Abstract #4059

Evaluation of viscoelastic changes of the psoas major muscle after exercise using MR elastography

Tetsushi Habe^1,2, Tomokazu Numano^1,3, Daiki Ito^1,2, Kouichi Takamoto⁴, and Hisao Nishijo⁵

¹Department of Radiological Sciences, Graduate School of Human Health Sciences, Tokyo Metropolitan University, Tokyo, Japan, ²Office of Radiation Technology, Keio University Hospital, Tokyo, Japan, ³Human Technology Research Insutitue, National Institute of Advanced Industrial Science and Techonology, Ibaraki, Japan, ⁴Department of Sport and Health Sciences, Faculty of Human Sciences, University of East Asia, Yamaguchi, Japan, ⁵System Emotional Science, Faculty of Medicine, University of Toyama, Toyama, Japan

Synopsis

Keywords: Muscle, Elastography

The shear modulus of the psoas major muscle (PM) after exercise has been evaluated using magnetic resonance elastography (MRE) previously, however, a separate evaluation of elasticity and viscosity has not been performed. We evaluate storage modulus representing elasticity and loss modulus representing viscosity of the PM using MRE after exercise in this study.

Comparing the before and immediately after exercise, the loss modulus showed a greater rate of decrease than the storage modulus, suggesting that the loss modulus, which reflects viscosity, is more useful for detecting changes of muscle tissue immediately after exercise.

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