Surface mechanomyogram reflects the changes in the mechanical properties of muscle at fatigue
Surface mechanomyogram reflects the changes in the mechanical properties of muscle at fatigue
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表面肌力图反映疲劳时肌肉力学性能的变化
DOI：
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发表时间：
1999
期刊：
影响因子：
--
通讯作者：
A. Veicsteinas
中科院分区：
文献类型：
--
作者：
C. Orizio;B. Diemont;F. Esposito;E. Alfonsi;G. Parrinello;A. Moglia;A. Veicsteinas
摘要肌肉的收缩特性通常通过分析电诱发收缩过程中记录的力信号来研究。电刺激的肌肉显示可以由加速度计检测到的表面振荡;加速度信号被称为表面机械肌电图（MMG）。在这里描述的研究中，我们比较了，在人类胫骨前肌，MMG和力信号特性的变化之前，疲劳后立即，以及在6分钟的恢复，当肌肉的收缩特性发生变化。持续的电刺激会引起疲劳。最后的目的是评估的可靠性的MMG作为一种工具，以遵循肌肉的机械性能的变化所造成的疲劳。由于疲劳，力峰值、力产生峰值速率和力产生加速度峰值（d2 F/dt 2）的参数减小，而收缩时间和半松弛时间（1/2-RT）增加。MMG峰-峰（p-p）也降低。疲劳后，随着刺激频率的增加，力振荡幅度和MMG p-p的衰减率更大。除½-RT外，所有力和MMG参数均在恢复后2 min内恢复。在非疲劳肌肉和恢复过程中，MMG和d2 F/dt 2之间存在高度相关性。总之，MMG反映了肌肉力学的特定方面，可用于跟踪由局部肌肉疲劳引起的肌肉收缩特性的变化。
Abstract The contractile properties of muscle are usually investigated by analysing the force signal recorded during electrically elicited contractions. The electrically stimulated muscle shows surface oscillations that can be detected by an accelerometer; the acceleration signal is termed the surface mechanomyogram (MMG). In the study described here we compared, in the human tibialis anterior muscle, changes in the MMG and force signal characteristics before, and immediately after fatigue, as well as during 6 min of recovery, when changes in the contractile properties of muscle occur. Fatigue was induced by sustained electrical stimulation. The final aim was to evaluate the reliability of the MMG as a tool to follow the changes in the mechanical properties of muscle caused by fatigue. Because of fatigue, the parameters of the force peak, the peak rate of force production and the peak of the acceleration of force production (d2F/dt2) decreased, while the contraction time and the half-relaxation time (½-RT) increased. The MMG peak-to-peak (p-p) also decreased. The attenuation rate of the force oscillation amplitude and MMG p-p at increasing stimulation frequency was greater after fatigue. With the exception of ½-RT, all of the force and MMG parameters were restored within 2 min of recovery. A high correlation was found between MMG and d2F/dt2 in un-fatigued muscle and during recovery. In conclusion, the MMG reflects specific aspects of muscle mechanics and can be used to follow the changes in the contractile properties of muscle caused by localised muscle fatigue.
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DOI：
10.1152/ajpcell.1992.262.6.c1507
发表时间：
1992
期刊：
The American journal of physiology
影响因子：
--
作者：
Thompson,LV;Balog,EM;Fitts,RH
通讯作者：
Fitts,RH
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DOI：
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发表时间：
1992
期刊：
Electromyography and clinical neurophysiology
影响因子：
--
作者：
Barry,DT
通讯作者：
Barry,DT
DOI：
10.1152/ajpcell.1992.262.6.c1500
发表时间：
1992
期刊：
The American journal of physiology
影响因子：
--
作者：
Thompson,LV;Balog,EM;Riley,DA;Fitts,RH
通讯作者：
Fitts,RH
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DOI：
10.1152/jappl.1987.62.5.2075
发表时间：
1987
期刊：
Journal of applied physiology (Bethesda, Md. : 1985)
影响因子：
--
作者：
Metzger,JM;Fitts,RH
通讯作者：
Fitts,RH