Robertson Wendy, Stewart-Brown Sarah, Wilcock Elizabeth, Oldfield Michelle, Thorogood Margaret
Health Sciences Research Institute, Warwick Medical School, University of Warwick, Coventry CV4 7AL, UK.
J Obes. 2011;2011. doi: 10.1155/2011/398918. Epub 2010 Oct 3.
Objectives. To investigate the use of accelerometers to monitor change in physical activity in a childhood obesity treatment intervention. Methods. 28 children aged 7-13 taking part in "Families for Health" were asked to wear an accelerometer (Actigraph) for 7-days, and complete an accompanying activity diary, at baseline, 3-months and 9-months. Interviews with 12 parents asked about research measurements. Results. Over 90% of children provided 4 days of accelerometer data, and around half of children provided 7 days. Adequately completed diaries were collected from 60% of children. Children partake in a wide range of physical activity which uniaxial monitors may undermonitor (cycling, nonmotorised scootering) or overmonitor (trampolining). Two different cutoffs (4 METS or 3200 counts·min(-1)) for minutes spent in moderate and vigorous physical activity (MVPA) yielded very different results, although reached the same conclusion regarding a lack of change in MVPA after the intervention. Some children were unwilling to wear accelerometers at school and during sport because they felt they put them at risk of stigma and bullying. Conclusion. Accelerometers are acceptable to a majority of children, although their use at school is problematic for some, but they may underestimate children's physical activity.
目的。研究在儿童肥胖治疗干预中使用加速度计监测身体活动变化的情况。方法。28名7至13岁参加“健康家庭”项目的儿童被要求在基线、3个月和9个月时佩戴加速度计（Actigraph）7天，并完成一份配套的活动日记。对12名家长进行访谈，询问有关研究测量的问题。结果。超过90%的儿童提供了4天的加速度计数据，约一半的儿童提供了7天的数据。从60%的儿童那里收集到了填写完整的日记。儿童参与多种身体活动，单轴监测器可能会对其监测不足（如骑自行车、骑非机动滑板车）或监测过度（如蹦床）。对于中度至剧烈身体活动（MVPA）的分钟数，两种不同的阈值（4梅脱或3200计数·分钟⁻¹）产生了非常不同的结果，尽管在干预后MVPA缺乏变化这一点上得出了相同的结论。一些儿童不愿意在学校和运动期间佩戴加速度计，因为他们觉得这会让自己有被污名化和欺负的风险。结论。加速度计为大多数儿童所接受，尽管对一些儿童来说在学校使用存在问题，但它们可能会低估儿童的身体活动。
