The contraction-induced increase in Achilles tendon moment arm: A three-dimensional study
The contraction-induced increase in Achilles tendon moment arm: A three-dimensional study
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DOI：
10.1016/j.jbiomech.2014.08.003
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发表时间：
2014-09-22
影响因子：
2.4
通讯作者：
Yanai, Toshimasa
中科院分区：
文献类型：
--
作者：
Hashizume, Satoru;Iwanuma, Soichiro;Yanai, Toshimasa
本研究旨在从三维角度重新探讨掌屈肌等长收缩对跟腱力矩臂(ATMA)的影响以及影响ATMA的因素。在静息状态下，分别在背屈10度、中立位和足底屈10度的足位，以及在30%的自愿力收缩状态下，记录右踝关节的一系列冠状磁共振图像，确定距小腿关节轴与距小腿关节轴正交面上的跟腱作用力作用线之间的最短距离。收缩状态下测得的ATMA比静息状态下测得的ATMA大8 mm。由于肌肉收缩，距小腿关节轴线前移3 mm，远端移位2 mm。同时，跟腱作用力的作用线向后移位5 mm，向内移位2 mm。距小腿关节轴和跟腱作用力的这些线性位移分别解释了两种情况下ATMA的差异35.9%和62.4%。这些角位移占ATMA总增长0.4%。这些结果证实了先前在二维研究中报道的结果，并发现跟腱作用力的线性位移是收缩诱导的ATIVIA增加的主要来源。(C)2014爱思唯尔有限公司。保留所有权利。
The present study aimed to re-examine the influence of the isometric plantarflexors contraction on the Achilles tendon moment arm (ATMA) and the factors influencing the ATMA in three-dimensions. A series of coronal magnetic resonance images of the right ankle were recorded at foot positions of 10 degrees of dorsiflexion, neutral position, and 10 degrees of plantarflexion for the rest condition and the plantarflexors contraction condition at 30% maximal voluntary effort The shortest distance between the talocrural joint axis and the line of action of the Achilles tendon force projected to the orthogonal plane of the talocrural joint axis was determined as the ATMA. The ATMA determined in the contraction condition was significantly greater by 8 mm than that determined in the rest condition. The talocrural joint axis was displaced anteriorly by 3 mm and distally by 2 mm due to the muscle contraction. As the same time, the line of action of the Achilles tendon force was displaced posteriorly by 5 mm and medially by 2 mm. These linear displacements of the talocrural joint axis and the line of action of the Achilles tendon force accounted for the difference in the ATMAs between the two conditions by 35.9 and 62.4%, respectively. These angular displacements accounted for the total of 0.4% increase in the ATMA. These results confirm the previous findings reported in two-dimensional studies and found that the linear displacement of the line of action of the Achilles tendon force is the primary source of the contraction-induced increase in the ATIVIA. (C) 2014 Elsevier Ltd. All rights reserved.