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Title: An investigation of the immediate effect of static stretching on the morphology and stiffness of achilles tendon in dominant and non-dominant legs
Authors: Chiu, TCR 
Ngo, HC 
Lau, LW 
Leung, KW 
Lo, MH 
Yu, HF 
Ying, M 
Issue Date: 2016
Publisher: Public Library of Science
Source: PLoS one, 2016, v. 11, no. 4, e0154443 How to cite?
Journal: PLoS one 
Abstract: Aims: This study was undertaken to investigate the immediate effect of static stretching on normal Achilles tendon morphology and stiffness, and the different effect on dominant and non-dominant legs; and to evaluate inter-operator and intra-operator reliability of using shear-wave elastography in measuring Achilles tendon stiffness.
Methods: 20 healthy subjects (13 males, 7 females) were included in the study. Thickness, cross-sectional area and stiffness of Achilles tendons in both legs were measured before and after 5-min static stretching using grey-scale ultrasound and shear-wave elastography. Inter-operator and intra-operator reliability of tendon stiffness measurements of six operators were evaluated.
Results: Result showed that there was no significant change in the thickness and cross-sectional area of Achilles tendon after static stretching in both dominant and non-dominant legs (p > 0.05). Tendon stiffness showed a significant increase in non-dominant leg (p < 0.05) but not in dominant leg (p > 0.05). The inter-operator reliability of shear-wave elastography measurements was 0.749 and the intra-operator reliability ranged from 0.751 to 0.941.
Conclusion: Shear-wave elastography is a useful and non-invasive imaging tool to assess the immediate stiffness change of Achilles tendon in response to static stretching with high intra-operator and inter-operator reliability.
EISSN: 1932-6203
DOI: 10.1371/journal.pone.0154443
Rights: © 2016 Chiu et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
The following publication: Chiu T-cR, Ngo H-c, Lau L-w, Leung K-w, Lo M-h, Yu H-f, et al. (2016) An Investigation of the Immediate Effect of Static Stretching on the Morphology and Stiffness of Achilles Tendon in Dominant and Non-Dominant Legs. PLoS ONE 11(4): e0154443 is available at
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