Figure 5

Experimental, fitted, and predicted forces in response to the VFT20-VFT80 train combination from a typical subject at different shortening velocities during the model development phase. For each row, the shaded panel represents the fittings of the VFT20-VFT80 experimental data to that velocity, while the non-shaded panels represent model predictions to the other three velocities. For example, the shaded panel (f) at -75°/s represents the fitting of the isovelocity model to the experimental forces data, while the non-shaded panels (e), (g), and (h) are the predictions of the model at -25°/s, -125°/s, and -200°/s, respectively. These data were used to determine the best velocity to identify the parameters V₁ and V₂. RMS Force (N) errors between measured and modeled force data in response to the VFT20-VFT80 train are presented in each panel. It should be noted that the experimental data in the figure are means of two trails.