Validity of Measurement for Trailing Limb Angle and Propulsion Force during Gait Using a Magnetic Inertial Measurement Unit
Validity of Measurement for Trailing Limb Angle and Propulsion Force during Gait Using a Magnetic Inertial Measurement Unit
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DOI：
10.1155/2019/8123467
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发表时间：
2019-12-23
影响因子：
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通讯作者：
Yone, Kazunori
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文献类型：
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作者：
Miyazaki, Takasuke;Kawada, Masayuki;Yone, Kazunori
推进力和拖曳角是评价步态质量的重要指标。本研究探讨了TLA和推进力测量的有效性，在各种步态条件下使用磁惯性测量单元（IMU），测量的基础上，使用三维运动分析系统和力平台。18名健康男性（平均年龄25.2 +/- 3.2岁，身高1.70 +/- 0.06 m）以首选、慢速和快速的速度行走。将IMU固定在胸部、腰椎、右大腿和小腿上。IMU在全局坐标系中计算加速度和倾斜角。TLA由连接髋关节与踝关节的线和矢状面中后期站立时的实验室垂直轴组成，由IMU获得的大腿和小腿节段角度以及运动分析系统的坐标数据计算。通过安装在胸腰椎上的惯性测量单元测量的前向加速度计算的速度增量和站立后期地面反作用力（AGRF）前向分量的归一化冲量来估计推进力。通过多重相关系数（CMC）、组内相关系数（ICC）和测量误差的均方根（RMS）来检验IMU和运动分析系统测量的TLA的相似性。采用相关分析方法对AGRF的归一化冲量与IMU测量的速度增量之间的关系进行了检验。TLA的CMC为0.956 ~ 0.959。峰值TLAs之间的ICC为0.831-0.876（p
Propulsion force and trailing limb angle (TLA) are meaningful indicators for evaluating quality of gait. This study examined the validity of measurement for TLA and propulsion force during various gait conditions using magnetic inertial measurement units (IMU), based on measurements using a three-dimensional motion analysis system and a force platform. Eighteen healthy males (mean age 25.2 +/- 3.2 years, body height 1.70 +/- 0.06 m) walked with and without trunk fluctuation at preferred, slow, and fast velocities. IMU were fixed on the thorax, lumbar spine, and right thigh and shank. IMU calculated the acceleration and tilt angles in a global coordinate system. TLA, consisting of a line connecting the hip joint with the ankle joint, and the laboratory's vertical axis at late stance in the sagittal plane, was calculated from thigh and shank segment angles obtained by IMU, and coordinate data from the motion analysis system. Propulsion force was estimated by the increment of velocity calculated from anterior acceleration measured by IMU fixed on the thorax and lumbar spine, and normalized impulse of the anterior component of ground reaction force (AGRF) during late stance. Similarity of TLA measured by IMU and the motion analysis system was tested by the coefficient of multiple correlation (CMC), intraclass correlation coefficient (ICC), and root mean square (RMS) of measurement error. Relationships between normalized impulse of AGRF and increments of velocity, as measured by IMU, were tested using correlation analysis. CMC of TLA was 0.956-0.959. ICC between peak TLAs was 0.831-0.876 (p