Mechanomyographic and electromyographic amplitude and frequency responses during fatiguing isokinetic muscle actions of the biceps brachii.
Mechanomyographic and electromyographic amplitude and frequency responses during fatiguing isokinetic muscle actions of the biceps brachii.
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肱二头肌疲劳等速肌肉动作期间的肌力图和肌电图振幅和频率响应。
DOI：
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发表时间：
2004
期刊：
影响因子：
--
通讯作者：
M. Malek
中科院分区：
文献类型：
--
作者：
T. Beck;T. Housh;G. Johnson;Joseph P. Weir;J. Cramer;J. Coburn;M. Malek
本研究的目的是探讨肱二头肌在疲劳等速运动过程中的机械肌电（MMG）和肌电图（EMG）振幅和平均功率频率（MPF）模式。10名成年人[3名女性（平均+/- SD年龄= 20 +/- 2岁）和7名男性（平均+/- SD年龄= 23 +/- 3岁）]自愿在180 ° x s（-1）下进行50次肱二头肌最大同心等速肌肉动作。等速峰值扭矩（PT）的下降百分比（平均值+/- SD）为70 +/- 17%，多项式回归分析表明PT与重复次数之间存在三次关系（R2 = 0.994）。MMG振幅和MMG MPF均呈线性下降（r2 = 0. 001）。774和0.238）。EMG振幅的结果显示重复次数之间的立方（R2 = 0.707）模式，其中EMG振幅在重复次数1-20期间增加，在重复次数20-40期间保持稳定，并且在重复次数40-50期间增加。有一个二次方程（R2 = 0。939)在整个测试过程中减少EMG MPF。MMG振幅和MMG MPF的降低可能是由于快速疲劳运动单位的去招募、肌肉顺应性降低或“肌肉智慧”的影响。“EMG振幅的结果可能反映了受试者的非最大努力和/或外周疲劳。确定EMG MPF降低的因素尚不清楚，尽管肌纤维动作电位传导速度的降低可能是部分原因。
The purpose of this investigation was to examine the mechanomyographic (MMG) and electromyographic (EMG) amplitude and mean power frequency (MPF) patterns during fatiguing isokinetic muscle actions of the biceps brachii. Ten adults [three women (mean +/- SD age = 20 +/- 2 yrs) and seven men (mean +/- SD age = 23 +/- 3 yrs) ] volunteered to perform 50 consecutive maximal, concentric isokinetic muscle actions of the biceps brachii at 180 degrees x s(-1). The percent decline (mean +/- SD) in isokinetic peak torque (PT) was 70 +/- 17% and polynomial regression analyses indicated a cubic relationship (R2 = 0.994) between PT and repetition number. Both MMG amplitude and MMG MPF decreased linearly (r2 = 0. 774 and 0.238, respectively) across repetitions. The results for EMG amplitude demonstrated a cubic (R2 = 0.707) pattern across repetitions, where EMG amplitude increased during repetitions 1-20, remained stable during repetitions 20-40, and increased during repetitions 40-50. There was a quadratic (R2 = 0. 939) reduction in EMG MPF throughout the test. The decreases in MMG amplitude and MMG MPF may have been due to de-recruitment of fast fatiguing motor units, a reduction in muscular compliance, or the effects of "muscle wisdom." The results for EMG amplitude may have reflected nonmaximal efforts by the subjects and/or peripheral fatigue. The factor(s) determining the decrease in EMG MPF are unclear, although a reduction in muscle fiber action potential conduction velocity may have been partially responsible.
DOI：
10.5555/uri:pii:0003999386903941
发表时间：
1986-04
影响因子：
4.3
作者：
Daniel T. Barry;James A. Leonard;Andrew J. Gitter;Richard D. Ball
通讯作者：
Daniel T. Barry;James A. Leonard;Andrew J. Gitter;Richard D. Ball
表面肌电图的频谱表示与人类咬肌纤维类型分布和大小之间的关联。
DOI：
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发表时间：
1987
期刊：
Electromyography and clinical neurophysiology
影响因子：
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作者：
Westbury,JR;Shaughnessy,TG
通讯作者：
Shaughnessy,TG