Dynamic analysis of T 2 and proton density of exercise-induced muscle using SE-EPI

Understanding of exercised muscle activity has been the essences in sports medicine and rehabilitation medicine. Although MRI is a useful technique to obtain quantitative values of T ₂ and proton density, most of the previous MRI studies discussed changes of MR signal. Changes of T ₂ in the exercised muscle are speculated based on the results of the NIRS, and various physiologic mechanisms are proposed. However, physiologic understanding of exercised muscle activity is still controversial. In this study, we first tried to obtain dynamic changes of T ₂ and proton density quantitatively after the muscle exercise. In conclusion, using SE-EPI, temporal resolution of dynamic study of exercise-induced muscle can be shortened to 30 s and dynamic changes of R ₂ and M ₀ were quantitatively obtained for the new understanding of exercised muscle activity.

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