Department of Sports Medicine, the Norwegian School of Sport Sciences, Oslo, Norway.
Department of teacher Education and Sport, Sogn and Fjordane University College, Sogndal, Norway.
Scand J Med Sci Sports. 2018 Jan;28(1):161-171. doi: 10.1111/sms.12876. Epub 2017 Apr 10.
The aims of this study were to investigate whether physical activity (PA) and sedentary time (ST) in 9- and 15-year-olds differed between 2005-2006 and 2011-2012 (secular change), and to investigate changes in PA and ST from age 9 to 15 (longitudinal change). In 2005-2006, we invited nationally representative samples of Norwegian 9- (n=1470) and 15-year-olds (n=1348) to participate. In 2011-2012, we invited a new nationally representative sample of 9-year-olds (n=1945), whereas 15-year-olds (n=1759) were invited to participate either based on previous participation in 2005-2006 or from a random sample of schools. We assessed PA and ST objectively using accelerometers. In 2011-2012, both 9- and 15-year-olds spent more time sedentary (≥35.7 min/d, P<.001) and less time in light PA (≥35.2 min/d, P<.001) compared to their peers in 2005-2006. Nine-year-old girls also spent less time in moderate-to-vigorous PA (MVPA) (4.2 min/d, P=.041). In both age groups, the proportion accumulating an average of 60 min/d of MVPA did not differ between the two cohorts. From age 9 to 15, girls and boys decreased their time spent in LPA (≥106.7 min/d, P<.001) and in MVPA (≥20.8 min/d, P<.001). During the same period, ST increased by a mean of >2 h/d (P<.011). We observed an adverse secular change in PA from 2005-2006 to 2011-2012 among 9- and 15-year-olds, and a large decline in PA in the participants followed longitudinally from age 9 to 15 years.
本研究旨在探究 9 岁和 15 岁儿童的身体活动（PA）和久坐时间（ST）在 2005-2006 年至 2011-2012 年间是否存在差异（即是否发生长期变化），以及探究他们从 9 岁到 15 岁期间 PA 和 ST 的变化情况（即是否发生短期变化）。2005-2006 年，我们邀请了具有全国代表性的挪威 9 岁（n=1470）和 15 岁（n=1348）儿童参与研究。2011-2012 年，我们邀请了新的全国代表性的 9 岁儿童样本（n=1945），而 15 岁儿童则是根据之前在 2005-2006 年的参与情况或从学校的随机样本中邀请的。我们使用加速度计对 PA 和 ST 进行了客观评估。2011-2012 年，与 2005-2006 年的同龄人相比，9 岁和 15 岁儿童的久坐时间（≥35.7 分钟/天，P<.001）和轻度 PA 时间（≥35.2 分钟/天，P<.001）都有所增加。9 岁女孩的中等到剧烈 PA（MVPA）时间也减少了（4.2 分钟/天，P=.041）。在这两个年龄组中，两个队列积累平均 60 分钟/天 MVPA 的比例没有差异。从 9 岁到 15 岁，女孩和男孩的 LPA（≥106.7 分钟/天，P<.001）和 MVPA（≥20.8 分钟/天，P<.001）时间都有所减少。在此期间，ST 平均增加了>2 小时/天（P<.011）。我们观察到，9 岁和 15 岁儿童的 PA 在 2005-2006 年至 2011-2012 年间发生了不利的长期变化，并且从 9 岁到 15 岁纵向随访的参与者的 PA 大幅下降。
