Abstract #1643

Visualization of Hysteresis in Passive Time-Dependent Responses of Skeletal Muscle in vivo by Using DTI

Yasuharu Watanabe¹, Keisaku Kimura², Masahiro Umeda¹, Yuko Kawai¹, Tomokazu Murase³, Toshihiro Higuchi³, Chuzo Tanaka³, Shoji Naruse⁴

¹Medical Informatics, Meiji University of Integrative Medicine, Kyoto, Japan; ²Health Promoting and Preventive Medicine, Meiji University of Integrative Medicine, Kyoto, Japan; ³Neurosurgery, Meiji University of Integrative Medicine, Kyoto, Japan; ⁴Health Care and Checkup, Daini Okamoto General Hospital, Kyoto, Japan

A quasi-linear viscoelasticity model with a hysteresis in the material properties is used to study passive time-dependent responses of skeletal muscles in vivo. In this model, viscoelasticity in muscle may cause hysteresis. The purposes of this study were to analyze in detail the water movement in skeletal muscles during pushing stimulation and visualize tissue deformation of the hysteresis in vivo by using DTI. The results showed varying deformation regions between the pushing and decompressing phases. This study showed that the differences in deformation regions and the direction of water movement were the factors responsible for the hysteresis.