METHODS: The study sample comprised 916 preschool-aged children, aged 3 to 6years (mean age=5.0±0.8years). Children were recruited from kindergartens located in Portugal, between 2009 and 2013. Children wore an ActiGraph GT1M accelerometer that measured PA intensity and steps per day simultaneously over a 7-day monitoring period. Receiver operating characteristic (ROC) curve analysis was used to identify the daily step count threshold associated with meeting the daily 3hour PA recommendation.
RESULTS: A significant correlation was observed between minutes of total PA and steps per day (r=0.76, p<0.001). The optimal step count for ≥3h of total PA was 9099 steps per day (sensitivity (90%) and specificity (66%)) with area under the ROC curve=0.86 (95% CI: 0.84 to 0.88).
CONCLUSIONS: Preschool-aged children who accumulate less than 9000 steps per day may be considered Insufficiently Active.
方法:研究样本包括916名学龄前儿童,3至6岁(平均年龄=5.0±0.8岁)。从葡萄牙的幼儿园招募儿童,2009年至2013年。儿童佩戴了ActiGraphGT1M加速度计,该加速度计在7天的监测期内每天同时测量PA强度和步数。使用受试者工作特征(ROC)曲线分析来鉴定与满足每日3小时PA推荐相关的每日步数阈值。
结果:在总PA的分钟数和每天的步数之间观察到显着的相关性(r=0.76,p<0.001)。总PA≥3小时的最佳步数为每天9099步(敏感性(90%)和特异性(66%)),ROC曲线下面积=0.86(95%CI:0.84至0.88)。
结论:学龄前儿童每天累积不足9000步可能被认为活动不足。