title: Changes in T2-weighted MRI of supinator muscle, pronator teres muscle, and extensor indicis muscle with manual muscle testing.
abstract: [Purpose] In order to detect muscle activity with manual muscle testing, T2-weighted magnetic resonance (T2w-MR) images were detected by a 0.2 T compact MRI system. [Subjects and Methods] The subjects were 3 adult males. Transverse T2-weighted multi-slice spin-echo images of the left forearm were measured by a 39 ms echo-time with a 2,000 ms repetition time, a 9.5 mm slice thickness, 1 accumulation and a total image acquisition time of 4 min 16 s. First, T2w-MR images in the resting condition were measured. Then, manipulative isometric contraction exercise (5 sec duration) to the supinator muscle, the pronator teres muscle or the extensor indicis muscle was performed using Borg's rating of perceived exertion (RPE) scale of 15-17. The T2w-MR images were measured immediately after the exercise. [Results] T2w-MR image intensities increased significantly in the supinator muscle, the pronator teres muscle and the extensor indicis muscle after the exercise. However, the image intensities in the rest of the muscle did not change. [Conclusion] Using T2w-MR images, we could detect muscle activity in a deep muscle, the supinator muscle, and a small muscle, the extensor indicis muscle. These results also support the reliability of the manual muscle testing method.
authors.affiliation: Department of Regulatory Physiology, Dokkyo Medical University School of Medicine, Japan; Department of Rehabilitation, Faculty of Health Sciences, University of Human Arts and Sciences, Japan.
authors.forename: Kazuya
authors.initials: K
authors.lastname: Yoshida
authors.affiliation: Department of Regulatory Physiology, Dokkyo Medical University School of Medicine, Japan; Department of Rehabilitation, Faculty of Health Sciences, University of Human Arts and Sciences, Japan.
authors.forename: Sumikazu
authors.initials: S
authors.lastname: Akiyama
authors.affiliation: Department of Regulatory Physiology, Dokkyo Medical University School of Medicine, Japan; Department of Physical Therapy, Aoi Medical Academy, Japan.
authors.forename: Masayoshi
authors.initials: M
authors.lastname: Takamori
authors.affiliation: Department of Rehabilitation, Faculty of Health Sciences, University of Human Arts and Sciences, Japan.
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Otsuka D Eng
authors.affiliation: Department of Regulatory Physiology, Dokkyo Medical University School of Medicine, Japan.
authors.forename: Yoshiteru
authors.initials: Y
authors.lastname: Seo
keywords: Magnetic resonance imaging; Manual muscle test; Transverse relaxation time