Longitudinal and transverse deformation of human Achilles tendon induced by isometric plantar flexion at different intensities
Longitudinal and transverse deformation of human Achilles tendon induced by isometric plantar flexion at different intensities
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DOI：
10.1152/japplphysiol.00776.2010
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发表时间：
2011-06-01
影响因子：
3.3
通讯作者：
Kawakami, Yasuo
中科院分区：
文献类型：
--
作者：
Iwanuma, Soichiro;Akagi, Ryota;Kawakami, Yasuo
本研究确定在体内变形的整个跟腱在纵向和横向等长跖屈。12名年轻女性和男性在0%（休息），30%和60%的最大随意收缩（MVC）进行等长跖屈，同时拍摄一系列跟腱的斜向纵向和横截面磁共振（MR）图像。在比目鱼肌腹的远端，跟腱分为腱膜（ATapo）和腱（ATten）组件。在MR图像中测量每个组件的长度。在沿沿着ATapo的10个区域和沿沿着ATten的4个区域测定跟腱的宽度。纵向和横向应变计算为相对长度和宽度的变化与那些在休息。ATapo在30%MVC和60%MVC下在纵向和横向上都变形。在30%MVC和60%MVC下，ATapo在纵向（1.1和1.6%）或横向（5.0类似于11.4和5.0类似于13.9%）方向上的应变之间没有差异。ATten纵向伸长（3.3%）大于ATapo，而在最远端区域横向变窄（-4.6%）。目前的研究结果表明，跟腱近端和远端组件的收缩引起的变形的大小和方向是不同的。这可能与跟腱的不同功能有关，即，在肌肉收缩期间的力传递或弹性能量储存。
The present study determined in vivo deformation of the entire Achilles tendon in the longitudinal and transverse directions during isometric plantar flexions. Twelve young women and men performed isometric plantar flexions at 0% (rest), 30%, and 60% of the maximal voluntary contraction (MVC) while a series of oblique longitudinal and cross-sectional magnetic resonance (MR) images of the Achilles tendon were taken. At the distal end of the soleus muscle belly, the Achilles tendon was divided into the aponeurotic (ATapo) and the tendinous (ATten) components. The length of each component was measured in the MR images. The widths of the Achilles tendon were determined at 10 regions along ATapo and at four regions along ATten. Longitudinal and transverse strains were calculated as changes in relative length and width compared with those at rest. The ATapo deformed in both longitudinal and transverse directions at 30% MVC and 60% MVC. There was no difference between the strains of the ATapo at 30% MVC and 60% MVC either in the longitudinal (1.1 and 1.6%) or transverse (5.0 similar to 11.4 and 5.0 similar to 13.9%) direction. The ATten was elongated longitudinally (3.3%) to a greater amount than ATapo, while narrowing transversely in the most distal region (-4.6%). The current results show that the magnitude and the direction of contraction-induced deformation of Achilles tendon are different for the proximal and distal components. This may be related to the different functions of Achilles tendon, i.e., force transmission or elastic energy storage during muscle contractions.