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Neuromuscular fatigue and corticospinal excitability represented as % change from pre- to postexercise. A: maximal voluntary contraction (MVC). B: potentiated quadriceps twitch torque (Qtw,pot). C: voluntary activation (VA). D: changes in motor evoked potentials (MEPs) were evoked during a quadriceps contraction corresponding to 20% of the electromyogram (EMG) obtained during the preexercise MVC. Data are presented as means ± SE. PL, placebo; VitC, ascorbate. *P < 0.05 vs. PL. N = 8.
