期刊
MEDICAL ENGINEERING & PHYSICS
卷 37, 期 7, 页码 712-716出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.medengphy.2015.04.004
关键词
Ultrasound speckle tracking; Non-uniform motion
资金
- NIH [F31AG043216, R01AR056201]
- American Society of Biomechanics
- International Society of Biomechanics Matching Dissertation Program
The purpose of this study was to investigate middle-age effects on Achilles displacement patterns under passive stretch and eccentric loading. Healthy young (24.1 +/- 1.4 years, n = 9) and middle-aged (49.0 +/- 3.1 years, n = 9) adults were positioned prone and the ankle was cyclically dorsiflexed (0.5 Hz, 25 degrees range) during passive stretch and active lengthening. Achilles displacements were tracked in cine ultrasound using 20 speckle tracking. Displacements were found to be non-uniform, with mid and deep portions of the tendon displacing more than superficial portions. However, the degree of non-uniformity was significantly reduced in middle-aged adults, suggesting a potential age-related reduction in inter-fascicle sliding or a shift in loading sharing between plantarflexors. Eccentric loading reduced displacement magnitudes, likely reflecting distal tendon stretch induced via active muscle contractions. Changes in tendon displacement with active loading were greater in middle-aged adults, which could reflect greater tendon compliance. The observed age-related changes in Achilles tendon behavior may have implications for both plantarflexor performance and injury risk. (C) 2015 IPEM. Published by Elsevier Ltd. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据