Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/16199
Title: Detection of the electromechanical delay and its components during voluntary isometric contraction of the quadriceps femoris muscle
Authors: Begovic, H
Zhou, GQ
Li, T
Wang, Y
Zheng, YP 
Keywords: Contractile components
Electromechanical delay
Excitation-contraction coupling
Rectus femoris muscle
Series elastic components
Transient ultrasound
Issue Date: 2014
Publisher: Frontiers Research Foundation
Source: Frontiers in physiology, 2014, v. 5, no. DEC, 494 How to cite?
Journal: Frontiers in physiology 
Abstract: Electromechanical delay (EMD) was described as a time elapsed between first trigger and force output. Various results have been reported based on the measurement method with observed inconsistent results when the trigger is elicited by voluntary contraction. However, mechanomyographic (MMG) sensor placed far away on the skin from the contracting muscle was used to detect muscle fiber motion and excitation-contraction (EC) coupling which may give unreliable results. On this basis, the purpose of this study was to detect EMD during active muscle contraction whilst introducing an ultrafast ultrasound (US) method to detect muscle fiber motion from a certain depth of the muscle. Time delays between onsets of EMG-MMG, EMG-US, MMG-FORCE, US-FORCE, and EMG-FORCE were calculated as 20.5 ¡Ó 4.73, 28.63 ¡Ó 6.31, 19.21 ¡Ó 6.79, 30.52 ¡Ó 8.85, and 49.73 ¡Ó 6.99 ms, respectively. Intrarater correlation coefficient (ICC) was higher than MMG when ultrafast US was used for detecton of the £Gt EMG-US and £Gt US-FORCE, ICC values of 0.75 and 0.70, respectively. Synchronization of the ultrafast ultrasound with EMG and FORCE sensors can reveal reliable and clinically useful results related to the EMD and its components when muscle is voluntarily contracted. With ultrafast US, we detect onset from the certain depth of the muscle excluding the ti
URI: http://hdl.handle.net/10397/16199
EISSN: 1664-042X
DOI: 10.3389/fphys.2014.00494
Appears in Collections:Journal/Magazine Article

Access
View full-text via PolyU eLinks SFX Query
Show full item record

SCOPUSTM   
Citations

9
Last Week
1
Last month
0
Citations as of Aug 20, 2017

WEB OF SCIENCETM
Citations

7
Last Week
0
Last month
0
Citations as of Aug 13, 2017

Page view(s)

31
Last Week
4
Last month
Checked on Aug 14, 2017

Google ScholarTM

Check

Altmetric



Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.