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Motion of the living body is caused by contraction movement of the muscle.In order to elucidate the mechanism of swallowing movement and aspiration through muscle contractile movement,it is necessary to identify the contraction movement of the muscles.In this study,we assume that the morphological contraction movement is a finite elastic deformation due to the anisotropic and inelastic strain,and formulate the problem as seeking the strain such that the finite elastic deformed shape becomes the observed shape.