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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 |
Issue Date: | 23-Dec-2014 | Source: | Frontiers in physiology, 23 Dec. 2014, v. 5, 494, p. 1-8 | 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 | Keywords: | Contractile components Electromechanical delay Excitation-contraction coupling Rectus femoris muscle Series elastic components Transient ultrasound |
Publisher: | Frontiers Research Foundation | Journal: | Frontiers in physiology | EISSN: | 1664-042X | DOI: | 10.3389/fphys.2014.00494 | Rights: | © 2014 Begovic, Zhou, Li, Wang and Zheng. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY) (https://creativecommons.org/licenses/by/4.0/). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms. The following publication Begovic H, Zhou G-Q, Li T, Wang Y and Zheng Y-P (2014) Detection of the electromechanical delay and its components during voluntary isometric contraction of the quadriceps femoris muscle. Front. Physiol. 5:494,1-8 is available at https://dx.doi.org/10.3389/fphys.2014.00494 |
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