Differential strain patterns of the human gastrocnemius aponeurosis and free tendon, in vivo
Differential strain patterns of the human gastrocnemius aponeurosis and free tendon, in vivo
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DOI：
10.1046/j.1365-201x.2003.01048.x
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发表时间：
2003-02-01
期刊：
影响因子：
--
通讯作者：
Kjaer, M
中科院分区：
文献类型：
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作者：
Magnusson, SP;Hansen, P;Kjaer, M
目的：人体游离肌腱和腱膜的力学特性，在体内，在很大程度上仍然未知。本研究评价了纵向位移的单独的自由跟腱和远端（深）腱膜的内侧腓肠肌在自愿等长contraction.Methods：超声获得的位移的自由肌腱和肌腱腱膜复合体，肌电图的腓肠肌，比目鱼肌，背屈肌，关节角旋转等长跖屈（n = 5）。使用磁共振成像测量肌腱横截面积、力臂和节段长度（L-o）。通过关节力矩和钢筋束力臂计算钢筋束力，通过将力除以横截面积获得应力。游离肌腱和肌腱-腱膜复合体变形之间的差异产生单独的远端腱膜变形。纵向腱膜和肌腱应变是从变形归一化到节段长度获得的。在2641 +/- 306 N的常见肌腱力下，游离肌腱的变形和L-o分别为5.85 +/- 0.85和74 +/- 0.8 mm，远端腱膜的变形和L-o分别为2.12 +/- 0.64和145 +/- 1.3 mm，P < 0.05。肌腱的纵向应变为8.0 ± 1.2%，腱膜的纵向应变为1.4 ± 0.4%，P < 0.01。游离肌腱的刚度和储能分别为759 +/- 132 N mm（-1）和6.14 +/- 1.89 J。跟腱的横截面积为73 +/- 4 mm（2），产生的应力为36.5 +/- 4.6 MPa，杨氏模量为788 +/- 181 MPa。在随意等长收缩过程中，游离跟腱比远端（深）腱膜显示出更大的应变，这表明在体内力传递过程中可能存在单独的功能作用。
Aim: The mechanical characteristics of the human free tendon and aponeurosis, in vivo, remains largely unknown. The present study evaluated the longitudinal displacement of the separate free Achilles tendon and distal (deep) aponeurosis of the medial gastrocnemius muscle during voluntary isometric contraction.Methods: Ultrasonography-obtained displacement of the free tendon and tendon-aponeurosis complex, electromyography of the gastrocnemius, soleus, and dorsiflexor muscles, and joint angular rotation were recorded during isometric plantarflexion (n = 5). Tendon cross-sectional area, moment arm and segment lengths (L-o) were measured using magnetic resonance imaging. Tendon force was calculated from joint moments and tendon moment arm, and stress was obtained by dividing force by cross-sectional area. The difference between the free tendon and tendon-aponeurosis complex deformation yielded separate distal aponeurosis deformation. Longitudinal aponeurosis and tendon strain were obtained from the deformations normalized to segment lengths.Results: At a common tendon force of 2641 +/- 306 N, the respective deformation and L-o were 5.85 +/- 0.85 and 74 +/- 0.8 mm for the free tendon and 2.12 +/- 0.64 and 145 +/- 1.3 mm for the distal aponeurosis, P < 0.05. Longitudinal strain was 8.0 +/- 1.2% for the tendon and 1.4 +/- 0.4% for the aponeurosis, P < 0.01. Stiffness and stored energy was 759 +/- 132 N mm(-1) and 6.14 +/- 1.89 J, respectively, for the free tendon. Cross-sectional area of the Achilles tendon was 73 +/- 4 mm(2), yielding a stress of 36.5 +/- 4.6 MPa and Young's modulus of 788 +/- 181 MPa.Conclusion: The free Achilles tendon demonstrates greater strain compared with that of the distal (deep) aponeurosis during voluntary isometric contraction, which suggests that separate functional roles may exist during in vivo force transmission.