Physical activity in Ontario preschoolers: prevalence and measurement issues
Physical activity in Ontario preschoolers: prevalence and measurement issues
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DOI：
10.1139/h11-002
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发表时间：
2011-04-01
影响因子：
3.4
通讯作者：
Timmons, Brian W.
中科院分区：
文献类型：
--
作者：
Obeid, Joyce;Thanh Nguyen;Timmons, Brian W.
幼儿时期是发展积极生活行为的关键时期；然而，人们对加拿大学龄前儿童的体力活动水平知之甚少。这项研究的目的是(I)通过使用高频加速度计检查安大略省学龄前儿童样本中的体力活动，以确定活动和步数；(Ii)评估步数和体力活动之间的关系；(Iii)检查历时长度或采样间隔对体力活动的影响；以及(Iv)将测量的体力活动与现有的建议进行比较。30名3至5岁的儿童佩戴加速度计，监测3-S时代7天内的习惯性体力活动。学龄前儿童平均每天从事220min的体力活动，其中75min用于中等到剧烈的体力活动(MVPA)，他们的累积步数为7529+/-1539步。学龄前儿童参与的MVPA越多，每天走的步数也越多(r=0.81p<；0.001)。与3-S时期相比，15、30和60个S的采样间隔导致平均每天错过MVPA时间分别为2.9、9.0和16.7分钟。所有30名学龄前儿童都符合国家体育运动协会的建议，即学龄前儿童每天至少进行120分钟的总体力活动。我们的数据强调了测量学龄前儿童体力活动时的重要方法学考虑因素，以及为加拿大儿童制定学龄前特定体力活动指南的必要性。
Early childhood is a critical period for the development of active living behaviours; however, very little is known about the physical activity levels of preschoolers from Canada. The objectives of this study were to (i) examine physical activity in a sample of Ontario preschoolers by using high-frequency accelerometry to determine activity and step counts; (ii) assess the relationship between step counts and physical activity; (iii) examine the influence of epoch length or sampling interval on physical activity; and (iv) compare measured physical activity to existing recommendations. Thirty 3- to 5-year-old children wore accelerometers to monitor habitual physical activity in 3-s epochs over a 7-day period. Preschoolers engaged in an average of 220 min of daily physical activity, 75 min of which were spent in moderate-to-vigorous physical activity (MVPA), and they accumulated 7529 +/- 1539 steps.day(-1). Preschoolers who engaged in more MVPA also took more steps on a daily basis (r = 0.81, p < 0.001). Compared with a 3-s epoch, sampling intervals of 15, 30, and 60 s resulted in an average of 2.9, 9.0, and 16.7 missed minutes of MVPA per day, respectively. All 30 preschoolers met the National Association for Sport and Physical Education recommendation of at least 120 min of total physical activity per day for preschool-age children. Our data highlight important methodological considerations when measuring physical activity in preschoolers and the need for preschool-specific physical activity guidelines for Canadian children.