Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/15336
Title: Sonomyographic responses during voluntary isometric ramp contraction of the human rectus femoris muscle
Authors: Chen, X
Zheng, YP 
Guo, JY
Zhu, Z
Chan, SC
Zhang, Z
Keywords: Contraction speed
Cross-sectional area
Electromyography
Isometric contraction
Mechanomyography
Sonomyography
Ultrasonography
Issue Date: 2012
Publisher: Springer
Source: European journal of applied physiology, 2012, v. 112, no. 7, p. 2603-2614 How to cite?
Journal: European journal of applied physiology 
Abstract: This paper aims to investigate the relationship between torque and muscle morphological change, which is derived from ultrasound image sequence and termed as sonomyography (SMG), during isometric ramp contraction of the rectus femoris (RF) muscle, and to further compare SMG with the electromyography (EMG) and mechanomyography (MMG), which represent the electrical and mechanical activities of the muscle. Nine subjects performed isometric ramp contraction of knee up to 90% of the maximal voluntary contraction (MVC) at speeds of 45, 22.5 and 15% MVC/s, and EMG, MMG and ultrasonography were simultaneously recorded from the RF muscle. Cross-sectional area, which was referred to as SMG, was automatically extracted from continuously captured ultrasound images using a newly developed image tracking algorithm. Polynomial regression analyses were applied to fit the EMG/MMG/SMG-to-torque relationships, and the regression coefficients of EMG, MMG, and SMG were compared. Moreover, the effect of contraction speed on SMG/EMG/MMG-to-torque relationships was tested by pair-wise comparisons of the mean relationship curves at different speeds for EMG, MMG and SMG. The results show that continuous SMG could provide important morphological parameters of continuous muscle contraction. Compared with EMG and MMG, SMG exhibits different changing patterns with the increase of torque during voluntary isometric ramp contraction, and it is less influenced by the contraction speed.
URI: http://hdl.handle.net/10397/15336
ISSN: 1439-6319
EISSN: 1439-6327
DOI: 10.1007/s00421-011-2227-2
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