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The present study aims to analyze the influence of motor unit regionalization within the muscle cross-sectional area on time- and frequency-domain properties of surface myoelectric EMG signal. Computer simulations were performed using a phenomenological model of the neuromuscular system. Different contraction intensities were simulated, and the RMS and median frequency of the EMG were calculated for different muscle cross-sectional area morphologies. The level of MU regionalization was adjusted in the model. Results showed that experimental force-EMG relations could be appropriately simulated by the model, irrespective of the muscle cross-sectional area morphology and the level of MU regionalization. However, the best fit between simulation and experimental data is influenced by the level of MU regionalization.

A computer simulation study on the influence of motor unit regionalization on the generation of surface myoelectric signals