Participants were asked to refrain from consuming caffeine for 12h before testing. They were also asked not to perform intensive physical activity for 72h before testing. The H-reflex and M-wave RC were recorded with three pulse durations: 0.05 ms (RC_0.05), 0.2 ms (RC_0.2) and 1 ms (RC₁). The RC started with a current intensity set below the H-reflex threshold (intensity evoking 3 responses out of 5 stimulations) and was gradually increased until the M_max was reached. Three stimuli were delivered at each intensity with an interstimulus of 10 s (Stein et al., 2007). Participants were asked to keep the same position and relax while recording the RC. As the decrease in H-reflex amplitude in the FCR observed for pulse duration greater than 1 ms should not be related to the biophysical properties of axons (Panizza et al., 1989), the longer pulse duration used in the present study was set at 1 ms.