), 9 hrs/day) 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, we estimated models excluding diabetes and diuretic medications for healthier sub-populations (NHANES n=11,353; Kailuan n=8,766).
In the healthier NHANES subset, 6 hours was associated with significantly higher Usg and odds of inadequate hydration (adjusted OR: 1.59, 95% CI: 1.25, 2.03) 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 (6 hours adjusted OR: 1.42, 95% CI: 1.26, 1.60). No consistent association was found with sleeping ≥9 hours.
Short sleep duration was associated with higher odds of inadequate hydration in US and Chinese adults relative to sleeping 8 hours. SOURCE
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