Department of Bioengineering, University of Pittsburgh, Pittsburgh, PA 15213, USA.
Department of Medicine, University of Pittsburgh, Pittsburgh, PA 15213, USA.
Sensors (Basel). 2024 Feb 16;24(4):1232. doi: 10.3390/s24041232.
Adults with obesity experience high rates of disability and rapid functional decline. Identifying movement dysfunction early can direct intervention and disrupt disability development; however, subtle changes in movement are difficult to detect with the naked eye. This study evaluated how a portable, inertial measurement unit (IMU)-based motion capture system compares to a laboratory-based optokinetic motion capture (OMC) system for evaluating gait kinematics in adults with obesity. Ten adults with obesity performed overground walking while equipped with the OMC and IMU systems. Fifteen gait cycles for each participant were extracted for the 150 total cycles analyzed. Kinematics were compared between OMC and IMU across the gait cycles (coefficient of multiple correlations), at clinically significant time points (interclass correlations), and over clinically relevant ranges (Bland-Altman plots). Sagittal plane kinematics were most similar between systems, especially at the knee. Sagittal plane joint angles at clinically meaningful timepoints were poorly associated except for ankle dorsiflexion at heel strike (ρ = 0.38) and minimum angle (ρ = 0.83). All motions except for ankle dorsiflexion and hip abduction had >5° difference between systems across the range of angles measured. While IMU-based motion capture shows promise for detecting subtle gait changes in adults with obesity, more work is needed before this method can replace traditional OMC. Future work should explore standardization procedures to improve consistency of IMU motion capture performance.
肥胖成年人的残疾率和功能衰退速度都很高。早期发现运动功能障碍可以指导干预措施的实施，并阻止残疾的发展；然而，运动中的细微变化很难用肉眼察觉。本研究评估了一种便携式惯性测量单元 (IMU) 运动捕捉系统与基于视动运动捕捉 (OMC) 的实验室系统相比，在评估肥胖成年人步态运动学方面的表现。10 名肥胖成年人配备 OMC 和 IMU 系统进行地面行走。对每个参与者的 15 个步态周期进行了分析，共分析了 150 个周期。在步态周期（多系数相关性）、临床显著时间点（组内相关性）和临床相关范围内（Bland-Altman 图）对 OMC 和 IMU 之间的运动学进行了比较。矢状面运动学在两个系统之间最为相似，尤其是在膝关节。除了跟骨跖屈时的踝关节背屈（ρ=0.38）和最小角度（ρ=0.83）外，临床有意义时间点的矢状面关节角度相关性较差。除了踝关节背屈和髋关节外展外，所有运动在测量的角度范围内都有超过 5°的系统差异。虽然基于 IMU 的运动捕捉在检测肥胖成年人的微妙步态变化方面显示出了一定的潜力，但在这种方法可以替代传统的 OMC 之前，还需要做更多的工作。未来的研究应该探索标准化程序，以提高 IMU 运动捕捉性能的一致性。
