Institut de Recherche Robert-Sauvé en Santé et en Sécurité du Travail (IRSST), Montreal, QC, Canada; Departement of Kinesiology, Faculty of Medicine, Université Laval, Quebec City, QC, Canada.
Institut de Recherche Robert-Sauvé en Santé et en Sécurité du Travail (IRSST), Montreal, QC, Canada.
J Biomech. 2020 Jan 23;99:109520. doi: 10.1016/j.jbiomech.2019.109520. Epub 2019 Nov 18.
While some low-cost inertial motion capture (IMC) systems are now commercially available, generally, they have not been evaluated against gold standard optical motion capture (OMC). The objective was to validate the low-cost Neuron IMC system with OMC. Whole-body kinematics were recorded on five healthy subjects during manual handling of boxes for about 32 min while wearing 17 magnetic and inertial measurement units with Optotrak clusters serving as a reference. The kinematical model was calibrated anatomically for OMC and with poses for IMC. Local coordinate systems were aligned with angular velocities to dissociate differences due to technology or kinematical model. Descriptive statistics including the root mean square error (RMSE), coefficient of multiple correlation (CMC) and limits of agreement (LoA) were applied to the joint angle curves. The average technological error yielded 5.8° and 4.9° for RMSE, 0.87 and 0.96 for CMC and 0.4 ± 8.6° and -0.3 ± 6.0° for LoA about the frontal and transverse axes respectively, whereas the longitudinal axis yielded 10.5° for RMSE, 0.78 for CMC and 3.3 ± 13.1° for LoA. Differences due to technology and to the model contributed similarly to the total difference between IMC and OMC. For many joints and axes, RMSE stayed under 5°, CMC over 0.9 and LoA under 10°, especially for the transverse axis and lower limb. The Neuron low-cost IMC system showed potential for tracking complex human movements of long duration in a normal laboratory environment with a certain error level that may be suitable for many applications involving large IMC distribution.
虽然现在有一些低成本的惯性运动捕捉（IMC）系统可供商业使用，但通常情况下，它们尚未与光学运动捕捉（OMC）的黄金标准进行评估。本研究的目的是验证低成本的 Neuron IMC 系统与 OMC 的吻合程度。在大约 32 分钟的时间里，让五名健康受试者在手动搬运箱子的过程中穿戴 17 个带有惯性测量单元的磁性和惯性测量单元，同时使用 Optotrak 集群进行记录。首先对 OMC 进行解剖学标定，然后对 IMC 进行运动学标定。将局部坐标系与角速度对齐，以分离由于技术或运动学模型而产生的差异。对关节角度曲线应用描述性统计，包括均方根误差（RMSE）、多重相关系数（CMC）和一致性界限（LoA）。平均技术误差在额状面和横断面上分别为 5.8°和 4.9°的 RMSE、0.87 和 0.96 的 CMC 以及 0.4±8.6°和-0.3±6.0°的 LoA，而纵轴的 RMSE 为 10.5°、CMC 为 0.78°和 LoA 为 3.3±13.1°。技术和模型的差异对 IMC 和 OMC 之间的总差异贡献相当。对于许多关节和轴，RMSE 保持在 5°以下，CMC 超过 0.9，LoA 低于 10°，特别是在横断面上和下肢。Neuron 低成本的 IMC 系统在正常实验室环境中具有跟踪复杂的长时间人类运动的潜力，具有一定的误差水平，可能适用于涉及大量 IMC 分布的许多应用。
