Analysis of Skin Deformation Differences on the Upper Arm Between Active and Passive Movements During Elbow Flexion and Extension
Analysis of Skin Deformation Differences on the Upper Arm Between Active and Passive Movements During Elbow Flexion and Extension
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DOI：
10.1109/embc46164.2021.9630800
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发表时间：
2021-11
期刊：
影响因子：
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通讯作者：
Sung-Gwi Cho;Mayuki Toyoda;Ming Ding;J. Takamatsu;C. Yokota;T. Ogasawara
中科院分区：
文献类型：
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作者：
Sung-Gwi Cho;Mayuki Toyoda;Ming Ding;J. Takamatsu;C. Yokota;T. Ogasawara
脑卒中急性期患者的运动能力难以用现有的Brunnstrom分期等指标来界定。因此，为了设计一种新的卒中急性期康复评价指标，我们重点关注主动和被动运动中皮肤变形的差异。皮肤变形反映了与运动能力有关的身体组织的活动。我们测量了肘关节屈伸时主动和被动运动时上臂的皮肤变形，并从这些变形中提取特征。对于实际康复应用，我们开发了一种新型的柔性距离传感器阵列，以减少将传感器连接到患者身上所需的时间。利用主成分分析（PCA）将皮肤变形分解为关节运动和运动活跃度作为前两个分量（PC1和PC2）。关节角与PC1呈高度相关，PC2的标准差（SD）提示不同运动类型间存在显著差异。综上所述，我们认为PC2和PC1之间的SD比值考虑到其固有的生物力学特性，可以用来评价运动能力。
The motion ability of patients in the acute phase of stroke is difficult to define with existing indexes such as the Brunnstrom stage. Hence, for designing a novel evaluation index for stroke rehabilitation in the acute phase, we focused on the differences between the skin deformations in active and passive movements. Skin deformation reflects the activities of body tissues that are related to motion ability. We measured skin deformations on the upper arm in active and passive movements during elbow flexion and extension and extracted features from these deformations. For practical rehabilitation applications, we developed a novel flexible distance sensor array to reduce the time needed for attaching sensors to patients. Using principal component analysis (PCA), the skin deformation could be decomposed into joint movements and activeness of movements as the first two components (PC1 and PC2). The joint angle and PC1 exhibited a high correlation, and the standard deviation (SD) of PC2 indicated a significant difference in the types of movements. From the above results, we concluded that the SD ratio between PC2 and PC1 may be used to evaluate motion ability considering the inherent biomechanical characteristics.