Accuracy and precision of two in-shoe pressure measurement systems
Accuracy and precision of two in-shoe pressure measurement systems
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DOI：
10.1080/00140130210136963
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发表时间：
2002-06-20
期刊：
影响因子：
2.4
通讯作者：
Weatherly, M
中科院分区：
文献类型：
--
作者：
Hsiao, HW;Guan, JH;Weatherly, M
最近迅速采用的鞋垫压力测量系统的临床和人体工程学评估的人的步态有必要全面了解这种系统的准确性和精度。进行了五个台架实验来检查Pedar和F-Scan鞋内压力测量系统。检查的鞋垫是Pedar Y尺寸的右鞋垫和修剪成Pedar Y尺寸鞋垫的尺寸和形状的F扫描鞋垫。在不同的施加压力水平、校准程序、压力施加持续时间、鞋垫使用年龄和实验日或周，以50 Hz采样数据。系统精度由测量误差百分比决定，系统精度由测量误差百分比的95%容许区间决定。结果表明，系统的准确度和精度随施加压力的水平、校准程序、施加压力的持续时间和鞋垫使用年限而变化。当鞋垫是新的并且在（1）制造商规定的系统校准之后、（2）在50-500 kPa压力范围内和（3）施加压力后几秒内进行测量时，Pedar系统显示出最大的准确度和精确度。在此条件下，测量误差在-0.6%至2.7%范围内，95%公差区间的大小（上限减去下限）为13.5%至18.7%。不建议使用Pedar系统测量小于35 kPa的压力。为确保F-Scan系统的准确性和精密度，建议用户先估计所施加的压力范围，然后选择类似的压力水平进行校准。在此条件下，测量误差在1.3-5.8%范围内，95%容许区间的幅度（上限减去下限）估计在1.1- 14.8%范围内。当校准压力超出该施加压力范围时，误差百分比相当高，范围为-26.3%至33.9%。
The recent rapid adoption of insole pressure measurement systems for clinical and ergonomic evaluations of human gait has necessitated a comprehensive understanding of the accuracy and precision of such systems. Five bench experiments were performed to examine the Pedar and F-Scan in-shoe pressure measurement systems. The insoles examined were the Pedar Y-sized right insole and the F-scan insole trimmed to the size and shape of a Pedar Y-sized insole. Data were sampled at 50 Hz at different levels of applied pressure, calibration procedure, duration of pressure application, insole age of use and experiment day or week. The system accuracy was determined by the per cent error of measurement, the system precision by the 95% tolerance interval of the per cent error. The results show that system accuracy and precision varied among levels of applied pressure, calibration procedure, duration of pressure application and insole age of use. The Pedar system showed the greatest accuracy and precision when the insole was new and measurements were taken (1) after a system calibration as specified by the manufacturer, (2) in the 50-500 kPa pressure range and (3) within a few seconds after pressure was applied. Under this condition, the measurement error was in the range -0.6 to 2.7%, and the magnitude (upper bound minus lower bound) of the 95% tolerance intervals was from 13.5 to 18.7%. Measuring less than 35 kPa with the Pedar system is not recommended. To ensure the accuracy and precision of the F-Scan system, users are recommended to estimate the range of the applied pressure and then choose a similar pressure level for calibration. Under this condition, the measurement error was in the range 1.3-5.8% and the magnitude (upper bound minus lower bound) of the 95% tolerance intervals was estimated to be in the range 1.1-14.8%. When the calibration pressure was outside this range of applied pressure, the per cent errors were considerably higher, ranging from -26.3 to 33.9%.