Dall P M, Skelton D A, Dontje M L, Coulter E H, Stewart S, Cox S R, Shaw R J, Čukić I, Fitzsimons C F, Greig C A, Granat M H, Der G, Deary I J, Chastin Sfm
Institute of Applied Health research, School of Health & Life Sciences, Glasgow Caledonian University, Glasgow, UK.
School of Population and Global Health, University of Western Australia, Perth, Australia.
J Meas Phys Behav. 2018 Mar;1(1):26-31. doi: 10.1123/jmpb.2017-0004.
The Seniors USP study measured sedentary behaviour (activPAL3, 9 day wear) in older adults. The measurement protocol had three key characteristics: enabling 24-hour wear (monitor location, waterproofing); minimising data loss (reducing monitor failure, staff training, communication); and quality assurance (removal by researcher, confidence about wear). Two monitors were not returned; 91% (n=700) of returned monitors had 7 valid days of data. Sources of data loss included monitor failure (n=11), exclusion after quality assurance (n=5), early removal for skin irritation (n=8) or procedural errors (n=10). Objective measurement of physical activity and sedentary behaviour in large studies requires decisional trade-offs between data quantity (collecting representative data) and utility (derived outcomes that reflect actual behaviour).
老年人USP研究测量了老年人的久坐行为（activPAL3，佩戴9天）。测量方案有三个关键特征：支持24小时佩戴（监测器位置、防水）；尽量减少数据丢失（减少监测器故障、工作人员培训、沟通）；以及质量保证（由研究人员移除、对佩戴情况的信心）。有两台监测器未归还；91%（n = 700）归还的监测器有7天有效数据。数据丢失的原因包括监测器故障（n = 11）、质量保证后被排除（n = 5）、因皮肤刺激提前移除（n = 8）或程序错误（n = 10）。在大型研究中，对身体活动和久坐行为进行客观测量需要在数据量（收集代表性数据）和效用（反映实际行为的衍生结果）之间进行决策权衡。
