Our objective was to evaluate the association between habitual daytime napping and the prevalence of metabolic syndrome.
Materials and Methods
We conducted a population-based study of 8,547 subjects aged 40 years or older. Metabolic syndrome was defined according to a harmonized definition from a joint statement and the recommended thresholds for the Chinese population. Information about sleep duration was self-reported.
The prevalence of metabolic syndrome in the no daytime napping group, the 0 to 1 hour daytime napping group and the more than 1 hour daytime napping group were 35.0%, 36.0% and 44.5% among the females (P < 0.0001). Increased daytime napping hours were positively associated with parameters of metabolic syndrome in the female subjects, including waist circumference, systolic blood pressure, triglycerides and fasting plasma glucose (P < 0.05 for all). Multivariate adjusted logistic regression analysis revealed that, compared to the no habitual daytime napping females, napping for more than 1 hour was independently associated with an increased prevalence of metabolic syndrome (odds ratio 1.39, 95% confidence interval, 1.13–1.72). Compared to the female subjects in the no daytime napping group, those habitually napped for more than 1 hour exhibited 46% and 26% increases in the prevalence of central obesity and hypertriglyceridemia (all P < 0.05). No statistically significant associations were detected between daytime napping hours and metabolic syndrome among the male subjects.
Daytime napping is associated with an increased prevalence of metabolic syndrome in middle-aged non-obese Chinese women.
Abbreviations:MET-h/week (metabolic equivalent hours per week), BMI (body-mass index), WC (waist circumference), FPG (fasting plasma glucose), HbA1c (Hemoglobin), TG (triglycerides), TC (total cholesterol), HDL-C (high-density lipoprotein cholesterol), LDL-C (low-density lipoprotein cholesterol), HOMA-IR (homeostasis model assessment of insulin resistance), SBP (systolic blood pressure), DBP (diastolic blood pressure), SD (standard deviation), ORs (odds ratios), CI (confidence intervals)
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Published online: August 15, 2014
Accepted: August 8, 2014
Received: March 15, 2014
☆Statement of authorship: All authors believe that this manuscript represents valid work and have reviewed and approved the final version. The work has not been published previously and is not under consideration for publication elsewhere in part or in whole.
© 2014 Published by Elsevier Inc.