Helical sub-structures in energy-storing tendons provide a possible mechanism for efficient energy storage and return
Helical sub-structures in energy-storing tendons provide a possible mechanism for efficient energy storage and return
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DOI：
10.1016/j.actbio.2013.05.004
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发表时间：
2013-08-01
影响因子：
9.7
通讯作者：
Screen, Hazel R. C.
中科院分区：
文献类型：
--
作者：
Thorpe, Chavaunne T.;Klemt, Christian;Screen, Hazel R. C.
肌腱的主要功能是在运动过程中定位肢体。特定的肌腱也可以作为能量储存。能量储存（ES）肌腱容易受伤，其发生率随着年龄的增长而增加。这可能与其功能有关; ES肌腱暴露于更高的应变，需要比定位肌腱更大的回缩能力。ES肌腱的特殊性能被认为是通过结构和成分差异实现的。然而，对肌腱的结构-功能关系知之甚少。本研究使用来自马的浅指屈肌（SDFT）和总指伸肌（CDET）的肌束作为ES和位置肌腱的示例。我们假设，在微观水平上的伸展和回缩行为在肌腱类型之间会有所不同，并且在易受伤的SDFT中会随着年龄的增长而改变。支持这一点，结果表明，在CDET的扩展是由纤维滑动为主。相比之下，更大的旋转观察到的SDFT，这表明在这个肌腱束的螺旋组件。这是伴随着更大的恢复和更少的滞后损失SDFT样品。在老化的SDFT样品中，旋转量和恢复能力下降，而滞后损失增加。这些研究结果表明，在ES SDFT的束可能有一个螺旋结构，使更有效的反冲观察。此外，螺旋结构似乎随着年龄的增长而改变;这与SDFT束回缩能力的降低相一致。这可能会影响肌腱的抗疲劳性，并使老化的肌腱容易受伤。(C)2013 Acts Materialia Inc.由爱思唯尔有限公司出版。保留所有权利。
The predominant function of tendons is to position the limb during locomotion. Specific tendons also act as energy stores. Energy-storing (ES) tendons are prone to injury, the incidence of which increases with age. This is likely related to their function; ES tendons are exposed to higher strains and require a greater ability to recoil than positional tendons. The specialized properties of ES tendons are thought to be achieved through structural and compositional differences. However, little is known about structure-function relationships in tendons. This study uses fascicles from the equine superficial digital flexor (SDFT) and common digital extensor (CDET) as examples of ES and positional tendons. We hypothesized that extension and recoil behaviour at the micro-level would differ between tendon types, and would alter with age in the injury-prone SDFT. Supporting this, the results show that extension in the CDET is dominated by fibre sliding. By contrast, greater rotation was observed in the SDFT, suggesting a helical component to fascicles in this tendon. This was accompanied by greater recovery and less hysteresis loss in SDFT samples. In samples from aged SDFTs, the amount of rotation and the ability to recover decreased, while hysteresis loss increased. These findings indicate that fascicles in the ES SDFT may have a helical structure, enabling the more efficient recoil observed. Further, the helix structure appears to alter with ageing; this coincides with a reduction in the ability of SDFT fascicles to recoil. This may affect tendon fatigue resistance and predispose aged tendons to injury. (C) 2013 Acts Materialia Inc. Published by Elsevier Ltd. All rights reserved.