Center for Behavioral Epidemiology and Community Health, San Diego State University, San Diego, California, USA.
J Sports Sci. 2012;30(13):1429-35. doi: 10.1080/02640414.2012.710761. Epub 2012 Aug 2.
In this study, we evaluated agreement among three generations of ActiGraph™ accelerometers in children and adolescents. Twenty-nine participants (mean age = 14.2 ± 3.0 years) completed two laboratory-based activity sessions, each lasting 60 min. During each session, participants concurrently wore three different models of the ActiGraph™ accelerometers (GT1M, GT3X, GT3X+). Agreement among the three models for vertical axis counts, vector magnitude counts, and time spent in moderate-to-vigorous physical exercise (MVPA) was evaluated by calculating intraclass correlation coefficients and Bland-Altman plots. The intraclass correlation coefficient for total vertical axis counts, total vector magnitude counts, and estimated MVPA was 0.994 (95% CI = 0.989-0.996), 0.981 (95% CI = 0.969-0.989), and 0.996 (95% CI = 0.989-0.998), respectively. Inter-monitor differences for total vertical axis and vector magnitude counts ranged from 0.3% to 1.5%, while inter-monitor differences for estimated MVPA were equal to or close to zero. On the basis of these findings, we conclude that there is strong agreement between the GT1M, GT3X, and GT3X+ activity monitors, thus making it acceptable for researchers and practitioners to use different ActiGraph™ models within a given study.
在这项研究中，我们评估了三代 ActiGraph™ 加速度计在儿童和青少年中的一致性。29 名参与者（平均年龄=14.2±3.0 岁）完成了两次基于实验室的活动，每次持续 60 分钟。在每次活动中，参与者同时佩戴三种不同型号的 ActiGraph™ 加速度计（GT1M、GT3X、GT3X+）。通过计算组内相关系数和 Bland-Altman 图来评估三个模型之间在垂直轴计数、向量幅度计数和中等到剧烈体力活动（MVPA）时间方面的一致性。总垂直轴计数、总向量幅度计数和估计的 MVPA 的组内相关系数分别为 0.994（95%置信区间=0.989-0.996）、0.981（95%置信区间=0.969-0.989）和 0.996（95%置信区间=0.989-0.998）。总垂直轴和向量幅度计数的监视器间差异范围为 0.3%至 1.5%，而估计的 MVPA 的监视器间差异等于或接近零。基于这些发现，我们得出结论，GT1M、GT3X 和 GT3X+活动监测器之间具有很强的一致性，因此研究人员和从业者在给定研究中使用不同的 ActiGraph™ 模型是可以接受的。
