Table 2_The relationship between sleep duration and physical activity level among Norwegian adolescents: a cross-sectional study.docx

BackgroundFailure to adhere to sleep and physical activity recommendations among adolescents constitutes a public health problem. However, the associations between sleep duration and adolescents’ physical activity levels remain less explored. The aims of this paper were twofold: (1) to describe sleep and physical activity levels among Norwegian school-based adolescents, stratified by school level and sex and (2) to explore the association between sleep and physical activity levels.MethodsData were derived from the 2022 Norwegian Ungdata Survey, totaling 63,113 adolescents from lower (aged 13 to 16 years) and upper (aged 16 to 19 years) secondary schools. Study variables were measured using single-item questions from the Ungdata survey and collected through an electronic questionnaire administered during school hours. Logistic regressions were performed using crude analysis and adjusted for Socioeconomic status (SES) and grade level (age).ResultsIn lower secondary school, 57.0% of girls and 44.7% of boys reported sleeping less than the recommended 8 h, whereas in upper secondary school, the rate was 74.9% among girls and 74.3% among boys. Girls consistently reported more sleep problems, feeling more tired at school or during activities, and less physical activity than boys across school levels. Sleep duration was a significant predictor for all levels of weekly physical activity among girls across school levels, with the highest odds revealed in upper secondary school among those being active 5 times a week (B = 1.32; 95% CI [1.24 to 1.40]). Sleep duration was a predictor for being active 5 times a week for boys across school levels (B = 1.22; 95% CI [1.17 to 1.27]).ConclusionAbout half of younger adolescents and three-quarters of older adolescents do not adhere to the sleep recommendation. Lower levels of physical activity were consistently reported by girls than boys. Sleep duration consistently predicted a 20 to 30% higher likelihood of being active at least 5 days a week across sex and school levels. These findings underscore the critical role of sleep duration relations to higher physical activity levels among Norwegian adolescents. Government and policymakers should encourage healthy sleep and PA habits by explicitly incorporating guidelines into the curriculum.

背景：青少年未能遵守睡眠和身体活动建议已成为公共卫生问题。然而，睡眠时长与青少年身体活动水平之间的关联研究尚显不足。本文旨在探讨睡眠与身体活动水平的关系，具体目标如下：（1）描述挪威基于学校的青少年睡眠和身体活动水平，按照学校层次和性别进行分层；（2）探讨睡眠与身体活动水平之间的关联。方法：数据来源于2022年挪威Ungdata调查，共纳入63,113名来自初中（13至16岁）和高中（16至19岁）的学生。研究变量通过Ungdata调查的单项问题进行测量，并在上课时间通过电子问卷收集。采用粗分析进行逻辑回归，并调整社会经济地位（SES）和年级（年龄）进行校正。结果：在初中，57.0%的女性和44.7%的男性报告睡眠时长不足建议的8小时，而在高中，这一比例分别为74.9%的女性和74.3%的男性。女生在所有学校层次上均报告了更多的睡眠问题，感到在学校或活动中更加疲惫，以及比男生更少的身体活动。睡眠时长是女生在所有学校层次上每周身体活动水平的重要预测因素，其中在高中每周活动5次的人群中，最高几率比为1.32（95% CI [1.24至1.40]）。睡眠时长也是男生在所有学校层次上每周活动5次的预测因素（B＝1.22；95% CI [1.17至1.27]）。结论：约一半的年轻青少年和四分之三的年长青少年未能遵守睡眠建议。女生的身体活动水平普遍低于男生。睡眠时长在性别和学校层次上均能预测至少每周活动5天的可能性高出20至30%。这些发现凸显了睡眠时长与挪威青少年较高身体活动水平之间关系的至关重要性。政府及政策制定者应通过明确将指南纳入课程体系，鼓励健康的睡眠和身体活动习惯。