Spreading out Muscle Mass within a Hill-Type Model: A Computer Simulation Study
Figure 3
Computer simulation of accelerated contractions of six muscle models with the same overall mass (), maximum isometric force (), optimal length (), and maximum contraction velocity (). The muscles were fixed at one end and always fully active (). Models differ just with respect to the number of accelerated discrete point masses approximating a continuous distribution of muscle mass. The point masses were connected by an equal number (see insets in Figure 3) of contractile elements. Their respective optimal lengths were chosen equal to the optimal muscle length divided by . The graph depicts velocity (a), force (b), and effective mass (c) versus time. The effective mass to be expected for an exactly linear acceleration distribution along the muscle would be half of the muscle mass (; (6): ). The analytic solution for one CE accelerating one point mass predicts (see Appendix ) a typical time of for this muscle to approach . Note the hundredfold muscle mass, tenfold maximum isometric force and optimal length, respectively, and hundredfold time scale as compared to the results presented in Figure 2.
