Mechanical properties and collagen fiber orientation of tendon in young and elderly
Mechanical properties and collagen fiber orientation of tendon in young and elderly
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DOI：
10.1016/j.clinbiomech.2019.10.003
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发表时间：
2020-01-01
影响因子：
1.8
通讯作者：
Kubo, Keitaro
中科院分区：
文献类型：
--
作者：
Ishigaki, Tomonobu;Kubo, Keitaro
背景资料：本研究的目的是探讨青年组和老年组之间的肌腱结构的力学性能和胶原纤维取向的差异：在斜坡和弹道收缩过程中，腓肠肌内侧肌腱结构的力学性能，使用超声测量。跟腱胶原纤维方向估计从变异系数（CV）的回声对横向超声图像Achilles Tendon.Findings：老年人之间的斜坡和弹道收缩的伸长率差异显着小于年轻组的MVC的20-80%。在斜坡收缩时，老年人的滞后显著高于年轻人，而在弹道收缩时，两组的滞后没有差异。老年组斜坡收缩与弹道收缩的滞后差有小于青年组的趋势。老年人的平均回声显着高于年轻组，而没有差异的CV回声被发现在两个groups.Interpretation：这些结果表明，老年人的斜坡和弹道收缩之间的伸长率和滞后较小的差异可能与肌腱内的水含量减少。此外，两组肌腱的胶原纤维取向没有差异。
Background: The purpose of this study was to investigate differences in the mechanical properties and collagen fiber orientation of tendon structures between young and elderly groups.Methods: The mechanical properties of tendon structures in medial gastrocnemius muscle were measured using ultrasonography during ramp and ballistic contractions. Tendon collagen fiber orientation was estimated from coefficient of variation (CV) of echogenicity on transverse ultrasonic images of Achilles tendon.Findings: Differences in elongation between ramp and ballistic contractions of elderly were significantly smaller than those of young group at 20-80% of MVC. During ramp contraction, hysteresis of elderly was significantly higher than that of young, whereas no difference in hysteresis during ballistic contraction was found between the two groups. Difference in hysteresis between ramp and ballistic contractions of elderly tended to be lower than that of young group. Mean echogenicity of elderly was significantly higher than that of young group, whereas no difference in CV of echogenicity was found between the two groups.Interpretation: These results suggest that smaller differences in elongation and hysteresis between ramp and ballistic contractions of elderly may be related to decreased water content within tendons. Furthermore, no difference in collagen fiber orientation of tendons was noted between the two groups.