Association of Nap Duration after Lunch with Prevalence of Metabolic Syndrome in a Chinese Government Employee Population

Jun He, Feiyun Ouyang, Dan Qiu, Yanying Duan, Dan Luo and Shuiyuan Xiao
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Jun He: Department of Social Medicine and Health Management, Xiangya School of Public Health, Central South University, Changsha 410078, China
Feiyun Ouyang: Department of Social Medicine and Health Management, Xiangya School of Public Health, Central South University, Changsha 410078, China
Dan Qiu: Department of Social Medicine and Health Management, Xiangya School of Public Health, Central South University, Changsha 410078, China
Yanying Duan: Department of Occupational and Environmental Health, Xiangya School of Public Health, Central South University, Changsha 410078, China
Dan Luo: Department of Social Medicine and Health Management, Xiangya School of Public Health, Central South University, Changsha 410078, China
Shuiyuan Xiao: Department of Social Medicine and Health Management, Xiangya School of Public Health, Central South University, Changsha 410078, China

IJERPH, 2020, vol. 17, issue 12, 1-13

Abstract: Metabolic syndrome is an important risk factor for cardiovascular disease, type 2 diabetes mellitus, and all-cause mortality. However, the relationship between napping and metabolic syndrome remains contradictory. The aim of this study was to evaluate the association between nap duration after lunch and prevalence of metabolic syndrome, and subgroup differences in the associations among a government employee population. A total of 5129 participants (mean age 39.4 years) were included in this study. Nap duration after lunch was self-reported, and metabolic syndrome was defined according to the Joint Interim Statement in 2009. Multivariate logistic regression models and adjusted restricted cubic spline functions were used to examine the association and dose-response relationship between nap duration after lunch and prevalence of metabolic syndrome. Of the participants, 17.3% had metabolic syndrome and 81.4% were habitual nappers. Adjusted odds ratio (OR) (95% confidence interval (CI)) of metabolic syndrome for longer nap duration (>90 min) per day was 1.77 (95% CI 1.09 to 2.89), compared with reference (~30 min). Results of stratification analyses indicated the association was found only among females (OR 3.02, 95% CI 1.38 to 6.57), participants without mood symptoms (OR 1.97, 95% CI 1.19 to 3.25), and those having longer night sleep duration (≥8 h) (OR 2.34, 95% CI 1.20 to 4.56). Longer nap duration was also associated with components of metabolic syndrome, including elevated waist circumference, elevated fasting plasma glucose, and elevated triglycerides. In conclusion, longer nap duration after lunch was associated with a higher prevalence of metabolic syndrome in females, people without mood symptoms, and people having longer night sleep duration.

Keywords: nap; metabolic syndrome; mood symptom; government employee; China (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2020
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