Fig. 3

RMS of free-run EMG at resting state of four electrodes positions during the operation time. The RMS of free-run EMG recorded by SE were found to be higher than the NE, but no significant differences were found between SE with CP and SE without CP. RMS of all electrodes did not change from the beginning to the end of operations. NE(L): Needle electrodes (Left foot); NE(R): Needle electrodes (Right foot); SE with CP (L): Surface electrodes with conductive paste (Left foot); SE without CP (R): Surface electrodes without conductive paste (Right foot)