Department of Exercise Science, University of South Carolina, USA.
J Sci Med Sport. 2011 Nov;14(6):504-11. doi: 10.1016/j.jsams.2011.05.007.
This study synthesized the published estimates of daily moderate-to-vigorous physical activity (MVPAd(-1)) of preschooler-age children (3-5 years).
Meta-analysis of previously published studies reporting accelerometer-derived estimates of daily MVPA of preschoolers.
A comprehensive literature review was conducted to identify studies published by March 2010 that reported daily minutes of accelerometer-derived MVPA in preschool-age children (3-5 years). Random effects point estimates and 95% confidence intervals (95% CIs) were calculated based on study weighted means and standard deviations of raw accelerometer counts per minute (cpm) and reported minutes of MVPA and/or percentage of time spent in MVPAd(-1).
29 articles representing 6309 preschoolers were included. Overall, preschoolers engaged in 42.8 min (95% CI 28.9-56.8) of MVPAd(-1), and 54.4 min (95% CI 29.9-78.9) and 45.4 min (95% CI 25.2-65.6) for boys and girls separately. This translated into approximately 5.5% (95% CI 3.7-7.2%) of time spent in MVPAd(-1), and 7.1% (95% CI 3.9-10.3%) for boys and 6.3% (95% CI 3.9-8.7%) for girls. Studies (76%) using ActiGraph accelerometers reported an average of 714 cpm (95% CI 678-751), with boys and girls having 783 cpm (95% CI 753-813) and 696 cpm (95% CI 665-727), respectively.
Interpretation of accelerometer-derived MVPA is confounded by differences in cutpoints applied within a study. Great care, therefore, should be taken when interpreting the activity levels of preschoolers to inform policy decisions, such as the development of physical activity guidelines. Hence, considerable attention is required to unify accelerometer-derived MVPA so that unbiased comparisons across studies can be made.
本研究综合了已发表的学龄前儿童（3-5 岁）每日中等到剧烈体力活动（MVPA）的估计值。
对以前发表的研究进行元分析，这些研究报告了使用加速度计估计的学龄前儿童的每日 MVPA。
进行了全面的文献回顾，以确定截至 2010 年 3 月发表的研究报告，这些研究报告报告了学龄前儿童（3-5 岁）每日加速度计衍生的 MVPA 分钟数。根据研究加权平均值和每分钟原始加速度计计数（cpm）和报告的 MVPA 分钟数和/或 MVPA 时间百分比的标准差，计算随机效应点估计值和 95%置信区间（95%CI）。
29 篇文章代表了 6309 名学龄前儿童。总体而言，学龄前儿童每天进行 42.8 分钟（95%CI 28.9-56.8）的 MVPA，男孩和女孩分别为 54.4 分钟（95%CI 29.9-78.9）和 45.4 分钟（95%CI 25.2-65.6）。这相当于大约 5.5%（95%CI 3.7-7.2%）的时间用于 MVPA，男孩为 7.1%（95%CI 3.9-10.3%），女孩为 6.3%（95%CI 3.9-8.7%）。使用 ActiGraph 加速度计的研究（76%）报告平均每分钟 714 cpm（95%CI 678-751），男孩和女孩分别为每分钟 783 cpm（95%CI 753-813）和 696 cpm（95%CI 665-727）。
在研究中应用不同的切点会混淆加速度计衍生的 MVPA 的解释。因此，在为政策决策提供信息时，如制定体力活动指南，在解释学龄前儿童的活动水平时应格外小心。因此，需要相当大的关注来统一加速度计衍生的 MVPA，以便可以在研究之间进行无偏见的比较。
