EMG SIGNAL AMPLITUDE NORMALIZATION TECHNIQUE IN STRETCH-SHORTENING CYCLE MOVEMENTS
EMG SIGNAL AMPLITUDE NORMALIZATION TECHNIQUE IN STRETCH-SHORTENING CYCLE MOVEMENTS
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DOI：
10.1016/1050-6411(93)90013-m
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发表时间：
1993-12-01
影响因子：
2.5
通讯作者：
SINGER, KP
中科院分区：
文献类型：
--
作者：
ALLISON, GT;MARSHALL, RN;SINGER, KP
使用表面肌电图（EMG）分析功能性运动通常涉及记录拉伸缩短周期（SSC）期间的离心和同心肌肉活动。用于幅度标准化的技术是多种多样的，并且与所涉及的肌肉活动类型无关。本研究的目的是：（i）确定11个振幅归一化技术的影响的变异系数（CV）在偏心和同心阶段的SSC;和（ii）建立在可变负载和速度下的EMG信号的归一化技术的效果。本文记录了八名正常人在四种SSC状态和三种等长收缩水平下肱二头肌的肌电信号。导出的11个归一化值为等长收缩的总rms、平均rms和峰值rms（100 ms时间常数）以及每组等张收缩的总体值的平均rms和峰值rms值。使用最大自主等长收缩（MVIC）进行标准化，无论RMS处理（总、平均值或峰值）如何，均显示两种肌肉动作的原始数据CV更大。平均合奏值和次最大等距录音降低了同心数据的CV。没有振幅归一化技术降低了加载条件下偏心数据的CV。方差分析显示，差异有统计学意义（P
Analysis of functional movements using surface electromyography (EMG) often involves recording both eccentric and concentric muscle activity during a stretch-shorten cycle (SSC). The techniques used for amplitude normalization are varied and are independent of the type of muscle activity involved. The purpose of this study was: (i) to determine the effect of 11 amplitude normalization techniques on the coefficient of variation (CV) during the eccentric and concentric phases of the SSC; and (ii) to establish the effect of the normalization techniques on the EMG signal under variable load and velocity. The EMG signal of the biceps brachii of eight normal subjects was recorded under four SSC conditions and three levels of isometric contraction. The 11 derived normalization values were total rms, mean rms and peak rms (100 ms time constant) for the isometric contractions and the mean rms and peak rms values of the ensemble values for each set of isotonic contractions. Normalization using maximal voluntary isometric contractions (MVIC), irrespective of rms processing (total, mean or peak), demonstrated greater CV above the raw data for both muscle actions. Mean ensemble values and submaximal isometric recordings reduced the CV of concentric data. No amplitude normalization technique reduced the CV for eccentric data under loaded conditions. An ANOVA demonstrated significant (P