Department of Exercise, Nutrition, and Health Sciences, University of Bristol, Bristol, United Kingdom.
Am J Prev Med. 2010 Feb;38(2):178-83. doi: 10.1016/j.amepre.2009.10.036.
Walking to school is associated with higher levels of physical activity, but the contribution of the journey itself to physical activity before school is unknown.
This study combined accelerometer and GPS data to investigate the level and location of physical activity in children walking to school.
Participants were 137 children (aged 11.3 + or - 0.3 years) from London, England, measured in June-July 2006. Physical activity was measured by accelerometry, and location was determined with a GPS receiver. Travel mode was self-reported. Accelerometer and GPS data were time-matched to provide activity level and location for each 10-second epoch where both were available. Journeys were mapped in a GIS.
Mean accelerometer counts per minute before school (8:00 am to 9:00 am) were 43% higher in those who walked to school than those traveling by car (878.8 + or - 387.6 vs 608.7 + or - 264.1 counts per minute [cpm], p<0.001). Eleven percent (4.5 minutes) of daily moderate to vigorous physical activity (MVPA) occurred in this hour, with walkers recording 2.1 minutes more than car travelers (p = 0.004). Children followed direct routes between home and the school playground. Total activity during the walk to school was twice that in the playground (2131.3 + or - 1170.7 vs 1089.7 + or - 938.6 cpm, p<0.001), with the journey contributing three times as much MVPA as time in the playground.
Our results provide evidence that the journey to school is purposeful and contributes to higher total physical activity and MVPA in children. Combining accelerometer and GPS data may aid our understanding of the environmental context of physical activity.
步行上学与更高水平的身体活动有关，但上学途中的活动本身对上学前的身体活动的贡献尚不清楚。
本研究结合加速度计和 GPS 数据，调查儿童步行上学的身体活动水平和位置。
参与者是来自英国伦敦的 137 名儿童（年龄 11.3 ± 0.3 岁），于 2006 年 6 月至 7 月进行测量。身体活动通过加速度计测量，位置通过 GPS 接收器确定。出行方式为自我报告。将加速度计和 GPS 数据进行时间匹配，为每个 10 秒的时间间隔提供活动水平和位置，只要这两个数据都可用。在 GIS 中绘制行程图。
上学前（8：00 am 至 9：00 am）的平均每分钟加速度计计数，步行上学的儿童比乘车上学的儿童高 43%（878.8 ± 387.6 与 608.7 ± 264.1 计数/分钟[cpm]，p<0.001）。这一小时内，日常中到剧烈体力活动（MVPA）的 11%（4.5 分钟）发生在此期间，步行者比乘车者多记录 2.1 分钟（p = 0.004）。儿童遵循从家到学校操场的直接路线。上学步行过程中的总活动量是在操场上的两倍（2131.3 ± 1170.7 与 1089.7 ± 938.6 cpm，p<0.001），而这段旅程的 MVPA 是在操场上的三倍。
我们的研究结果提供了证据表明，上学的路程是有目的的，有助于提高儿童的总身体活动量和 MVPA。结合加速度计和 GPS 数据可能有助于我们理解身体活动的环境背景。
