横观各向同性
等长运动
压缩性
弹性成像
刚度
弹性模量
剪切模量
弹性(物理)
同种类的
剪切(地质)
剪应力
各向同性
材料科学
解剖
物理
超声波
机械
复合材料
医学
声学
光学
热力学
物理疗法
作者
Jean-Pierre Remenieras,Mahé Bulot,Jean-Luc Gennisson,Fréd éric Patat,Michel Destrade,Guillaume Bacle
标识
DOI:10.1088/1361-6560/ac0f9b
摘要
Using shear wave elastography, we measure the changes in the wave speed with the stress produced by a striated muscle during isometric voluntary contraction. To isolate the behaviour of an individual muscle from complementary or antagonistic actions of adjacent muscles, we select theflexor digiti minimimuscle, whose sole function is to extend the little finger. To link the wave speed to the stiffness, we develop an acousto-elastic theory for shear waves in homogeneous, transversely isotropic, incompressible solids subject to an uniaxial stress. We then provide measurements of the apparent shear elastic modulus along, and transversely to, the fibre axis for six healthy human volunteers of different age and sex. The results display a great variety across the six subjects. We find that the slope of the apparent shear elastic modulus along the fibre direction changes inversely to the maximum voluntary contraction (MVC) produced by the volunteer. We propose an interpretation of our results by introducing the S (slow) or F (fast) nature of the fibres, which harden the muscle differently and accordingly, produce different MVCs. A natural follow-up on this study is to apply the method to patients with musculoskeletal disorders or neurodegenerative diseases.
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