Florez-Pregonero Alberto, Meckes Nathanael, Buman Mathew, Ainsworth Barbara E
Departamento de Formación, Facultad de Educación, Pontificia Universidad Javeriana, Bogota, Distrito Capital 11001000, Colombia.
Department of Exercise and Sport Science, School of Behavioral and Applied Sciences, Azuza Pacific University, Azuza, CA 91702, USA.
J Sport Health Sci. 2017 Mar;6(1):103-110. doi: 10.1016/j.jshs.2016.10.005. Epub 2016 Oct 21.
Wearable monitors (WMs) are used to estimate the time spent in sedentary behaviors (SBs) and light-intensity physical activities (LPAs) and their associated energy cost; however, the accuracy of WMs in measuring behaviors on the lower end of the intensity spectrum is unclear. The aim of this study was to assess the validity of 3 WMs (ActiGraph GT3X+; PAL, and SenseWear 2) in estimating the intensity of SB and LPA in adults as compared with the criterion measure of oxygen uptake (VO) measured by indirect calorimetry.
Sixteen participants (age: 25.38 ± 8.58 years) wore the ActiGraph GT3X+, PAL, and SenseWear 2 devices during 7 sedentary-to-light activities. VO (mL/kg/min) was estimated by means of a portable gas analyzer, Oxycon Mobile (Carefusion, Yorba Linda, CA, USA). All data were transformed into metabolic equivalents and analyzed using mean percentage error, equivalence plots, Bland-Altman plots, kappa statistics, and sensitivity/specificity.
Mean percentage error was lowest for the PAL for SB (14.9%) and LPA (9.3%) compared with other WMs, which were >21.2%. None of the WMs fell within the equivalency range of ±10% of the criterion mean value. Bland-Altman plots revealed narrower levels of agreement with all WMs for SB than for LPA. Kappa statistics were low for all WMs, and sensitivity and specificity varied by WM type.
None of the WMs tested in this study were equivalent with the criterion measure (VO) in estimating sedentary-to-light activities; however, the PAL had greater overall accuracy in measuring SB and LPA than did the ActiGraph and SenseWear 2 monitors.
可穿戴监测器（WMs）用于估计久坐行为（SBs）和轻度体力活动（LPAs）所花费的时间及其相关能量消耗；然而，WMs在测量强度谱低端行为时的准确性尚不清楚。本研究的目的是评估三种WMs（ActiGraph GT3X+、PAL和SenseWear 2）与通过间接量热法测量的摄氧量（VO）这一标准测量方法相比，在估计成年人SB和LPA强度方面的有效性。
16名参与者（年龄：25.38±8.58岁）在7种从久坐到轻度活动的过程中佩戴ActiGraph GT3X+、PAL和SenseWear 2设备。通过便携式气体分析仪Oxycon Mobile（Carefusion，美国加利福尼亚州约巴林达）估计VO（毫升/千克/分钟）。所有数据均转换为代谢当量，并使用平均百分比误差、等效性图、Bland-Altman图、kappa统计以及敏感性/特异性进行分析。
与其他WMs（>21.2%）相比，PAL在测量SB（14.9%）和LPA（9.3%）时的平均百分比误差最低。没有一种WMs落在标准平均值±10%的等效范围内。Bland-Altman图显示，所有WMs在测量SB时的一致性水平比测量LPA时更窄。所有WMs的kappa统计值都很低，并且敏感性和特异性因WM类型而异。
本研究中测试的WMs在估计久坐到轻度活动方面均与标准测量方法（VO）不等效；然而，PAL在测量SB和LPA方面的总体准确性高于ActiGraph和SenseWear 2监测器。
