Abstract
An Electromyogram model for the Tibialis Anterior muscle with novel firing rate equation, recruitment threshold, and spatial localisation of muscle fibres has been designed. This model has used a parallel-fibred volume conductor equation for this pennate muscle. Surface EMG was simulated using the experimental based parameters. Eight healthy subjects performed isometric dorsiflexion at 10, 20, 30, 50, 75 and 100% maximal voluntary contractions. To validate this model, the root mean square (RMS) and median frequency (MNF) were computed for both the experimental and simulated EMG. The rate of change in normalised EMG RMS and median frequency with MVC was statistically analysed using ANOCOVA between experimental and simulated signal. The gradients were found to be similar (p> 0.05), suggesting that the parallel fibred TA muscle model is suitable for analysing changes in the EMG amplitude and median frequency with MVC.
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