Abstract
A series of statistical procedures are proposed to estimate the power spectrum (PS) of interference EMG and to compare several PS obtained under different conditions. These procedures are performed as an interactive program system and include: discovering stationary segments in a long EMG record and checking the stationarity by Mood's and Wilcoxon's range tests; estimation of EMG PS by using different windows, averaging and digital filtering; appropriate PS transformation to achieve Gaussian distribution; comparison of several PS by using the multiple range test of Newman-Keuls. This approach has been applied on interference EMG recorded from m. abductor digiti quinti and from m. biceps brachii during weak and moderate tensions. The results obtained allow us to recommed some of the tested procedures for routine spectral analysis of interference EMG.
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