Beck Travis W, Housh Terry J, Fry Andrew C, Cramer Joel T, Weir Joseph P, Schilling Brian K, Falvo Michael J, Moore Christopher A
Department of Health and Exercise Science, Biophysics Laboratory, University of Oklahoma, 1401 Asp Avenue, 110 Huston Huffman Center, Norman, Oklahoma 73019-6081, USA.
Muscle Nerve. 2009 Mar;39(3):355-63. doi: 10.1002/mus.21208.
The purpose of this study was to use a wavelet analysis designed specifically for surface mechanomyographic (MMG) signals to examine the MMG responses of the vastus lateralis (VL), rectus femoris (RF), and vastus medialis (VM) muscles. Fifteen healthy men [age (mean +/- SD): 26.4 +/- 6.1 years] volunteered to perform isometric muscle actions of the dominant leg extensors at 20%, 40%, 60%, 80%, and 100% of the maximum voluntary contraction (MVC). During each muscle action, surface MMG signals were detected from the VL, RF, and VM and processed with the MMG wavelet analysis. The results show that, for the VL and VM muscles, there was compression of the total MMG intensity spectra toward low frequencies for most force levels above 20% MVC. For the RF, however, the peak of the total MMG intensity spectrum occurred at approximately 30-40 HZ for all force levels. Because the VL, RF, and VM are all innervated by the femoral nerve, the discrepancies among the three muscles for total MMG intensity in each wavelet band may have been due to differences in architecture, muscle stiffness, and/or intramuscular pressure.
本研究的目的是使用专门为表面肌动图（MMG）信号设计的小波分析，来检测股外侧肌（VL）、股直肌（RF）和股内侧肌（VM）的MMG反应。15名健康男性[年龄（均值±标准差）：26.4±6.1岁]自愿以最大自主收缩（MVC）的20%、40%、60%、80%和100%进行优势腿伸肌的等长肌肉动作。在每次肌肉动作期间，从VL、RF和VM检测表面MMG信号，并使用MMG小波分析进行处理。结果表明，对于VL和VM肌肉，在高于MVC 20%的大多数力水平下，总MMG强度谱向低频压缩。然而，对于RF，在所有力水平下，总MMG强度谱的峰值出现在约30 - 40赫兹处。由于VL、RF和VM均由股神经支配，三个肌肉在每个小波带中的总MMG强度差异可能是由于结构、肌肉僵硬度和/或肌内压力的不同所致。
