Department of Sports Medicine, the Norwegian School of Sport Sciences, Oslo, Norway.
Faculty of teacher Education and Sport, Western Norwegian University of Applied Sciences, Campus Sogndal, Sogndal, Norway.
BMC Public Health. 2018 Jun 7;18(1):705. doi: 10.1186/s12889-018-5610-7.
The aim of this study was to investigate how sleep, screen time, active school travel and sport and/or exercise participation associates with moderate-to-vigorous physical activity (MVPA) in nationally representative samples of Norwegian 9- and 15-y-olds, and whether these four behaviors at age nine predict change in MVPA from age nine to 15 years.
We pooled cross-sectional accelerometer and questionnaire data from 9- (n = 2366) and 15-y-olds (n = 1554) that participated in the first (2005/06) and second (2011/12) wave of the Physical Activity among Norwegian Children Study to investigate cross-sectional associations. To investigate prospective associations, we used data from a sub-sample that participated in both waves (at age nine and 15 years, n = 517).
Cross-sectional analyses indicated a modest, inverse association between screen time and MVPA among 9- (- 2.2 min/d (95% CI: -3.1, - 1.3)) and 15-y-olds (- 1.7 min/d (95% CI: -2.7, - 0.8)). Compared to their peers with 0-5 min/d of active travel to school, 9- and 15-y-olds with ≥16 min/d accumulated 7.2 (95% CI: 4.0, 10.4) and 9.0 (95% CI: 3.8, 14.1) more min/d of MVPA, respectively. Nine-y-old boys and 15-y-olds reporting ≥8 h/week of sports and/or exercise participation accumulated 14.7 (95% CI: 8.2, 21.3) and 17.9 (95% CI: 14.0, 21.8) more min/d of MVPA, respectively, than those reporting ≤2 h/week. We found no cross-sectional association between sleep duration and MVPA in either age group. None of the four behaviors predicted change in MVPA from age nine to 15 years (p ≥ 0.102).
Active travel to school and sport/exercise participation may be important targets for future interventions aimed at increasing MVPA in children and adolescents. However, future studies are needed to determine causality.
本研究旨在调查在具有全国代表性的挪威 9 岁和 15 岁儿童样本中，睡眠、屏幕时间、积极上学出行以及运动/锻炼参与度与中等到剧烈体力活动（MVPA）之间的关联，并探讨这四种行为在 9 岁时是否能预测从 9 岁到 15 岁期间 MVPA 的变化。
我们汇总了挪威儿童体力活动研究第一波（2005/06 年）和第二波（2011/12 年）中 9 岁（n=2366）和 15 岁（n=1554）参与者的横断面加速计和问卷调查数据，以调查横断面关联。为了调查前瞻性关联，我们使用了参加两波调查（9 岁和 15 岁，n=517）的子样本数据。
横断面分析表明，9 岁（-2.2 分钟/天（95%CI：-3.1，-1.3））和 15 岁（-1.7 分钟/天（95%CI：-2.7，-0.8））儿童的屏幕时间与 MVPA 呈适度负相关。与每天上学出行时间为 0-5 分钟的同龄人相比，9 岁和 15 岁儿童每天上学出行时间≥16 分钟分别多积累 7.2 分钟（95%CI：4.0，10.4）和 9.0 分钟（95%CI：3.8，14.1）的 MVPA。每周报告运动/锻炼≥8 小时的 9 岁男童和 15 岁儿童分别比每周报告运动/锻炼≤2 小时的儿童多积累 14.7 分钟（95%CI：8.2，21.3）和 17.9 分钟（95%CI：14.0，21.8）的 MVPA。我们在两个年龄组中均未发现睡眠时长与 MVPA 之间存在横断面关联。这四种行为均不能预测从 9 岁到 15 岁期间 MVPA 的变化（p≥0.102）。
积极上学出行和运动/锻炼参与可能是未来针对儿童和青少年增加 MVPA 的干预措施的重要目标。但是，需要进一步的研究来确定因果关系。
