Daytime Napping and Metabolic Syndrome: A 4-Year Follow-Up Study of Chinese Middle-Aged and Older Adults.

The current study examined the relationship between napping duration and metabolic syndrome (MetS) among Chinese middle-aged and older adults over 4 years. We included 4,526 individuals aged ≥50 years who completed the 2011 and 2015 waves of the China Health and Retirement Longitudinal Study. General linear models were conducted to analyze the association of napping duration (none, 1 to 29 minutes, 30 to 59 minutes, 60 to 89 minutes, and ≥90 minutes) with MetS. At baseline, a higher prevalence of MetS was observed among participants with longer napping durations (60 to 89 minutes or ≥90 minutes) compared to non-nappers (odds ratio [OR] = 1.27, OR = 1.51, respectively). Among all participants, a napping duration ≥90 minutes at baseline was correlated with an increased risk of MetS 4 years later (OR = 1.58). Among participants without MetS at baseline, excessive napping (≥90 minutes) was predictive of a higher incidence of MetS 4 years later (OR = 1.46). Results revealed that excessive napping was related to an increased prevalence and incidence of MetS among Chinese middle-aged and older adults. [(3), 115-124.].