Berglind Daniel, Hansson Lena, Tynelius Per, Rasmussen Finn
J Phys Act Health. 2017 Feb;14(2):117-122. doi: 10.1123/jpah.2016-0250. Epub 2016 Oct 24.
Levels of physical activity (PA) affect health already at 4 years of age. The aims of this study were to describe levels and patterns of PA and sedentary time (ST) in a sample of 4-year-old Swedish children and to assess the number of children achieving PA guidelines throughout the week.
Data from 540 4-year-old children enrolled in the population-based PRIMROSE trial was used. PA was measured for a period of 1 week by the Actigraph GT3X+ accelerometer. Average PA, time spent in light PA, moderate-to-vigorous PA (MVPA) and ST were assessed.
On average children spent 6.7% of the day in MVPA and 45% of the day being sedentary and 33% (n = 178) of the children met the PA guidelines of 60 minutes of MVPA per day. Boys spent 56.8 (SD 21.8) minutes/day in MVPA, while girls spent 43.0 (SD 18.1) minutes/day in MVPA (P < .001).
Four-year-old children spent almost half of the day being sedentary and only one-third meet the recommended PA guidelines. This finding is alarming as higher levels of PA, already at 4 years of age, seem to reduce the risk of childhood obesity and provides long-term health benefits.
身体活动（PA）水平在4岁时就已对健康产生影响。本研究的目的是描述瑞典4岁儿童样本中的身体活动和久坐时间（ST）水平及模式，并评估一周内达到身体活动指南要求的儿童数量。
使用了参与基于人群的报春花试验的540名4岁儿童的数据。通过Actigraph GT3X+加速度计测量1周的身体活动情况。评估平均身体活动、轻度身体活动时间、中度至剧烈身体活动（MVPA）时间和久坐时间。
儿童平均每天有6.7%的时间处于中度至剧烈身体活动状态，45%的时间处于久坐状态，33%（n = 178）的儿童达到了每天60分钟中度至剧烈身体活动的身体活动指南要求。男孩每天中度至剧烈身体活动的时间为56.8（标准差21.8）分钟，而女孩为43.0（标准差18.1）分钟（P <.001）。
4岁儿童几乎有半天时间处于久坐状态，只有三分之一的儿童达到推荐的身体活动指南要求。这一发现令人担忧，因为4岁时更高水平的身体活动似乎可以降低儿童肥胖风险，并带来长期健康益处。
