Physical Education and Sports Science Academic Group, National Institute of Education, Nanyang Technological University, 1 Nanyang Walk, Singapore 637616.
Gait Posture. 2013 Jun;38(2):281-6. doi: 10.1016/j.gaitpost.2012.11.025. Epub 2012 Dec 21.
This study investigated the between-day reliability of footprint geometric and plantar loading measurements on children utilising the Emed(®) M pressure measurement device. Bilateral footprints (static and dynamic) and foot loading measurements using the two-step gait method were collected on 21 children two days apart (age = 9.9 ± 1.8 years; mass = 34.6 ± 8.9 kg; height = 1.38 ± 0.12 m). Static and dynamic footprint geometric (lengths, widths and angles) and dynamic loading (pressures, forces, contact areas and contact time) parameters were compared. Intraclass correlation coefficients of static geometric parameters were varied (0.19-0.96), while superior results were achieved with dynamic geometric (0.66-0.98) and loading variables (0.52-0.94), with the exception of left contact time (0.37). Standard error of measurement recorded small absolute disparity for all geometric (length = 0.1-0.3 cm; arch index = 0.00-0.01; subarch angle = 0.6-6.2°; left/right foot progression angle = 0.5°/0.7°) and loading (peak pressure = 2.3-16.2 kPa; maximum force = 0.3-3.0%; total contact area = 0.28-0.49 cm(2); % contact area = 0.1-0.6%; contact time = 32-79 ms) variables. Coefficient of variation displayed widest spread for static geometry (1.1-27.6%) followed by dynamic geometry (0.8-22.5%) and smallest spread for loading (1.3-16.8%) parameters. Limits of agreement (95%) were narrower in dynamic than static geometric parameters. Overall, the reliability of most dynamic geometric and loading parameters was good and excellent. Static electronic footprint measurements on children are not recommended due to their light body mass which results in incomplete footprints.
本研究利用 Emed(®) M 压力测量设备调查了儿童足迹几何形状和足底负荷测量的日间可靠性。在两天内（年龄=9.9±1.8 岁；体重=34.6±8.9kg；身高=1.38±0.12m），对 21 名儿童的双侧足迹（静态和动态）和使用两步步态法的足部负荷测量进行了采集。比较了静态和动态足迹几何（长度、宽度和角度）和动态负荷（压力、力、接触面积和接触时间）参数。静态几何参数的组内相关系数变化范围为 0.19-0.96，而动态几何（0.66-0.98）和负荷变量（0.52-0.94）的结果更好，除了左接触时间（0.37）外。所有几何（长度=0.1-0.3cm；足弓指数=0.00-0.01；副弓角=0.6-6.2°；左右足推进角=0.5°/0.7°）和负荷（峰值压力=2.3-16.2kPa；最大力=0.3-3.0%；总接触面积=0.28-0.49cm(2)；%接触面积=0.1-0.6%；接触时间=32-79ms）变量的测量误差记录显示出较小的绝对差异。变异系数显示静态几何（1.1-27.6%）的分布最广，其次是动态几何（0.8-22.5%），分布最小的是负荷（1.3-16.8%）参数。动态几何参数的容许区间（95%）比静态几何参数的更窄。总体而言，大多数动态几何和负荷参数的可靠性良好或优秀。由于儿童的体重较轻，导致足迹不完整，因此不建议对静态电子足迹进行测量。
