散步时质量中心加速:IMU和基于相机的运动捕捉方法之间的比较
Jasmine Y Liang1, Li-Shan Chou1
1Department of Kinesiology, Iowa State University, Ames, IA, USA.
Wearable technologies
|January 15, 2025
概括
在L5脊椎处的一个惯性测量单位 (IMU) 在行走过程中近似测量全身质量中心 (CoM) 运动. 然而,这项研究发现了加速的显著差异,这表明精确的人类运动分析的局限性.
科学领域:
- 生物力学 生物力学
- 人类运动分析 人类运动分析
- 可穿戴式传感器技术
背景情况:
- 在第五个腰椎 (L5) 的惯性测量单位 (IMU) 通常用于估计行走时全身质量中心 (CoM) 运动.
- 这种方法假设IMU的固定位置,可能会忽视影响真实CoM的车身段对齐的动态变化.
- 准确的CoM估计对于理解步态动态和开发有效的康复和绩效监测工具至关重要.
研究的目的:
- 为了评估从基于标记器的运动捕捉获得的全身质量中心 (CoM) 加速和在第五个腰椎 (L5) 放置的惯性测量单元 (IMU) 测量的加速之间的一致性.
- 量化基于IMU的估计和基于行走时的标记计算之间的加速数据的差异.
- 为开发更准确的可穿戴传感器系统提供信息,用于人类运动分析.
主要方法:
- 16名参与者走路,而49个标记器在骨地标上捕获了全身运动.
- 从标记数据计算出全身 CoM 位置,并使用有限差异算法推导出加速.
- 放置在L5的IMU提供了并发加速数据;布兰德-阿尔特曼和统计参数映射分析了IMU,标记衍生L5 (ML5) 和全身CoM加速之间的协议.
主要成果:
- 在IMU和全身CoM加速之间发现了适度的相关性 (r=0.58).
- 在IMU和ML5加速之间,以及在CoM和ML5加速之间存在强烈的相关性 (r=0.76).
- 在CoM和IMU之间,以及在CoM和ML5之间,在加速度大小中观察到显著的差异,特别是在特定步行阶段的前后和中侧方向.
结论:
- 在L5的IMU提供了一种适度的近似的全身CoM加速在行走过程中.
- 存在差异,特别是在前后和中侧平面,突出显示了固定IMU方法的局限性.
- 需要进一步研究改进可穿戴传感器算法,以提高基于IMU数据的人类运动分析的准确性.
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