抄録
In this paper, we propose the three-dimensional analysis method of arches deformation of the foot using geometric approximation. In previous studies, the longitudinal arch of the foot was analyzed by connecting the markers measured by optical motion capture with the straight lines. We analyzed arches deformation of the foot using the ellipse and ellipsoid approximation because the arch of foot is a curve. The change of each axial length of the ellipse and ellipsoid corresponds to the change of the arch length and the arch height before and after the load. Then we compared the analysis results with the previous knowledge.
