ESTIMATION OF MUSCLE FIBER COMPOSITION USING MAGNETIC RESONANCE IMAGING (MRI)

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  • KUNO SHIN-YA
    <I>Department of Radiology, Institute of Clinical Medicine, The University of Tsukuba</I>
  • KATSUTA SHIGERU
    <I>Institute of Health and Sports Science, The University of Tsukuba</I>
  • AKISADA MASAYOSHI
    <I>Department of Radiology, Institute of Clinical Medicine, The University of Tsukuba</I>
  • ANNO IZUMI
    <I>Department of Radiology, Institute of Clinical Medicine, The University of Tsukuba</I>
  • MATSUMOTO KUNIHIKO
    <I>Department of Radiology, Institute of Clinical Medicine, The University of Tsukuba</I>

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Other Title
  • 磁気共鳴映像法 (MRI) による筋線維組成の推定
  • ジキ キョウメイ エイゾウホウ MRI ニ ヨル キン センイ ソセイ ノ ス

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The relationship between relaxation time and muscle fiber composition was investigated in 16 males.<BR>A highly positive correlation was found between muscle fiber composition and relaxation time. In addition, higher proportions of fast-twitch fibers were associated with longer relaxation times, indicating that the fast-twitch fiber has a longer relaxation time than the slow-twitch fiber.<BR>Multiple regression analysis, which was conducted to investigate the suitability of relaxation time as a model for estimating muscle fiber composition, revealed that the T 1 and T 2 were significantly related to muscle fiber composition.<BR>Therefore, the results of the present study indicate that relaxation time obtained by MRI can be used to estimate muscle fiber composition.

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