Hwang Jungyun, Fernandez Austin Michael, Lu Amy Shirong
Department of Communication Studies, College of Arts, Media and Design, Northeastern University, Boston, MA 02115, USA.
Department of Health Sciences, Bouvé College of Health Sciences, Northeastern University, Boston, MA 02115, USA.
J Clin Med. 2018 Sep 11;7(9):268. doi: 10.3390/jcm7090268.
We assessed the agreement of two ActiGraph activity monitors (wGT3X vs. GT9X) placed at the hip and the wrist and determined an appropriate epoch length for physical activity levels in an exergaming setting. Forty-seven young adults played a 30-min exergame while wearing wGT3X and GT9X on both hip and wrist placement sites and a heart rate sensor below the chest. Intraclass correlation coefficient indicated that intermonitor agreement in steps and activity counts was excellent on the hip and good on the wrist. Bland-Altman plots indicated good intermonitor agreement in the steps and activity counts on both placement sites but a significant intermonitor difference was detected in steps on the wrist. Time spent in sedentary and physical activity intensity levels varied across six epoch lengths and depended on the placement sites, whereas time spent from a 1-s epoch of the hip-worn monitors most accurately matched the relative exercise intensity by heart rate. Hip placement site was associated with better step-counting accuracy for both activity monitors and more valid estimation of physical activity levels. A 1-s epoch was the most appropriate epoch length to detect short bursts of intense physical activity and may be the best choice for data processing and analysis in exergaming studies examining intermittent physical activities.
我们评估了放置在髋部和腕部的两款ActiGraph活动监测器（wGT3X与GT9X）之间的一致性，并确定了在运动游戏环境中适合身体活动水平的合适时间间隔长度。47名年轻人在髋部和腕部佩戴wGT3X和GT9X，同时在胸部下方佩戴心率传感器，进行了30分钟的运动游戏。组内相关系数表明，监测器之间在髋部步数和活动计数方面的一致性极佳，在腕部则良好。Bland-Altman图表明，两个放置部位在步数和活动计数方面监测器之间的一致性良好，但在腕部步数上检测到显著的监测器间差异。久坐和身体活动强度水平所花费的时间在六个时间间隔长度中有所不同，并且取决于放置部位，而髋部佩戴监测器1秒时间间隔所花费的时间最准确地与心率相对运动强度相匹配。髋部放置部位对于两款活动监测器的步数计数准确性更高，并且对身体活动水平的估计更有效。1秒的时间间隔长度是检测剧烈身体活动短爆发的最合适时间间隔长度，并且可能是在研究间歇性身体活动的运动游戏研究中进行数据处理和分析的最佳选择。
