Changes in Muscle Architecture of Vastus Lateralis Muscle during Fatiguing Contractions

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  • SODA Naoki
    Physical Therapy major, Deparment of Rehabilitation, Heisei College of Health Sciences
  • ISHIDA Hiroyasu
    Physical Therapy major, Deparment of Rehabilitation, Heisei College of Health Sciences
  • IKEDO Yasuyo
    Physical Therapy major, Deparment of Rehabilitation, Heisei College of Health Sciences

Bibliographic Information

Other Title
  • 疲労課題における外側広筋の形態学的変化について　　─羽状角，筋厚，筋束長の経時的変化─
  • 疲労課題における外側広筋の形態学的変化について : 羽状角,筋厚,筋束長の経時的変化
  • ヒロウ カダイ ニ オケル ソトガワコウキン ノ ケイタイガクテキ ヘンカ ニ ツイテ : ウジョウカク,キンコウ,キン ソクチョウ ノ ケイジテキ ヘンカ
  • ─羽状角，筋厚，筋束長の経時的変化─

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Description

[Purpose] The purpose of this study was to examine whether vastus lateralis muscle (VL) fascicle length and pennation angle alter during and after sustained submaximal isometric knee extention. [Subjects and Methods] Twelve female subjects performed maximal voluntary knee extensions (MVC) on a Biodex. This task consisted of a sustained submaximal isometric fatiguing contraction (75% MVC) until failure to hold the defined moment. Ultrasound (US) was used to visualize the muscle belly of the VL. [Results] The fascicle length of the VL decreased from 92.9 mm at the beginning to 81.3 mm at the end of fatigue, and the pennation angle increased from12.1°to14.5°. The root mean square (RMS) of the EMG signal of the VL increased signicantly with fatigue. [Conclusion] The results demonstrated that the architectural change of muscles detected using US could potentially provide complementary information for EMG for the muscle fatigue assessment.

Journal

  • Rigakuryoho Kagaku

    Rigakuryoho Kagaku 26 (6), 781-784, 2011

    The Society of Physical Therapy Science

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