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http://dx.doi.org/10.13104/imri.2022.26.2.117

The Ability of Muscle Functional MRI to Detect the Slight Effect of Exercise on Trunk Muscle Activity  

Tawara, Noriyuki (Department of Radiological Sciences, Faculty of Health Sciences, Japan Healthcare University)
Publication Information
Investigative Magnetic Resonance Imaging / v.26, no.2, 2022 , pp. 117-124 More about this Journal
Abstract
Purpose: In this study, we provide a way to assess even a slight effect of exercise on trunk-muscle activity. Materials and Methods: Seven healthy male participants (mean age, 24.7 ± 3.2 years; height, 171.2 ± 9.8 cm; and weight, 63.8 ± 11.9 kg) performed 15 sets of an exercise with 20 repetitions of 90° hip and right-knee flexion while lying supine. The exercise intensity was measured using the 10-point Rating of Perceived Exertion Scale after the first and 15th sets of exercises. Although cross-sectional areas and functional T2 mapping using ultrafast imaging (fast-acquired muscle functional magnetic resonance imaging, fast-mfMRI) have been proposed for imaging to evaluate exercise-induced muscle activity in real time, no previous studies have reported on the evaluation of trunk-muscle activity using functional T2 mapping. As a method for assessing trunk-muscle activity, we compared functional T2 mapping using ultrafast imaging (fast-mfMRI) with cross-sectional areas. Results: Although the muscle cross-sectional areas were increased by the exercise, there was no significant difference at rest. On the other hand, for all sets, the changes in T2 were significant compared with those at rest (P < 0.01). These results demonstrate that T2, calculated from fast-mfMRI images can be used to detect even a small amount of muscle activity induced by acute exercise, which was impossible to do with cross-sectional areas. Conclusion: Fast-mfMRI, which can also display functional information with detailed forms, enabled non-invasive real-time imaging for identifying and evaluating the degree of deep trunk-muscle activity induced by exercise.
Keywords
Exercise; Muscle functional magnetic resonance imaging (mfMRI); Spin-echo echo-planar imaging (SE-EPI); True imaging with steady-state progression (True-FISP); Transverse relaxation time (T2);
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