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. Author manuscript; available in PMC: 2016 Jan 21.
Published in final edited form as: J Biomech. 2014 Dec 9;48(2):195–203. doi: 10.1016/j.jbiomech.2014.12.003

Figure 5. Maximal force generation capacity and endurance time for the Onion-Skin and AHP schemes.

Figure 5

A) Output muscle force for the Onion-Skin and AHP schemes when motor unit firing rates are doubled (red) from their value at maximal input excitation (green) in the FDI (left) and VL (right) muscles. B) Time-dependent motor unit (MU) force (top) and muscle force (bottom) force for the Onion-Skin and AHP schemes in the FDI (left) and VL (right) muscles. Six and seven motor units are shown for clarity in the FDI and VL, respectively. The amplitude of the motor unit force twitches decrease as a function of time, firing rate and recruitment threshold determining different time-varying patterns in the individual MU forces.