title: Daytime sleep duration and the development of childhood overweight: the KOALA Birth Cohort Study.
abstract: Reduced nighttime sleep is a risk factor for childhood overweight, but the association between daytime sleep and overweight is unknown. The aim of this study is to evaluate daytime sleep duration as an independent risk factor for childhood overweight. Data from the KOALA Birth Cohort Study on daytime and nighttime sleep at 2 years (N = 2322), and body mass index (BMI) around 2, 5, 6, 7, 8 and 9 years were used. Multivariable general estimating equation regression analyses were performed to examine the associations of sleep duration with BMI (linear) and overweight (logistic). No associations between daytime sleep and BMI or overweight were found, whereas longer nighttime sleep was associated with lower BMI and lower risk of overweight persisting up to age 9. Daytime sleep duration is probably less relevant for prevention of childhood overweight.
authors.affiliation: Department of Health Promotion, NUTRIM School for Nutrition, Toxicology and Metabolism, Maastricht University, Maastricht, The Netherlands.
authors.forename: R
authors.initials: R
authors.lastname: Bolijn
authors.affiliation: Department of Health Promotion, NUTRIM School for Nutrition, Toxicology and Metabolism, Maastricht University, Maastricht, The Netherlands. jessica.gubbels@maastrichtuniversity.nl.
authors.forename: J S
authors.initials: JS
authors.lastname: Gubbels
authors.affiliation: Department of Health Promotion, NUTRIM School for Nutrition, Toxicology and Metabolism, Maastricht University, Maastricht, The Netherlands.
authors.forename: E F C
authors.initials: EF
authors.lastname: Sleddens
authors.affiliation: Department of Health Promotion, NUTRIM School for Nutrition, Toxicology and Metabolism, Maastricht University, Maastricht, The Netherlands.
authors.forename: S P J
authors.initials: SP
authors.lastname: Kremers
authors.affiliation: Department of Epidemiology, CAPHRI School for Public Health and Primary Care, Maastricht University, Maastricht, The Netherlands.
authors.forename: C
authors.initials: C
authors.lastname: Thijs
mesh_terms: D015992:Body Mass Index; D002648:Child; D002675:Child, Preschool; D015331:Cohort Studies; D005260:Female; D006801:Humans; D008297:Male; D050177:Overweight / Q000209:etiology*; D012044:Regression Analysis; D012307:Risk Factors; D012890:Sleep; D013997:Time Factors
keywords: Children; napping; overweight; sleep duration