Mean (± SEM) changes in SICI before and after sham, unilateral and bilateral stimulation. SICI decreased immediately following unilateral (18%) and bilateral stimulation (25%) with a 45 and 18% improvement at 30 minutes. SICI returned to baseline at 60 minutes in both conditions. *P < 0.05 compared with baseline. ^ P < 0.05 SICI compared with sham stimulation.