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• W2893480171 abstract "We compared non-negative matrix factorization (NMF) and convolution kernel compensation techniques for high-density electromyogram decomposition. The experimental data were recorded from nine healthy persons during controlled single degree of freedom (DOF) wrist flexion-extension, supination-pronation, and ulnar-radial deviation movements. We assembled the identified motor units and NMF components into three groups. Those active mostly during the first and the second movement direction per DOF were placed in the G1 and G3 groups, respectively. The remaining components were nonspecific for movement direction and were placed in the G2 group. In ulnar and radial deviation, the relative energies of identified cumulative motor unit spike trains (CSTs) and NMF components were similarly distributed among the groups. In other two movement types, the energy of NMF components in the G2 group was significantly larger than the energy of CSTs. We further performed a coherence analysis between CSTs and sums of NMF components in each group. Both decompositions demonstrated a solid match, but only at frequencies <;3 Hz. At higher frequencies, the coherence hardly exceeded the value of 0.5. Potential reasons for these discrepancies include the negative impact of motor unit action potential shapes and noise on NMF decomposition." @default.
• W2893480171 created "2018-10-05" @default.
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• W2893480171 date "2018-10-01" @default.
• W2893480171 modified "2023-10-02" @default.
• W2893480171 title "Comparison of Convolutive Kernel Compensation and Non-Negative Matrix Factorization of Surface Electromyograms" @default.
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• W2893480171 doi "https://doi.org/10.1109/tnsre.2018.2869426" @default.
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