Clinical Exercise Physiology Program, Human Performance Laboratory, Ball State University, Muncie, IN 47306, USA.
Physiol Meas. 2014 Feb;35(2):129-38. doi: 10.1088/0967-3334/35/2/129. Epub 2014 Jan 7.
The triaxial GT3X+ accelerometer can measure activity counts in the vertical, horizontal right to left, horizontal front to back planes, and can generate a summative score of the three axes represented by vector magnitude (VM). Information on the reliability of the GT3X+ at the hip, wrist and ankle sites, over all axes and VM during activities of daily living (ADL) is lacking in the literature. Forty healthy adults (14 men and 26 women) were randomly assigned to perform 10 of 20 ADL (consisting of sedentary, housework, yard work, locomotive and recreational activities) while wearing two monitors on the hip, wrist and ankle. Subjects performed each ADL over 7 min and the mean activity counts during the last 4 min were used for analyses. Average intraclass correlations between monitors were high for the three sites for each axis and VM (hip: 0.943, 0.857, 0.864 and 0.966, respectively; wrist: 0.994, 0.963, 0.961 and 0.989, respectively; ankle: 0.977, 0.979, 0.927 and 0.986, respectively). These data suggest that GT3X+ accelerometers measurements made from the hip, wrist and ankle sites are reliable during ADL across all axes and VM.
三轴 GT3X+ 加速度计可以测量垂直、水平左右、水平前后三个平面的活动计数，并可以生成三个轴的矢量幅度 (VM) 的总和得分。关于 GT3X+ 在髋部、腕部和踝部的可靠性信息，以及在日常生活活动 (ADL) 中所有轴和 VM 的信息在文献中都缺乏。40 名健康成年人（14 名男性和 26 名女性）被随机分配到髋部、腕部和踝部佩戴两个监测器，进行 20 项 ADL 中的 10 项。受试者进行每项 ADL 活动持续 7 分钟，使用最后 4 分钟的平均活动计数进行分析。对于每个轴和 VM，三个部位之间的平均组内相关系数均较高（髋部：分别为 0.943、0.857、0.864 和 0.966；腕部：分别为 0.994、0.963、0.961 和 0.989；踝部：分别为 0.977、0.979、0.927 和 0.986）。这些数据表明，在 ADL 期间，GT3X+ 加速度计在所有轴和 VM 上从髋部、腕部和踝部测量的结果是可靠的。
