Multichannel Surface EMG Decomposition Based on Measurement Correlation and LMMSE

Figure 5

Results obtained from first dorsal interosseous (FDI) muscle. (a) MU discharge patterns with the force profile identified from the FDI muscle during an isometric constant force contraction at 10% MVC (2 N (Subject A). Each vertical line indicates a MU discharge at a given time instant. ((b) Top panel) the sum of identified MUAP trains (grey lines) compared to the raw sEMG signal (black lines) in one selected channel from the first dorsal interosseous (FDI) muscles during an isometric constant force contraction at 10% MVC (Subject A). ((b) Middle panel) an expended view of the top panel. ((b) Bottom panel) the residual (grey lines) compared to the raw sEMG (black lines) after the subtraction of the reconstructed MUAP trains. (c) MU firing patterns identified from Group 1 (black lines) and Group 2 (grey lines). All 64 channel signals were divided into 2 independent groups, with the even numbered columns selected as one group and the odd numbered columns as the other group.

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