运用Actigraph GT3X三轴加速度传感器测量成年及老年男性人群步行的信效度研究

Reliability and Validity of the Actigraph GT3X Accelerometer for Measuring Walking and Running of Chinese Men

评价Actigraph GT3X三轴加速度传感器测量中国男性人群典型体力互动信效度,开发基于中国人群步行活动模式的GT3X三轴加速度传感器能耗推算方程。方法受试对象包括青年组(21.92±1.14岁),老年组(55.5±4.52岁)。受试者佩戴GT3X三轴加速度传感器,在跑台上分别完成3km/h(慢走)、4.5km/h(正常步行)、4.5km/h10%(上坡步行)、6km/h(快走)以及7.5km/h(慢跑)速度的走跑运动各5min。受试者佩戴COSMED K4b2便携式代谢测试仪,并将GT3X三轴加速度传感器佩戴于髋部,同步采集心肺功能仪及加速度传感器数据。结果根据受试对象4种无坡度走跑运动推导出线性方程MET=0.000653*counts(Axis1)+2.345521以及线性方程MET=0.000689*counts(VM)+1.640721,但其相关系数不高;GT3X+三轴加速度传感器记录上坡步行(4.5km/h10%)运动与无坡度运动(4.5km/h)相比,三轴counts及VM均显示有差异性(P<0.05),但counts增加率远低于MET增加率;GT3X+三轴加速度传感器两次重复测试,pearson值高,即离散程度低。结论本研究推导垂直轴(Axis1)、三轴矢量和(VM)的线性方程,为中度相关,误差值较大,且上坡运动时的GT3X+三轴加速度传感器记录counts值与MET值呈非线性相关,提示Actigraph GT3X三轴加速度传感器能耗推算方程可根据不同运动方式、运动强度推算相对应方程;Actigraph GT3X三轴加速度传感器测量我国成年及老年男性人群步行活动其信度较高。

Objective： To evaluate its reliability and validity for monitoring typical physical activity of Chinese Men by the Actigraph GT3 X accelerometer,the purpose of this study to develop energy consumption algorithms suitable of physical activity for Chinese Men. Methods： The participants including young group（ 21. 92 ＋ 1. 14 yr）,aged group（ 55. 5 ＋ 4. 52yr）,wore the GT3 X accelerometer during walking or running,when they completed five minutes exercise respectively at 3km / h（ walking）,4. 5km / h（ normal walking）,4. 5km/h10%（ uphill walking）,6km/h（ brisk walking） and 7. 5km / h（ jogging） on a treadmill.The participants wearing the K4b2 Cosmed and wearing the GT3 X accelerometer on the hip,and synchronous data acquisition. Results： According to the participants of 4 models（ non slope walking and running） is derived energy consumption algorithms： MET = 0. 000653 ＊ counts（ Axis1）＋ 2. 345521; MET = 0. 000689 ＊ counts（ VM） ＋1. 640721,but the correlation coefficient is not high; Contrast the records of upslope walking（ 4. 5km / h10%） with no slope walking（ 4. 5km / h）,three axis counts and VM showed the difference of which was statistically significant（ P〈0. 05）,but the increase rate of counts is far lower than the MET; Repeated testing by the GT3 X accelerometer,it showed high Pearson value,which meaning the dis-crete degree is low. Conclusion： This study derived energy consumption algorithms of Axis and VM,it showed moderate correlation,but error is larger. With upslope walking the GT3 X accelerometer recorded counts—MET is nonlinear correlated,which prompt the different model and intensity derived different energy consumption algorithms by GT3 X ＋ accelerometer; Actigraph GT3 X accelerometer which reliability is high.