Muscle Fatigue Properties of the Accessory Respiratory Muscles during Expiratory Load

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  • TSUKAMOTO Toshiya
    Department of Shizuoka Physical Therapy, Faculty of Health Sciences, Tokoha University Division of Physical Therapy, Department of Health Science, Graduate School of international University of Health and Welfare
  • UCHIDA Masaki
    Department of Shizuoka Physical Therapy, Faculty of Health Sciences, Tokoha University
  • MIURA Nodoka
    Department of Physical Therapy, School of Health Science, School at Odawara, International University of Health and Welfare
  • MARUYAMA Hitoshi
    Department of Physical Therapy, School of Health Science, International University of Health and Welfare

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Other Title
  • 呼気抵抗負荷における呼吸補助筋の筋疲労特性
  • コキ テイコウ フカ ニ オケル コキュウ ホジョキン ノ キン ヒロウ トクセイ

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Abstract

[Purpose] To investigate accessory respiratory muscle fatigue caused by expiratory load and its effects on accessory respiratory muscles during expiratory load. [Subjects] Eleven healthy adult males. [Methods] Maximum mouth pressures (PEmax, PImax) were measured during expiratory load and rest, and the trapezius, sternocleidomastoid, pectoralis major, rectus abdominis, and internal and external oblique abdominal muscle activities were assessed using electromyographic frequency analysis. [Results] The ratio of high to low frequency components of accessory respiratory muscle activity decreased by ≥20% in all muscles over 8 min. Furthermore, the time taken to reach the minimum PEmax was significantly greater for the external oblique than for the rectus abdominis, and the time taken to reach the minimum PImax was significantly longer for the sternocleidomastoid than for the external oblique. [Conclusions] The times taken to reach accessory respiratory muscle fatigue showed no differences, suggesting that expiration and inspiration barely fatigue the external oblique and sternocleidomastoid muscles, respectively. <br>

Journal

  • Rigakuryoho Kagaku

    Rigakuryoho Kagaku 31 (1), 143-150, 2016

    The Society of Physical Therapy Science

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