Stålesen Jarle, Vik Frøydis Nordgård, Hansen Bjørge Herman, Berntsen Sveinung
Department of Public Health, Sport and Nutrition, Faculty of Health and Sport Sciences, University of Agder, P.O. Box 422, NO-4604 Kristiansand, Norway.
Department of Sports Medicine, Norwegian School of Sport Sciences, Oslo, Norway.
BMC Sports Sci Med Rehabil. 2016 Feb 5;8:2. doi: 10.1186/s13102-016-0028-y. eCollection 2016.
Time spent sedentary appears to be associated with several health outcomes in adults, but findings are inconsistent in children. Further, the assessment of sedentary time represents a major challenge. The objectives of the present study were to determine whether 1) ActiGraph GT3X+, ActivPAL and SenseWear Armband Pro3 (SWA) provide comparable estimates of sedentary time in 9-12-year-old children, 2) these devices are valid compared with direct observation, and 3) ActivPAL discriminates between sitting and standing behavior.
The sample was 67 children. Data were collected during three consecutive days in November 2012. To test the activity monitors in contexts related to physical and sedentary activities commonly performed by children, the children participated in sessions of activity while sitting (watching television, playing video games and tossing a ball while sitting) and standing (musical chairs, active video gaming and tossing a ball) while wearing three different activity monitors at the same time. All activity sessions were observed by two researchers. Differences between monitors were determined using Friedman's two-way analysis of variance by rank order.
Minutes of estimated sedentary time differed across device brands during combined sitting activities: SWA vs. ActiGraph GT3X+ (P = 0.048), SWA vs. ActivPAL, (P < 0.001) and ActiGraph GT3X+ vs. ActivPAL (P = 0.002). Out of 12 min in total of combined recorded sitting activity, SWA reported a median of 6 min (95 % Confidence Interval [CI] = 5.0, 7.0), ActiGraph GT3X+ 7 min (7.0, 8.0) and ActivPAL 10 min (8.6, 10.8) as sedentary time. ActivPAL recorded 3.7 (2.4, 4.0) minutes of the non-sitting activities 'musical chairs', 4.0 (4.0, 4.0) minutes in 'standing ball toss'; and 4.0 (2.7, 4.0) minutes in 'active video gaming' as sitting time.
Recorded sedentary time varied among the monitors GT3X+, SWA and ActivPAL, and misclassification of standing activities as sitting activities were apparent for ActivPAL in certain activities.
久坐时间似乎与成年人的多种健康结果相关，但在儿童中的研究结果并不一致。此外，久坐时间的评估是一项重大挑战。本研究的目的是确定：1）ActiGraph GT3X+、ActivPAL和SenseWear Armband Pro3（SWA）是否能提供9至12岁儿童久坐时间的可比估计值；2）与直接观察相比，这些设备是否有效；3）ActivPAL能否区分坐姿和站姿行为。
样本为67名儿童。2012年11月连续三天收集数据。为了在儿童通常进行的身体活动和久坐活动相关的情境中测试活动监测器，儿童在同时佩戴三种不同活动监测器的情况下，分别参与了坐姿（看电视、玩电子游戏和坐着扔球）和站姿（抢椅子游戏、主动式电子游戏和扔球）的活动环节。所有活动环节均由两名研究人员进行观察。使用Friedman双向秩次方差分析确定监测器之间的差异。
在综合坐姿活动期间，不同品牌设备估计的久坐时间分钟数存在差异：SWA与ActiGraph GT3X+相比（P = 0.048），SWA与ActivPAL相比（P < 0.001），ActiGraph GT3X+与ActivPAL相比（P = 0.002）。在总共12分钟的综合记录坐姿活动中，SWA报告的久坐时间中位数为6分钟（95%置信区间[CI] = 5.0，7.0），ActiGraph GT3X+为7分钟（7.0，8.0），ActivPAL为10分钟（8.6，10.8）。ActivPAL将“抢椅子”这种非坐姿活动记录为3.7（2.4，4.0）分钟的坐姿时间，“站立扔球”为4.0（4.0，4.0）分钟，“主动式电子游戏”为4.0（2.7，4.0）分钟。
GT3X+、SWA和ActivPAL监测器记录的久坐时间各不相同，并且在某些活动中，ActivPAL明显将站立活动误分类为坐姿活动。
