In vivo human tendon mechanical properties
In vivo human tendon mechanical properties
复制标题
DOI：
10.1111/j.1469-7793.1999.00307.x
复制
发表时间：
1999-11-15
影响因子：
5.5
通讯作者：
Paul, JP
中科院分区：
文献类型：
--
作者：
Maganaris, CN;Paul, JP
1.本研究的目的是测量在体人胫骨前肌腱（TA）的力学性能.在5名男性中，在中性踝关节位置进行测量，包括：（a）增加经皮电刺激TA肌肉的电压后的等长测力法，（B）实时超声检查，用于测量收缩期间TA肌腱起点位移和肌腱横截面积，以及（c）磁共振成像，用于估计TA肌腱长度和力臂。根据测得的关节力矩和估计的力臂，计算出钢筋束力的值，并除以横截面积以获得应力值。将TA肌腱起点从静止到所有收缩强度的位移归一化为肌腱长度，以获得应变值。根据所得数据，确定了预应力筋的力-位移和应力-应变关系，并计算了预应力筋的刚度和杨氏模量.肌腱力和应力分别随位移和应变呈曲线增加。最大等长载荷下的肌腱力和位移分别为530 N和4.1 mm，相应的应力和应变值分别为25 MPa和2.5%。在最大等长载荷下，肌腱刚度和杨氏模量分别为161 N mm（-1）和1.2 GPa。这些结果是在协议与以前的报告在体外测试的孤立肌腱，并建议在生理负荷下的TA肌腱内的弹性“脚趾”区域。
1. The aim of the present study was to measure the mechanical properties of human tibialis anterior (TA) tendon in vivo.2. Measurements were taken in five males at the neutral ankle position and involved: (a) isometric dynamometry upon increasing the voltage of percutaneous electrical stimulation of the TA muscle, (b) real-time ultrasonography for measurements of the TA tendon origin displacement during contraction and tendon cross-sectional area, and (c) magnetic resonance imaging for estimation of the TA tendon length and moment arm.3. From the measured joint moments and estimated moment arms, the values of tendon force were calculated and divided by cross-sectional area to obtain stress values. The displacements of the TA tendon origin from rest to all contraction intensities were normalized to tendon length to obtain strain values. From the data obtained, the tendon force-displacement and stress-strain relationships were determined and the tendon stiffness and Young's modulus were calculated.4. Tendon force and stress increased curvilinearly as a function of displacement and strain, respectively. The tendon force and displacement at maximum isometric load were 530 N and 4.1 mm, and the corresponding stress and strain values were 25 MPa and 2.5%, respectively. The tendon stiffness and Young's modulus at maximum isometric load were 161 N mm(-1) and 1.2 GPa, respectively. These results are in agreement with previous reports on in vitro testing of isolated tendons and suggest that under physiological loading the TA tendon operates within the elastic 'toe' region.