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首页> 美国卫生研究院文献>Sensors (Basel Switzerland) >Examination of Inertial Sensor-Based Estimation Methods of Lower Limb Joint Moments and Ground Reaction Force: Results for Squat and Sit-to-Stand Movements in the Sagittal Plane
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Examination of Inertial Sensor-Based Estimation Methods of Lower Limb Joint Moments and Ground Reaction Force: Results for Squat and Sit-to-Stand Movements in the Sagittal Plane

机译：基于惯性传感器的下肢关节力矩和地面反作用力估算方法的检验：矢状面下蹲和坐直运动的结果

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Joint moment estimation by a camera-based motion measurement system and a force plate has a limitation of measurement environment and is costly. The purpose of this paper is to evaluate quantitatively inertial sensor-based joint moment estimation methods with five-link, four-link and three-link rigid body models using different trunk segmented models. Joint moments, ground reaction forces (GRF) and center of pressure (CoP) were estimated for squat and sit-to-stand movements in the sagittal plane measured with six healthy subjects. The five-link model and the four-link model that the trunk was divided at the highest point of the iliac crest (four-link-IC model) were appropriate for joint moment estimation with inertial sensors, which showed average RMS values of about 0.1 Nm/kg for all lower limb joints and average correlation coefficients of about 0.98 for hip and knee joints and about 0.80 for ankle joint. Average root mean square (RMS) errors of horizontal and vertical GRFs and CoP were about 10 N, 15 N and 2 cm, respectively. Inertial sensor-based method was suggested to be an option for estimating joint moments of the trunk segments. Inertial sensors were also shown to be useful for the bottom-up estimation method using measured GRFs, in which average RMS values and average correlation coefficients were about 0.06 Nm/kg and larger than about 0.98 for all joints.
机译：由基于照相机的运动测量系统和测力板进行的联合力矩估计具有测量环境的局限性并且成本很高。本文的目的是使用不同的躯干分段模型，用五连杆，四连杆和三连杆刚体模型来评估基于惯性传感器的联合力矩估计方法。评估了六名健康受试者在矢状面中的下蹲和坐着站立运动的关节力矩，地面反作用力（GRF）和压力中心（CoP）。躯干在the的最高点处被分开的五连杆模型和四连杆模型（四连杆IC模型）适用于惯性传感器的联合力矩估算，其平均RMS值约为0.1所有下肢关节的Nm / kg，髋和膝关节的平均相关系数约为0.98，踝关节的平均相关系数约为0.80。水平和垂直GRF和CoP的平均均方根（RMS）误差分别约为10 N，15 N和2 cm。建议使用基于惯性传感器的方法来估计躯干节段的关节力矩。惯性传感器还显示出可用于使用测得的GRF进行的自下而上的估算方法，该方法的平均RMS值和平均相关系数约为0.06 Nm / kg，并且对于所有关节均大于约0.98。

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