Technical reliability of the CSA activity monitor: The EarlyBird Study
Technical reliability of the CSA activity monitor: The EarlyBird Study
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DOI：
10.1097/00005768-200209000-00022
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发表时间：
2002-09-01
期刊：
影响因子：
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通讯作者：
Wilkin, TJ
中科院分区：
文献类型：
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作者：
Metcalf, BS;Curnow, JSH;Wilkin, TJ
目的：评价CSA加速度计活动监测仪的技术性能。方法：对23台CSA监护仪进行了仪器内和仪器间变异性测试。CSA监视器测量加速度的变化。并且通过在两个固定基线速度（快速和中等）周围产生速度的正弦变化来测试精度。使用倾斜块改变监视器与沿沿着转盘半径的力线的角度。进行了三组试验。1.仪器内变异性：在四个象限的每个象限中对七台显示器进行三次测试。2.所有23台监护仪均用于仪器间测试。3.在6台显示器上进行了15度、30度和45度倾斜的影响。结果如下：快速或中速的仪器内变异系数（CV）从未超过2%，并分别达到0.92和0.84的“运行间”类内相关系数（ICC）。在重复性方面，两种监测器之间没有显著差异（快速：P = 0.97，中等：P = 0.77）。虽然监测器之间的平均得分有显着差异，仪器间的变异性不超过5%，在任何速度。快速批次间ICC范围为0.87 - 0.98，培养基批次间ICC范围为0.71 - 0.99。角度测试的结果与理论预测的结果非常接近，当显示器从0度倾斜到15度时，平均得分仅损失6%。结论：CSA监测仪为测量实验室环境中的加速度变化提供了精确的工具。从技术上讲，该设备性能良好，很可能被证明是评估儿童和成人身体活动的有用工具。
Purpose: To evaluate the technical performance of the CSA accelerometer-based activity monitor. Methods: Twenty-three CSA monitors were Subjected to intra- and inter-instrument variability tests by controlled trials using a motorized turntable. The CSA monitor measures change in acceleration. and precision was tested by producing sinusoidal variations in speed around two fixed baseline speeds (fast and medium). The angle of the monitor to the line of force along the radius of the turntable was varied using tilted blocks. Three sets of tests were carried out. 1. Intra-instrument variability: seven monitors were tested three times in each of the four quadrants. 2. All 23 monitors were used for inter-instrument tests. 3. The effects of tilt at 15degrees, 30degrees, and 45degrees were carried out on six monitors. Results: Intra-instrument coefficients of variation (CV) never exceeded 2% for fast or medium speed and achieved 'between run' intra-class correlation coefficients (ICC) of 0.92 and 0.84 respectively. There were no significant differences between the monitors in terms of repeatability (fast: P = 0.97, medium: P = 0.77). Although there were significant differences between monitors in terms of mean score, inter-instrument variability did not exceed 5% at either speed. Inter-batch ICCs ranged from 0.87 to 0.98 for fast and from 0.71 to 0.99 for medium. The angle test results corresponded closely to those predicted theoretically, with a loss in mean score of only 6% when the monitor was tilted from 0degrees to 15degrees. Conclusion: The CSA monitor provides a precise tool for measuring changes in acceleration in laboratory settings. Technically the device performs well, and is likely to prove a useful tool in the assessment of physical activity in children and adults.