Calculated angles and coefficients reflecting the similarity between the experimental curves and the predicted curves for all 33 MUs.

FitCo1 and AreaCo1 are these coefficients when the modeled curve is obtained as a sum of equal to the model of the first contraction twitches, according to the respective stimulation pattern. α1(j) is the angle calculated by using the Eq (1). FitCo2 and AreaCo2 are the coefficients for the experimental and modeled curve (the calculated experimental values of Ftetmin (j)(i) are used as input parameters for the prediction). FitCo3 and AreaCo3 are the coefficients for the experimental and modeled curve using the same angles α1(j) but for full prediction algorithm (i.e. values of Ftetmin (j)(i) are also predicted consecutively). α2(j) is the angle obtained by a sensitivity analysis so that the modeled curve is the most similar to the experimental one, and FitCo4 and AreaCo4 are the respective coefficients. α3(j) is the improved angle using the Eq (11) (see Fig 8), and FitCo5 and AreaCo5 are the respective coefficients.