Western Norway University of Applied Sciences, Faculty of Education, Arts and Sports, Department of Sport, Food and Natural Sciences, Campus Sogndal, Sogndal, Norway.
Prev Med. 2021 Apr;145:106437. doi: 10.1016/j.ypmed.2021.106437. Epub 2021 Jan 23.
The evidence regarding associations between intensity-specific physical activity and adiposity in young children is conflicting. Moreover, the evidence is limited by analytical approaches that cannot handle the multicollinearity among multiple variables across the entire intensity spectrum. We aimed to determine the multivariate physical activity intensity signature associated with body mass index in a large sample of preschool children aged 3-6 years. 1182 Norwegian preschool children (mean age 4.7 years, 51% boys) provided data on physical activity (ActiGraph GT3X+) and body mass index during 2015-2016. Multivariate pattern analysis was used to determine associations between the entire triaxial intensity spectra (time spent in intensities from 0-99 to ≥ 15000 counts per minute) and body mass index in the total sample and in subgroups split by sex and age (median split). The association patterns were comparable across the three axes. For the vertical axis, associations were negative for time spent sedentary (0-99 counts per minute), positive for time spent in lower intensities (100-2999 counts per minute), and negative for time spent in vigorous intensities (4000-12,999 counts per minute). Associations were stronger in older than in younger children and no associations were observed for vigorous intensities among younger children. Association patterns were comparable for boys and girls. In conclusion, we found clear associations with body mass index across the physical activity intensity spectrum in preschool children. However, the age-specific association patterns suggest negative (unfavorable) associations with vigorous physical activity intensities develop around 5-6 years of age.
关于幼儿的特定强度体力活动与肥胖之间的关联，证据相互矛盾。此外，由于分析方法无法处理整个强度范围内多个变量之间的多重共线性，因此证据有限。我们旨在确定与大量 3-6 岁学龄前儿童的体重指数相关的多变量体力活动强度特征。1182 名挪威学龄前儿童（平均年龄 4.7 岁，51%为男孩）在 2015-2016 年期间提供了关于体力活动（ActiGraph GT3X+）和体重指数的数据。多元模式分析用于确定整个三轴强度谱（0-99 至≥15000 计数/分钟的时间）与总样本以及按性别和年龄（中位数分割）划分的子组中体重指数之间的关联。关联模式在三个轴上是可比的。对于垂直轴，0-99 计数/分钟的久坐时间呈负相关，100-2999 计数/分钟的低强度时间呈正相关，4000-12999 计数/分钟的剧烈强度时间呈负相关。在年龄较大的儿童中，关联更强，而在年龄较小的儿童中，剧烈强度没有关联。男孩和女孩的关联模式相似。总之，我们在学龄前儿童的体力活动强度谱中发现了与体重指数的明确关联。然而，特定年龄的关联模式表明，大约在 5-6 岁左右，与剧烈体力活动强度之间存在负面（不利）关联。
