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Abstract：
OBJECTIVE: Public health organizations recommend that preschool-aged children accumulate at least 3h of physical activity (PA) daily. Objective monitoring using pedometers offers an opportunity to measure preschooler\'s PA and assess compliance with this recommendation. The purpose of this study was to derive step-based recommendations consistent with the 3h PA recommendation for preschool-aged children.
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.
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.
摘要：
目的：公共卫生组织建议学龄前儿童每天至少积累3小时的体力活动（PA）。使用计步器进行客观监测为测量学龄前儿童的PA和评估对该建议的依从性提供了机会。这项研究的目的是得出与学龄前儿童3hPA建议一致的基于步骤的建议。
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。
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。
