Stoner Lee, Castro Nicholas, Signal Leigh, Skidmore Paula, Faulkner James, Lark Sally, Williams Michelle A, Muller Diane, Harrex Harriet
1 Department of Exercise and Sport Science, University of North Carolina at Chapel Hill , Chapel Hill, NC.
2 School of Sport and Exercise, Massey University , Wellington, New Zealand .
Child Obes. 2018 Apr;14(3):158-164. doi: 10.1089/chi.2017.0272. Epub 2018 Jan 3.
While short and poor quality sleep have been associated with childhood obesity, no known studies have examined social jetlag. Social jetlag is the discrepancy between an individual's circadian clock and social rhythms, and is measured as the difference in hours between the midpoint of sleep during work/school days and on free (weekend) days. This study investigated the independent associations between sleep duration, sleep disturbances, and social jetlag with adiposity in children.
A cross-sectional study, including 341 children (50% female) aged 8-10 years. Five dependent variables: body fat (%), fat mass (kg), fat mass index (FMI, kg/m), waist to hip ratio, and body mass index (kg/m). Three independent variables: average sleep duration, sleep disturbances, and social jetlag.
Following adjustment for confounders, sleep duration was not associated with any variable, and sleep disturbances were associated with FMI (β = 0.047, 95% CI: 0.002, 0.093 kg/m), while social jetlag was associated with all five adiposity variables, including an absolute 3% greater body fat (β = 2.963, 95% CI: 0.40, 5.53%) per 1 hour of social jetlag.
Social jetlag may be an important and measurable public health target in children.
虽然短睡眠和低质量睡眠与儿童肥胖有关，但尚无已知研究考察社会时差。社会时差是指个体生物钟与社会节律之间的差异，通过工作日/上学日与休息日（周末）睡眠中点之间的小时数差异来衡量。本研究调查了儿童睡眠时间、睡眠障碍和社会时差与肥胖之间的独立关联。
一项横断面研究，纳入341名8至10岁儿童（50%为女性）。五个因变量：体脂（%）、脂肪量（kg）、脂肪量指数（FMI，kg/m）、腰臀比和体重指数（kg/m）。三个自变量：平均睡眠时间、睡眠障碍和社会时差。
在对混杂因素进行调整后，睡眠时间与任何变量均无关联，睡眠障碍与FMI相关（β = 0.047，95%置信区间：0.002，0.093 kg/m），而社会时差与所有五个肥胖变量均相关，每1小时社会时差导致体脂绝对增加3%（β = 2.963，95%置信区间：0.40，5.53%）。
社会时差可能是儿童重要且可测量的公共卫生指标。
