The time course of the effects of therapeutic ultrasound in different frequencies on the shear elastic modulus of the upper trapezius muscle

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  • Nakamura Masatoshi
    Institute for Human Movement and Medical Sciences, Niigata University of Health and Welfare Department of Physical Therapy, Faculty of Rehabilitation, Niigata University of Health and Welfare
  • Yang Ling
    Institute for Human Movement and Medical Sciences, Niigata University of Health and Welfare
  • Kiyono Ryosuke
    Institute for Human Movement and Medical Sciences, Niigata University of Health and Welfare Department of Physical Therapy, Faculty of Rehabilitation, Niigata University of Health and Welfare
  • Sato Shigeru
    Institute for Human Movement and Medical Sciences, Niigata University of Health and Welfare Department of Physical Therapy, Faculty of Rehabilitation, Niigata University of Health and Welfare
  • Morishita Katsuyuki
    Department of Physical Therapy, Faculty of Social Work Studies, Josai International University

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Other Title
  • 1 MHzと3 MHzの連続モード超音波が健常者の僧帽筋上部線維の弾性率に及ぼす影響
  • 1 MHzと3 MHzの連続モード超音波が健常者の僧帽筋上部線維の弾性率に及ぼす影響 : エラストグラフィー機能を用いた検討
  • 1   MHz ト 3   MHz ノ レンゾク モード チョウオンパ ガ ケンジョウシャ ノ ソウボウキン ジョウブ センイ ノ ダンセイリツ ニ オヨボス エイキョウ : エラストグラフィー キノウ オ モチイタ ケントウ
  • ─エラストグラフィー機能を用いた検討─

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Abstract

<p>To investigate the time course of the effects of therapeutic ultrasound in different frequencies (3 MHz and 1 MHz) on the shear elastic modulus of the upper trapezius muscle. A total of 20 healthy young men volunteered to participate in this study. The shear modulus of the upper trapezius muscle in the dominant arms was measured as an index of muscle stiffness using ultrasound shear-wave elastography with a frequency of 1 MHz or 3 MHz, duty cycle of 100%, and intensity of 2.0 W/cm2 for 10 min. The shear modulus measurements were obtained before and every 2 min after the therapeutic ultrasound intervention. The shear modulus obtained 4 min after was significantly lower than that taken before the therapeutic ultrasound. However, no significant differences were observed between 1 MHz and 3 MHz frequency of therapeutic ultrasound. Therapeutic ultrasound for more than 4 min effectively decreased the shear modulus of the upper trapezius muscle, regardless of frequency.</p>

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