Amsterdam Public Health Research Institute, Amsterdam, The Netherlands; Department of Epidemiology and Biostatistics, VU University Medical Centre, Amsterdam, The Netherlands.
Amsterdam Public Health Research Institute, Amsterdam, The Netherlands; Department of Epidemiology and Biostatistics, VU University Medical Centre, Amsterdam, The Netherlands; Julius Centre for Health Sciences and Primary Care, University Medical Centre Utrecht, The Netherlands.
Sleep Med. 2018 Jul;47:32-35. doi: 10.1016/j.sleep.2018.03.024. Epub 2018 Apr 12.
Social jetlag, a form of chronic circadian misalignment, has previously been associated with obesity in adults. We aimed to investigate the association between social jetlag and obesity-related characteristics in Dutch adolescents over a 1-year period.
We analysed data of 83 adolescents, who were recruited from a Dutch cohort born between the years 1990 and 1993. At the age of 16 and 17y, we determined anthropometric measurements, body composition, physical activity, hours of television use, and self-reported sleep duration. Using linear regression models, we assessed the association between social jetlag, defined as more than a 1-hour difference between the midpoint of sleep during weekdays and weekend days, and body mass index (BMI), body fat percentage, and waist circumference at baseline and after one year. We corrected the analysis for sex, sleep, physical activity, and hours of television use.
At age 16y, we observed that social jetlag was highly prevalent, with only 13% of the adolescents reporting no social jetlag (≤1 h), whereas 29% and 58% reported a social jetlag of >1-2 h and ≥2 h. In a cross-sectional analysis, we observed at age 16y a significant higher BMI in the group with no social jetlag, compared to the group with >1- to 2-hour and ≥2-hour social jetlag after adjustment for sex (-0.81 kg/m, 95% confidence interval = -3.1 to 1.4; and -2.09 kg/m, 95% confidence interval = -4.1 to -0.1). This association remained significant after correction for the other possible confounders. No significant associations were observed between social jetlag at age 16y and changes in obesity-related characteristics over one year.
Our pilot data showed that social jetlag is highly prevalent in adolescents, with social jetlag associated with a lower BMI; however, in this small group, social jetlag was not associated with changes in obesity-related characteristics over time.
社会时差是一种慢性昼夜节律失调，先前与成年人肥胖有关。我们旨在研究荷兰青少年在一年内社会时差与肥胖相关特征之间的关系。
我们分析了 83 名青少年的数据，这些青少年是从 1990 年至 1993 年期间出生的荷兰队列中招募的。在 16 岁和 17 岁时，我们确定了人体测量学测量、身体成分、体力活动、看电视时间以及自我报告的睡眠时间。我们使用线性回归模型评估了社会时差（定义为工作日和周末之间睡眠中点的差异超过 1 小时）与基线和 1 年后的体重指数（BMI）、体脂肪百分比和腰围之间的关联。我们为性别、睡眠、体力活动和看电视时间校正了分析。
在 16 岁时，我们发现社会时差非常普遍，只有 13%的青少年没有社会时差（≤1 小时），而 29%和 58%的青少年报告的社会时差分别为 1-2 小时和≥2 小时。在横断面分析中，我们发现 16 岁时，在调整性别后，无社会时差组的 BMI 明显高于 1-2 小时和≥2 小时社会时差组（-0.81kg/m，95%置信区间=-3.1 至 1.4；-2.09kg/m，95%置信区间=-4.1 至-0.1）。在调整其他可能的混杂因素后，该关联仍然显著。16 岁时的社会时差与 1 年内肥胖相关特征的变化之间没有观察到显著关联。
我们的初步数据表明，社会时差在青少年中非常普遍，社会时差与 BMI 较低有关；然而，在这个小群体中，社会时差与随时间推移肥胖相关特征的变化无关。
