Division of Occupational and Environmental Medicine, Epidemiology, Biostatistics and Prevention Institute, University of Zurich and University Hospital Zurich, Zurich, Switzerland.
Epidemiology, Biostatistics and Prevention Institute, University of Zurich, Zurich, Switzerland.
PLoS One. 2021 Jun 2;16(6):e0252659. doi: 10.1371/journal.pone.0252659. eCollection 2021.
The ActiGraph and activPAL monitors are the most frequently used thigh-worn devices to measure motion and posture, but the criterion validity to measure sitting, standing and postural transfer in the office setting is not known. Research question: To examine the criterion validity of the ActiGraph and activPAL activity monitors in repeatedly measuring a variety of different postures and motion in the office setting.
Twenty office workers from the University of Zurich wore an ActiGraph and activPAL during two identical laboratory experiments lasting approximately 60 minutes each, within a maximum of 7 days. The experimental setting consisted of a standard computer office workstation with an electrically powered height-adjustable desk, a swivel chair without arm rests, a standard chair, a footrest, and a bookcase. The protocol consisted of 24 pre-defined tasks mimicking sitting, standing, stepping, and postural transitions around the workplace. All tasks were supervised and observed by the same experimenter.
In repeated measurements (40 individual experiments), the percentages of correctly classified tasks for the ActiGraph and activPAL were, respectively, 100% vs. 85% for sitting, 87% vs. 100% for standing, and 100% vs. 73% for postural transitions. Both monitors correctly identified all stepping tasks. The activPAL misclassified sitting with legs outstretched, and sitting with both feet placed beneath the chair, as standing ~25-70% and 45% of the time, respectively. The ActiGraph misclassified standing with the right foot on a footrest as sitting in 65% of events.
The ActiGraph appears to be slightly more sensitive than the activPAL with respect to the measurement of sitting and postural transitions of short duration, whereas the activPAL seems to be slightly more accurate in capturing standing postures. This knowledge will help guide researchers to choose the best suitable monitor for their research setting.
ActiGraph 和 activPAL 监测器是最常用于测量大腿运动和姿势的设备，但在办公环境中测量坐姿、站立和姿势转换的标准效度尚不清楚。研究问题：检验 ActiGraph 和 activPAL 活动监测器在办公环境中反复测量各种不同姿势和运动的标准效度。
20 名苏黎世大学的上班族在两个最长不超过 7 天的相同实验室实验中佩戴 ActiGraph 和 activPAL 各约 60 分钟。实验环境包括一个标准的电脑办公工作站，配有电动高度可调办公桌、无扶手转椅、标准椅子、脚凳和书架。方案包括 24 个预先定义的任务，模仿在工作场所周围的坐姿、站立、踏步和姿势转换。所有任务均由同一位实验员监督和观察。
在重复测量（40 次个体实验）中，ActiGraph 和 activPAL 的任务分类正确率分别为，坐姿为 100%比 85%，站立为 87%比 100%，姿势转换为 100%比 73%。两个监测器均正确识别了所有踏步任务。activPAL 将坐姿时双腿伸直和双脚放在椅子下面的情况错误地归类为站立，分别有 25-70%和 45%的时间被错误归类。ActiGraph 将右脚放在脚凳上的站立姿势错误地归类为坐姿，占 65%的事件。
ActiGraph 在测量短时间坐姿和姿势转换方面似乎比 activPAL 略敏感，而 activPAL 在捕捉站立姿势方面似乎略准确。这些知识将有助于指导研究人员为其研究环境选择最合适的监测器。
