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Dynamic assessment of center of pressure measurements from an instrumented AMTI treadmill with controlled precision

机译：用受控精度仪表式AMTI跑步机的压力测量中心动态评估

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With the increasing use of instrumented force treadmills in biomechanical research, it is imperative that the validity of center of pressure (COP) measurements is established. The study aims were to compare an instrumented treadmill's static-belt COP accuracy to that of a floor-embedded platform, develop a novel method to quantify dynamic-belt COP accuracy with controlled precision and perform an initial investigation of how dynamic COP accuracy changes with weight and velocity. Static COP accuracy was assessed by applying a force while moving a rigid rod in a circular clockwise motion at nine positions of interest on the two treadmill and two ground-embedded force plates. Dynamic COP accuracy was assessed for weights (68.0, 102.1, and 136.1 kg), applied through a ball bearing of 2.54 cm circumference, with peak treadmill belt speeds of 0.5, 0.75, and 1.0 m/s. COP accuracy was assessed relative to motion capture marker trajectories. Statically, treadmill COP error was similar to that of the ground-embedded force plates and that reported for other treadmills. Dynamically, COP error appeared to vary systematically with weight and velocity and in the case of anteroposterior COP error, shear force, although testing with a larger number of weights and velocities is needed to fully define the relationship. This novel method can be used to assess any instrumented treadmill's dynamic COP accuracy with controlled precision. (C) 2017 IPEM. Published by Elsevier Ltd. All rights reserved.
机译：随着仪表力跑步机在生物力学研究中越来越多，建立了压力中心（COP）测量的有效性。该研究的目标是将仪表架的静态带Cop准确性与落地平台进行比较，开发一种用控制精度量化动态带支主高精度的新方法，并对动态Cop精度随体重变化的初步调查和速度。通过在两个跑步机和两个地下嵌入力板上的九个位置处的圆形顺时针运动中移动刚性杆的同时施加力来评估静态支撑精度。使用2.54cm周长的滚珠轴承施加的重量（68.0,102.1和136.1kg）评估动态支撑精度，峰值跑步机带速度为0.5,0.75和1.0m / s。相对于运动捕获标记轨迹评估COP准确度。静态地，跑步机COP错误类似于地面嵌入式力板的误差，并为其他跑步机报告。动态地，COP错误似乎系统地随着重量和速度而系统地变化，并且在前后警察误差，剪切力时，虽然需要具有更大的权重和速度的测试来完全定义关系。这种新方法可用于评估任何仪表速架的动态支付高精度，具有受控精度。 （c）2017年IPEM。 elsevier有限公司出版。保留所有权利。

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