Reliability of the Actigraph GT3X+ Accelerometer in Adults under Free-Living Conditions.
Reliability of the Actigraph GT3X+ Accelerometer in Adults under Free-Living Conditions.
复制标题
DOI：
10.1371/journal.pone.0134606
复制
发表时间：
2015
期刊：
影响因子：
3.7
通讯作者：
Ylvisåker E
中科院分区：
文献类型：
--
作者：
Aadland E;Ylvisåker E
Actigraph GT3X+ 加速度计的可靠性尚未在大量受试者和加速度计单元的正常佩戴时间标准下确定。本研究的目的是评估成人长期自由生活条件下 Actigraph GT3X+ 监测仪的对侧髋关节差异和仪器间可靠性。 87 名成年受试者（28 名男性；平均（标准差）年龄 31.3 (12.2) 岁；体重指数 23.7 (3.1) kg/m2）同时佩戴两个 GT3X+ 加速度计（总共 174 个单位），连接到对侧臀部 21 天。使用 Bland-Altman 图、混合模型回归分析和不同数据积累长度（单日、7 天和 21 天周期）的绝对一致性测量来评估可靠性。对侧髋部之间没有显着差异（效应值≤0.042；p≥.213）。仪器间的可靠性随着数据积累长度的增加而增加。对于 7 天的测量周期（n = 232 周），总体身体活动 (PA) 水平的一致性限制为 ±68 cpm（垂直轴）和 ±81.3 cpm（矢量幅度），久坐时间为 ±51 分钟，轻度 PA 为 ±18.2 分钟，中度 PA 为 ±6.3 分钟，剧烈 PA 为 ±3.5 分钟，中度至剧烈 PA 为 ±6.7 分钟。 Actigraph GT3X+ 加速度计是一种可靠的工具，可使用正常的数据缩减标准在自由生活条件下测量成年人的 PA。对侧髋关节差异非常小。我们建议将加速度计安装在右髋上，并在几天的测量中积累数据。
Reliability of the Actigraph GT3X+ accelerometer has not been determined under normal wear time criteria in a large sample of subjects and accelerometer units. The aim of this study was to assess contralateral hip difference and inter-instrument reliability of the Actigraph GT3X+ monitor in adults under long-term free-living conditions. Eighty-seven adult subjects (28 men; mean (standard deviation) age 31.3 (12.2) years; body mass index 23.7 (3.1) kg/m2) concurrently wore two GT3X+ accelerometers (174 units in total) attached to contralateral hips for 21 days. Reliability was assessed using Bland-Altman plots, mixed model regression analyses and absolute measures of agreement for different lengths of data accumulation (single-day-, 7-day- and 21-day periods). There were no significant differences between contralateral hips (effect size ≤0.042; p ≥.213). Inter-instrument reliability increased with increased length of data-accumulation. For a 7-day measurement period (n = 232 weeks), limits of agreement were ±68 cpm (vertical axis) and ±81.3 cpm (vector magnitude) for overall physical activity (PA) level, ±51 min for sedentary time, ±18.2 min for light PA, ±6.3 min for moderate PA, ±3.5 min for vigorous PA, and ±6.7 min for moderate-to-vigorous PA. The Actigraph GT3X+ accelerometer is a reliable tool for measuring PA in adults under free-living conditions using normal data-reduction criteria. Contralateral hip differences are very small. We suggest accelerometers be attached to the right hip and data to be accumulated over several days of measurement.