Features of the Two-Dimensional sEMG Signal: EMG Feature Imaging

The concept of the time-varying spatial distribution of the instantaneous EMG potential on the skin above a muscle is extended to the maps of EMG features. Applications to the interpretation of averaged amplitude maps and of maps of spectral variables are outlined, with a few examples. The utility of these maps in the study of muscles and in the identification of electrode locations is discussed. Common mistakes and pitfalls in electrode placement are pointed out.

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