Cross-correlation analyses of mechanomyographic signals from the superficial quadriceps femoris muscles during concentric and eccentric isokinetic muscle actions.
Cross-correlation analyses of mechanomyographic signals from the superficial quadriceps femoris muscles during concentric and eccentric isokinetic muscle actions.
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在向心和偏心等速肌肉动作期间股四头肌浅层肌肉的肌力信号的互相关分析。
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发表时间：
2003
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通讯作者：
G. Johnson
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作者：
J. Cramer;T. Housh;J. Weir;K. Ebersole;S. R. Perry;A. Bull;G. Johnson
本研究的目的是检查在最大、同心和偏心等速肌肉动作期间从股外侧肌 (VL)、股直肌 (RF) 和股内侧肌 (VM) 记录的肌力图 (MMG) 信号的互相关系数。 11 名女性（平均 +/- SD 年龄 = 21 +/- 1 岁）在 Cybex 6000 测力计上以 60 度 s-1 进行腿部伸肌的此类肌肉动作。通过压电晶体接触传感器以 1000 Hz 的频率同时从 VL、RF 和 VM 采样 MMG 信号。确定每个肌肉间比较（VL 与 RF、VL 与 VM 和 RF 与 VM）的峰值复合互相关系数 (rxy) 和共同方差 (rxy2)。结果表明，峰值互相关系数范围为 rxy = 0.38 至 0.52，而信号之间的共同方差 (rxy2) 在所有时间滞后 (tau = -50...) 范围内为 14% 至 27%。与其他研究相结合，这些结果表明，尽管存在一些串扰的可能性，MMG 测量可用于检查股四头肌浅层肌肉的 MMG 振幅模式和频率响应之间的差异。
The purpose of this investigation was to examine the cross-correlation coefficients of mechanomyographic (MMG) signals recorded from the vastus lateralis (VL), rectus femoris (RF), and vastus medialis (VM) muscles during maximal, concentric and eccentric isokinetic muscle actions. Eleven females (mean +/- SD age = 21 +/- 1 yr) performed such muscle actions of the leg extensors at 60 degrees.s-1 on a Cybex 6000 dynamometer. MMG signals were sampled simultaneously from the VL, RF, and VM at 1000 Hz by piezoelectric crystal contact sensors. Peak composite cross-correlation coefficients (rxy) and common variances (rxy2) were determined for each between-muscle comparison (VL vs. RF, VL vs. VM, and RF vs. VM). The results indicated peak cross-correlation coefficients ranging from rxy = 0.38 to 0.52, while common variances (rxy2) between signals ranged from 14% to 27% across all time lags (tau = -50...). In conjunction with other studies, these results suggested that despite the potential for some cross-talk, MMG measurements can be used to examine differences between the patterns of MMG amplitude and frequency responses of the superficial quadriceps femoris muscles.