EMG MEAN POWER FREQUENCY - OBTAINING A REFERENCE VALUE
EMG MEAN POWER FREQUENCY - OBTAINING A REFERENCE VALUE
复制标题
DOI：
10.1016/0268-0033(94)90007-8
复制
发表时间：
1994-07-01
影响因子：
1.8
通讯作者：
KADEFORS, R
中科院分区：
文献类型：
--
作者：
OBERG, T;SANDSJO, L;KADEFORS, R
肌电图平均功率频率的归一化通常基于单一估计来执行。基于此类单一估计的参考值的随机变化可能会严重损害以标准化形式报告的数据。在本研究中，我们检查了计算初始参考值的五个程序：0 公斤（重复）和 2 公斤手负荷下的校准收缩，以及 0 公斤和 2 公斤手负荷下的回归程序。如果考虑所有不同的常规，则受试者间差异较大，常规间差异中等，受试者内差异相当小。不同例程之间的相关性很高。在相同的负载水平下，校准和回归例程给出了相同的结果，但在较高的负载水平下变异性较小。所发现的变化幅度如此之大，以至于有必要减少随机变化的影响。为减少这种变异性而提出的程序是重复校准测量。斜方肌的首选测试位置是直臂、肩胛平面外展 90 度、手部负载 2 公斤。相关性结果对于所有使用光谱参数来估计生物力学、人体工程学和运动机能学中局部肌肉疲劳的人都很重要。
Normalization of the electromyographic mean power frequency is generally performed on the basis of single estimates. Random variation of reference values based on such single estimates can seriously impair data reported in normalized form. In the present study we have examined five procedures for calculation of an initial reference value: calibration contractions at 0-kg (repeated) and 2-kg hand load, and regression routines at 0-kg and 2-kg hand load. There was a large between-subject variation if all different routines were considered, a moderate between-routine variation, and a quite small within-subject variation. The correlation between the different routines was high. At the same load level calibration and regression routines gave equivalent results, but the variability was less at the higher load level. The variations found are of such a magnitude that it is necessary to reduce the influence of random variation. Procedure proposed for reduction of this variability is repeated calibration measurements. A preferred test position for the trapezius muscle is straight arm, 90 degrees of abduction in the scapular plane, 2-kg hand load.RelevanceThe results are important for all who use spectral parameters to estimate localized muscle fatigue in biomechanics, ergonomics, and kinesiology.