Social jetlag (SJ)—the shift in sleep timing between workdays and free days—is linked to deleterious cardiometabolic outcomes. SJ is greatest among emerging adults, who are already at high risk for overweight/obesity and experience suboptimal weight loss outcomes. Goals of this ancillary study were to assess SJ among emerging adults enrolled in a 6-month behavioral weight loss trial and examine the association between SJ and treatment outcomes. Bedtime/waketime were self-reported at baseline, and program engagement was monitored throughout the intervention. Weight, waist circumference, and body fat percentage were measured at baseline and post-treatment. Participants (N = 282) reported 1.5 hours of SJ on average, with 30.5% reaching the threshold for clinical significance. There were no significant associations between SJ and program engagement nor between SJ and change in adiposity. Life transitions and chaotic schedules are common during emerging adulthood; thus, further research is needed to capture nuanced patterns of sleep disruption.

社交时差（SJ）（工作日和休息日之间睡眠时间的变化）与有害的心脏代谢结果有关。在新兴成年人中，SJ最为严重，他们已经有超重/肥胖症的高风险，并且减肥效果欠佳。这项辅助研究的目的是评估参加6个月行为减肥试验的新兴成年人的SJ，并检查SJ与治疗结果之间的关联。上床时间/醒来时间是在基线时自我报告的，并且在整个干预过程中监测计划的参与度。在基线和治疗后测量体重，腰围和体脂百分比。参与者（N = 282）报告的平均SJ为1.5小时，达到临床意义阈值的比例为30.5％。SJ与计划参与度之间以及SJ与肥胖变化之间均无显着关联。在成年期，生活的转变和日程的混乱是很普遍的。因此，需要进一步的研究来捕捉睡眠破坏的细微差别。