Muscle shear modulus measured with ultrasound shear‐wave elastography across a wide range of contraction intensity |
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| Authors: | Hiroaki Kanehisa PhD Minoru Shinohara PhD |
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| Institution: | 1. Department of Sports and Life Sciences, National Institute of Fitness and Sports in Kanoya, , Kanoya, Kagoshima, Japan;2. School of Applied Physiology, Georgia Institute of Technology, , Atlanta, Georgia, 30332 USA;3. Rehabilitation R&D Center of Excellence, Atlanta VA Medical Center, , Decatur, Georgia, USA |
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| Abstract: | Introduction: 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. Methods: 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. Results: 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. Conclusions: 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. Muscle Nerve 50 : 103–113, 2014 |
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| Keywords: | biceps brachii elastography electromyography muscle tone muscle stiffness |
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