Data analysis
EVENT, CONTRACTION
Data were analysed using built-in functions in Spike2 v7.02a software (Cambridge Electronic Design). MEP area and Mmax area were calculated from biceps brachii EMG following cortical and brachial plexus stimulations, respectively. MEP area and Mmax area was calculated from the first deflection from baseline created by the stimulation to the end of the waveform (which was defined as the return to baseline after all phases of the wave had ended). MEPs were normalised to Mmax, and then averaged for each contraction intensity. TMS-evoked silent period duration was calculated as the time from the stimulus artifact to the return of EMG activity following the TMS pulse (SP was calculated in Spike2 by placing cursors at each event). SPs were averaged for each contraction intensity.