Site‐specific features of active muscle stiffness and proximal aponeurosis strain in biceps femoris long head
Site‐specific features of active muscle stiffness and proximal aponeurosis strain in biceps femoris long head
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股二头肌长头主动肌肉僵硬和近端腱膜应变的位点特异性
DOI：
10.1111/sms.13973
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发表时间：
2021
期刊：
影响因子：
--
通讯作者：
Hirata Kosuke
中科院分区：
文献类型：
--
作者：
Miyamoto Naokazu;Hirata Kosuke
关于收缩期间股二头肌长头肌(BFlh)肌肉僵硬和腱膜劳损的特定部位特征的信息有限。因此，对肌腱拉伤的机制和病因的理解仍然很困难。作为进一步了解它们的第一步，本研究旨在确定收缩过程中主动肌肉僵硬和近端腱膜应变是否沿BFlh的长轴变化。应用超声剪切波弹性成像技术，测量髋关节和膝关节分别屈曲40°和30°时膝关节屈曲最大自由等长收缩(MVC)20%、50%和80%时近端、中央和远端的BFlh肌肉剪切波速(僵硬指标)。此外，在等长屈膝过程中，使用B型超声对近端、中央和远端的BFlh近端腱膜的节段性应变进行了评估。在20%MVC值时，远端部位的剪切波速显著高于近端和中央部(p≤=0.002，影响幅度较大)，而在50%和80%MVC值时，三个部位之间的剪切波速度差异无统计学意义。在任何收缩强度下，BFlh近端腱膜应变在近端、中央和远端之间没有显著差异。这些发现表明，肌肉僵硬和近端腱膜应变在不同部位的差异实质上很小，在通常发生冲刺型腿筋劳损的部位，中到高收缩强度的BFlh的肌肉僵硬和近端腱膜应变并不例外。
Limited information is available on site‐specific features of muscle stiffness and aponeurosis strain of the biceps femoris long head (BFlh) during contractions. Therefore, understanding of the mechanics and etiology of hamstring strain injuries remains difficult. As a first step to gain further insight into them, the present study aimed to identify whether active muscle stiffness and proximal aponeurosis strain during contractions are varied along the long axis of the BFlh. The BFlh muscle shear wave speed (proxy for stiffness) was measured in the proximal, central, and distal sites during 20%, 50%, and 80% of maximal voluntary isometric contraction (MVC) of knee flexion exerted with the hip and knee joints flexed at 40° and 30°, respectively, using ultrasound shear wave elastography. Further, a segmental strain of the BFlh proximal aponeurosis was assessed in the proximal, central, and distal sites during isometric knee flexion, using B‐mode ultrasonography. The shear wave speed was significantly higher in the distal site than the proximal and central sites at 20% MVC (p≤ .002, with a large effect size), whereas no significant difference was found between the three sites at 50% and 80% MVC. The BFlh proximal aponeurosis strain showed no significant difference between the proximal, central, and distal sites at any contraction intensity. These findings indicate that site‐specific differences in muscle stiffness and proximal aponeurosis strain are substantially small and that muscle stiffness and proximal aponeurosis strain of the BFlh at moderate‐to‐high contraction intensity is not exceptional in the site where a sprinting‐type hamstring strain typically occurs.