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Sample Boltzmann curves. Boltzmann sigmoidal function plotted versus stimulator intensity for one subject for vastus lateralis in Panel A, rectus femoris in Panel B and vastus medialis in Panel C. All motor-evoked potentials used in the modeling and the Boltzmann curves are presented for stimulus–response curves at 10 (●,
), 20 (○, 
) and 50% (▼, 
) of maximal voluntary force.
