An Approach for Simulation of the Muscle Force Modeling It by Summation of Motor Unit Contraction Forces
Figure 4
Comparison between synchronous and asynchronous and regular and irregular impulsation patterns for the simulated muscle model. 50 stimuli are applied to each MU. (a), (c), (e), and (g) show the impulsation patterns. (b), (d), (f), and (h) show the respective calculated forces. (a) and (c) show the respective synchronous and asynchronous patterns of stimuli at equal IPIs, presented for each MU as row of dots in the time scale. The frequency in both cases is 60 Hz (equal IPIs of 16.6 ms). The asynchronous pattern (c) is modeled by time shifting of the first spike of each MU with randomly chosen constants, from 0 to 40 ms. (b) and (d) show the calculated forces of (red), FR (blue), and FF MUs (green), as well as of the whole muscle (black) for the respective impulsation patterns given in (a) and (c). (e) and (g) show the respective synchronous and asynchronous irregular patterns of stimuli, presented as dots. The IPIs are randomly generated with mean value of 16.6 ms (mean frequency of 60 Hz). The same irregular synchronous pattern is applied for all MUs in (e). The irregular patterns in (g) are different for each MU. (f) and (h) show the calculated forces of (red), FR (blue), and FF MUs (green) as well as of the whole muscle (black) for the respective patterns given in (e) and (g).
