Harrison Flo, Atkin Andrew J, van Sluijs Esther M F, Jones Andy P
Norwich Medical School and UKCRC Centre for Diet and Activity Research (CEDAR), University of East Anglia, Norwich NR4 7TJ, United Kingdom.
MRC Epidemiology Unit and UKCRC Centre for Diet and Activity Research (CEDAR), University of Cambridge School of Clinical Medicine, Cambridge CB2 0QQ, United Kingdom.
Prev Med Rep. 2017 Apr 29;7:16-19. doi: 10.1016/j.pmedr.2017.04.006. eCollection 2017 Sep.
Accelerometer-based studies of children's physical activity have reported seasonal patterns in activity levels. However, the inability of many accelerometers to detect activity while the wearer is swimming or cycling may introduce a bias to the estimation of seasonality if participation in these activities are themselves seasonally patterned. We explore seasonal patterns in children's swimming and cycling among a sample of 7-8 year olds ( = 591) participating in the Millennium Cohort Study, UK. Participating children wore an accelerometer for one week on up to five occasions over the year and their parents completed a diary recording daily minutes spent swimming and cycling. Both swimming and cycling participation showed seasonal patterns, with 2.7 (SE 0.8) more minutes swimming and 5.7 (0.7) more minutes cycling performed in summer compared to winter. Adding swimming and cycling time to accelerometer-determined MVPA increased the summer-winter difference in MVPA from 16.6 (1.6) to 24.9 min. The seasonal trend in swimming and cycling appears to follow the same pattern as accelerometer-measured MVPA. Studies relying solely on accelerometers may therefore underestimate seasonal differences in children's activity.
基于加速度计对儿童身体活动的研究报告了活动水平的季节性模式。然而，如果游泳或骑自行车等活动本身存在季节性模式，许多加速度计在佩戴者游泳或骑自行车时无法检测到活动，这可能会给季节性估计带来偏差。我们在参与英国千禧队列研究的7至8岁儿童样本（n = 591）中探索了儿童游泳和骑自行车的季节性模式。参与研究的儿童在一年中最多五次佩戴加速度计一周，他们的父母完成了一份日记，记录每天花在游泳和骑自行车上的分钟数。游泳和骑自行车的参与情况均呈现季节性模式，与冬季相比，夏季游泳时间多2.7（标准误0.8）分钟，骑自行车时间多5.7（0.7）分钟。将游泳和骑自行车的时间添加到加速度计确定的中度至剧烈身体活动（MVPA）中，使MVPA的夏季与冬季差异从16.6（1.6）分钟增加到24.9分钟。游泳和骑自行车的季节性趋势似乎与加速度计测量的MVPA遵循相同的模式。因此，仅依赖加速度计的研究可能会低估儿童活动的季节性差异。
