DO THE FIBER-TYPE PROPORTION AND THE ANGULAR VELOCITY INFLUENCE THE MEAN POWER FREQUENCY OF THE ELECTROMYOGRAM
DO THE FIBER-TYPE PROPORTION AND THE ANGULAR VELOCITY INFLUENCE THE MEAN POWER FREQUENCY OF THE ELECTROMYOGRAM
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DOI：
10.1111/j.1748-1716.1988.tb08501.x
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发表时间：
1988-11-01
期刊：
影响因子：
--
通讯作者：
HENRIKSSONLARSEN, K
中科院分区：
文献类型：
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作者：
GERDLE, B;WRETLING, ML;HENRIKSSONLARSEN, K
本文研究了9名女性志愿者肌电(EMG)的平均功率频率和信号幅度与角速度和纤维类型比例的关系。受试者在不同的角速度(0.57、1.05、1.57、2.09和3.14rad S-1)下使用等速测功机进行最大伸膝运动。角度和扭矩信号与三个肌电信号同时记录在磁带录音机上。根据肌电记录确定平均功率频率(MPF)和信号幅度。取右股外侧肌活检，碱性和酸性mATPase染色以确定纤维型比例和面积，三种肌肉肌电的信号幅度和MPF均不依赖于角速度。股外侧肌MPF与股外侧肌的1型纤维比例呈显著负相关(r=-0.93)，相关系数为1.57rad S~(-1)，而纤维类型面积与MPF无显著相关性。总之，纤维类型比例是MPF背后的主要因素，与角速度无关。
The dependence of the mean‐power frequency and the signal amplitude of the electromyogram (EMG) on the angular velocity and the fibre‐type proportion were investigated in nine female volunteers. The subjects were required to perform maximum knee extensions using an isokinetic dynamometer at different angular velocities; 0.57, 1.05, 1.57, 2.09 and 3.14 rad S‐1. Electromyographic signals were obtained from the vastus lateralis, vastus medialis and the rectus femoris muscles. The angle and the torque signals were recorded simultaneously with the three EMG signals on a tape‐recorder. From the EMG recordings the mean power frequency (MPF) and the signal amplitude were determined. Muscle biopsies were later obtained from the right vastus lateralis and stained for alkaline and acid mATPase for the determination of fibre‐type proportions and areas.Neither the signal amplitude nor the MPF of the EMG of the three muscles were dependent on the angular velocity. The MPF of the vastus lateralis correlated significantly (r = ‐0.93) with the type 1 fibre proportion at 1.57 rad s‐1. However, there was no significant correlation between the areas of the fibre types, alone or together, and the MPF. In conclusion the fibre‐type proportion was the major factor behind the MPF irrespective of angular velocity.