Department of Health and Exercise Science, University of Oklahoma, Norman, OK, USA.
Physiol Meas. 2009 Dec;30(12):1465-71. doi: 10.1088/0967-3334/30/12/012. Epub 2009 Nov 20.
The purpose of this study was to use laser displacement sensors to examine the cross-correlation of surface mechanomyographic (MMG) signals detected from the rectus femoris muscle in perpendicular and transverse axes during isometric muscle actions of the leg extensors. Ten healthy men (mean +/- SD age = 22.1 +/- 1.6 years) and ten healthy women (age = 24.4 +/- 2.8 years) volunteered to perform submaximal to maximal isometric muscle actions of the dominant leg extensors. During each muscle action, two separate MMG signals were detected from the rectus femoris with laser displacement sensors. One MMG sensor was oriented in an axis that was perpendicular (PERP) to the muscle surface, and the second sensor was oriented in an axis that was transverse (TRAN) to the muscle surface. For each subject and force level, the MMG signals from the PERP and TRAN sensors were cross-correlated. The results showed maximum cross-correlation coefficients that ranged from R(x)(,y) = 0.273 to 0.989, but all subjects demonstrated at least one coefficient greater than 0.89. These findings showed a high level of association between the MMG signals detected in the perpendicular and transverse axes. Thus, it may not be necessary to detect MMG signals in multiple axes.
本研究旨在使用激光位移传感器检查在腿伸展肌等长肌肉收缩期间，从股直肌表面在垂直和横向轴上检测到的表面肌电（MMG）信号的互相关。10 名健康男性（平均年龄 +/- SD = 22.1 +/- 1.6 岁）和 10 名健康女性（年龄 = 24.4 +/- 2.8 岁）自愿进行主导腿伸展肌的亚最大至最大等长肌肉收缩。在每次肌肉收缩期间，使用激光位移传感器从股直肌上检测到两个单独的 MMG 信号。一个 MMG 传感器在垂直于（PERP）肌肉表面的轴向上定位，第二个传感器在横向（TRAN）于肌肉表面的轴向上定位。对于每个受试者和力水平，PERP 和 TRAN 传感器的 MMG 信号进行互相关。结果显示，最大互相关系数范围从 R(x)(,y) = 0.273 到 0.989，但所有受试者均显示出至少一个大于 0.89 的系数。这些发现表明在垂直和横向轴上检测到的 MMG 信号之间存在高度关联。因此，可能不需要在多个轴上检测 MMG 信号。
