Detection of the electromechanical delay and its components during voluntary isometric contraction of the quadriceps femoris muscle.
Detection of the electromechanical delay and its components during voluntary isometric contraction of the quadriceps femoris muscle.
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DOI：
10.3389/fphys.2014.00494
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发表时间：
2014
影响因子：
4
通讯作者：
Zheng YP
中科院分区：
文献类型：
--
作者：
Begovic H;Zhou GQ;Li T;Wang Y;Zheng YP
机电延迟（EMD）被描述为第一次触发和力输出之间经过的时间。基于测量方法已经报告了各种结果，当触发由自主收缩引起时观察到不一致的结果。然而，机械肌电（MMG）传感器放置在远离收缩肌肉的皮肤上，用于检测肌纤维运动和兴奋收缩（EC）耦合，这可能会给出不可靠的结果。在此基础上，本研究的目的是在主动肌肉收缩过程中检测EMD，同时引入超快超声（US）方法从肌肉的一定深度检测肌纤维运动。EMG-MMG、EMG-US、MMG-FORCE、US-FORCE和EMG-FORCE发作之间的时间延迟分别计算为20.5 ± 4.73、28.63 ± 6.31、19.21 ± 6.79、30.52 ± 8.85和49.73 ± 6.99 ms。超快超声检测Δ tEMG-US和Δ tUS-FORCE时的后内相关系数（ICC）高于MMG，ICC值分别为0.75和0.70。超快超声与EMG和FORCE传感器的同步可以揭示当肌肉自愿收缩时与EMD及其组分相关的可靠且临床有用的结果。利用超快US，我们检测从肌肉的特定深度开始的发作，排除肌肉上方的组织作为低通滤波器，这可能导致关于收缩肌纤维的发作的不准确时间检测。通过这种非侵入性技术，可以促进对肌肉动力学的理解。
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 ± 4.73, 28.63 ± 6.31, 19.21 ± 6.79, 30.52 ± 8.85, and 49.73 ± 6.99 ms, respectively. Intrarater correlation coefficient (ICC) was higher than MMG when ultrafast US was used for detecton of the Δt EMG-US and Δt 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 tissues above the muscle acting as a low-pass filter which can lead to inaccurate time detection about the onset of the contracting muscle fibers. With this non-invasive technique, understanding of the muscle dynamics can be facilitated.
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影响因子：
2.5
作者：
Herda, Trent J.;Housh, Terry J.;Cramer, Joel T.
通讯作者：
Cramer, Joel T.
影响因子：
3.4
作者：
Esposito, Fabio;Ce, Emiliano;Veicsteinas, Arsenio
通讯作者：
Veicsteinas, Arsenio
影响因子：
2.5
作者：
Howatson, Glyn;Glaister, Mark;van Someren, Ken A.
通讯作者：
van Someren, Ken A.
影响因子：
3.4
作者：
Hug, Francois;Gallot, Thomas;Nordez, Antoine
通讯作者：
Nordez, Antoine
DOI：
10.1016/j.jelekin.2008.08.005
发表时间：
2009-10-01
期刊：
Journal of electromyography and kinesiology : official journal of the International Society of Electrophysiological Kinesiology
影响因子：
--
作者：
Blackburn, J Troy;Bell, David R;Engstrom, Lauren A
通讯作者：
Engstrom, Lauren A