Validity of a Portable APDM Inertial Sensor System for Stride Time and Stride Length during Treadmill Walking

G. Tack, Jin-Seung Choi
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引用次数: 1

Abstract

Objective: The purpose of this study was to compare the accuracy of stride time and stride length provided by a commercial APDM inertial sensor system (APDM) with the results of three dimensional motion capture system (3D motion) during treadmill walking. Method: Five healthy men participated in this experiment. All subjects walked on the treadmill for 3 minutes at their preferred walking speed. The 3D motion and the APDM were simultaneously used for extracting gait variables such as stride time and stride length. Mean difference and root mean squared (RMS) difference were used to compare the measured gait variables from the two measurement devices. The regression equation derived from the range of motion of the lower limb was also applied to correct the error of stride length. Results: The stride time extracted from the APDM was almost the same as that from the 3D motion (the mean difference and RMS difference were less than 0.0001 sec and 0.0085 sec, respectively). For stride length, mean difference and RMS difference were less than 0.1141 m and 0.1254 m, respectively. However, after correction of the stride length error using the derived regression equation, the mean difference and the RMS difference decreased to 0.0134 m and 0.0556 m or less, respectively. Conclusion: In this study, we confirmed the possibility of using the temporal variables provided from the APDM during treadmill walking. By applying the regression equation derived only from the range of motion provided by the APDM, the error of the spatial variable could be reduced. Although further studies are needed with additional subjects and various walking speeds, these results may provide the basic data necessary for using APDM in treadmill walking.
便携式APDM惯性传感器系统在跑步机上行走时步幅和步幅的有效性
目的:比较商用APDM惯性传感器系统(APDM)与三维运动捕捉系统(3D motion)在跑步机上行走时步幅时间和步幅长度的准确性。方法:5名健康男性参与实验。所有受试者以自己喜欢的步行速度在跑步机上行走3分钟。同时利用三维运动和APDM提取步幅时间和步幅长度等步态变量。采用均差和均方根(RMS)差来比较两种测量装置测量的步态变量。利用下肢运动范围的回归方程对步幅误差进行了修正。结果:从APDM中提取的步幅时间与从3D运动中提取的步幅时间基本一致(平均差值小于0.0001秒,均方根差值小于0.0085秒)。步幅平均差值小于0.1141 m,均方根差值小于0.1254 m。然而,利用推导的回归方程对步长误差进行校正后,平均差和均方根差分别降至0.0134 m和0.0556 m以下。结论:在这项研究中,我们证实了在跑步机上行走时使用APDM提供的时间变量的可能性。通过应用仅由APDM提供的运动范围导出的回归方程,可以减小空间变量的误差。虽然需要更多的研究对象和不同的步行速度进行进一步的研究,但这些结果可能为在跑步机上使用APDM提供必要的基础数据。
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