An Approach for Simulation of the Muscle Force Modeling It by Summation of Motor Unit Contraction Forces
Figure 3
Main characteristics of the simulated muscle model: (a)–(c) representative tetanic forces of one , one FR, and one FF MU, obtained by application of 50 pulses with IPIs of 100, 33.3, 25, 16.6, and 10 ms (i.e., the frequencies of 10, 30, 40, 60 and 100 Hz from below to upwards), respectively. Note that the time scale is cut to 1000 ms for better viewing; (d)–(f) relationship between the normalized maximal tetanic force and the firing frequency for each of the MUs. The consecutive points correspond to the following frequencies: 1, 10, 12.5, 16.6, 20, 25, 30, 33.3, 40, 50, 60, 75, and 100 Hz. Black curves and points represent the simulated forces of the whole group of , FR, and FF MUs. The normalization for the figures (d), (e), and (f) is made individually for each MU with respect to the peak twitch force of the current MU (or the three groups of MUs), obtained for impulsation with 1 Hz.
