Yoshitake Yasuhide, Takai Yohei, Kanehisa Hiroaki, Shinohara Minoru
Department of Sports and Life Sciences, National Institute of Fitness and Sports in Kanoya, Kanoya, Kagoshima, Japan.
Muscle Nerve. 2014 Jul;50(1):103-13. doi: 10.1002/mus.24104. Epub 2014 May 17.
In this study we examine the repeatability of measuring muscle shear modulus using ultrasound shear-wave elastography between trials and between days, and the association between shear modulus and contraction intensity over a wide range of intensities.
Shear modulus of the biceps brachii was determined using ultrasound shear-wave elastography during static elbow flexion (up to 60% of maximal contraction) in healthy young adults.
The correspondence of shear modulus was confirmed in phantoms between the manufacturer-calibrated values and the shear-wave elastography values. The intraclass correlation coefficient of muscle shear modulus was high: 0.978 between trials and 0.948 between days. Shear modulus increased linearly with elbow flexion torque across contraction intensity, and its slope was associated negatively with muscle strength.
Muscle shear modulus measured with ultrasound shear-wave elastography may be useful for inferring muscle stiffness across a wide range of contraction intensity. In addition, it has high repeatability between trials and between days.
在本研究中，我们检测了使用超声剪切波弹性成像在不同试验之间和不同日期之间测量肌肉剪切模量的可重复性，以及在广泛强度范围内剪切模量与收缩强度之间的关联。
在健康年轻成年人静态屈肘（高达最大收缩的60%）过程中，使用超声剪切波弹性成像测定肱二头肌的剪切模量。
在模型中，制造商校准值与剪切波弹性成像值之间的剪切模量对应性得到证实。肌肉剪切模量的组内相关系数很高：试验之间为0.978，不同日期之间为0.948。在整个收缩强度范围内，剪切模量随屈肘扭矩呈线性增加，其斜率与肌肉力量呈负相关。
用超声剪切波弹性成像测量的肌肉剪切模量可能有助于推断广泛收缩强度范围内的肌肉僵硬度。此外，它在不同试验之间和不同日期之间具有很高的可重复性。
