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BioMed Research International
Volume 2017 (2017), Article ID 8208764, 8 pages
Research Article

Ultrasonic Measurement of Dynamic Muscle Behavior for Poststroke Hemiparetic Gait

1School of Biomedical Engineering, Shenzhen University, Shenzhen, China
2National-Regional Key Technology Engineering Laboratory for Medical Ultrasound, Shenzhen, China
3Guangdong Key Laboratory for Biomedical Measurements and Ultrasound Imaging, Shenzhen, China
4Shenzhen Sixth People’s Hospital, Shenzhen, China
5Shenzhen Hospital of Southern Medical University, Shenzhen, China

Correspondence should be addressed to Yongjin Zhou and Wan-Zhang Yang

Received 5 August 2016; Revised 10 November 2016; Accepted 21 December 2016; Published 23 January 2017

Academic Editor: Qing-Hua Huang

Copyright © 2017 Xin Chen et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Quantitative evaluation of the hemiparesis status for a poststroke patient is still challenging. This study aims to measure and investigate the dynamic muscle behavior in poststroke hemiparetic gait using ultrasonography. Twelve hemiparetic patients walked on a treadmill, and EMG, joint angle, and ultrasonography were simultaneously recorded for the gastrocnemius medialis muscle. Pennation angle was automatically extracted from ultrasonography using a tracking algorithm reported previously. The characteristics of EMG, joint angle, and pennation angle in gait cycle were calculated for both (affected and unaffected) sides of lower limbs. The results suggest that pennation angle could work as an important morphological index to continuous muscle contraction. The change pattern of pennation angle between the affected and unaffected sides is different from that of EMG. These findings indicate that morphological parameter extracted from ultrasonography can provide different information from that provided by EMG for hemiparetic gait.