Veltink Peter H, Liedtke Christian, Droog Ed, van der Kooij Herman
Institute for Biomedical Technology (BMTI), University of Twente, 7500 AE Enschede, The Netherlands.
IEEE Trans Neural Syst Rehabil Eng. 2005 Sep;13(3):423-7. doi: 10.1109/TNSRE.2005.847359.
The measurement of ground reaction forces is important in the biomechanical analysis of gait and other motor activities. Many applications require full ambulatory measurement of these forces, but this is not supported by current measurement systems. We propose the use of two six-degrees-of-freedom force and moment sensors under each shoe, which enables the ambulatory measurement of ground reaction forces and centers of pressure (CoP). The feasibility of this method is illustrated by experimental results in a healthy subject, using a force plate as a reference. The ground reaction forces and CoP recordings show good correspondence when they are evaluated for forces above 40 N and when it is simply assumed that the sensors are flat on the ground when they are loaded. The root mean square (rms) difference of the magnitude of the ground reaction force over 12 gait trials was 15 +/- 2 N, corresponding to 1.9 +/- 0.3% of the maximum ground reaction force magnitude. The rms difference of the horizontal component of the ground reaction force was 3 +/- 2 N, corresponding to 0.4 +/- 0.2% of the maximum ground reaction force magnitude and to 2 +/- 1% of the maximum of the horizontal component of the ground reaction force. The rms distance between both CoP recordings is 2.9 +/- 0.4 mm, corresponding to 1.1 +/- 0.2% of the length of the shoe, when the trajectories are optimally aligned.
地面反作用力的测量在步态和其他运动活动的生物力学分析中至关重要。许多应用需要对这些力进行全动态测量，但当前的测量系统无法提供支持。我们建议在每只鞋下方使用两个六自由度力和力矩传感器，这能够实现对地面反作用力和压力中心（CoP）的动态测量。通过在一名健康受试者身上的实验结果，并以测力台作为参考，说明了该方法的可行性。当对大于40 N的力进行评估时，以及简单假设传感器在加载时平放在地面上时，地面反作用力和CoP记录显示出良好的一致性。在12次步态试验中，地面反作用力大小的均方根（rms）差异为15±2 N，相当于最大地面反作用力大小的1.9±0.3%。地面反作用力水平分量的rms差异为3±2 N，相当于最大地面反作用力大小的0.4±0.2%以及地面反作用力水平分量最大值的2±1%。当轨迹最佳对齐时，两个CoP记录之间的rms距离为2.9±0.4 mm，相当于鞋长的1.1±0.2%。
