Participants will lay on their back and have small electrodes placed on the center of their backs and several leg muscles. The back electrodes, connected to a battery-operated unit, will send an electrical current to the spine. The leg electrodes will record muscle activity. This will take approximately 4 hours to complete on each day. The 4 hours includes set-up/placement of the electrodes for each device, 4 trials of stimulation for each device with breaks, and removal of electrodes after testing on each device.

Participants will have electrodes connected to the STEPPS stimulator, placed over spinal site locations (T10/11 & T11/12). These electrodes will send an electrical current to their spine while laying on their back. Additional electrodes will be placed over right leg muscles to measure leg EMG muscle activation during the spinal stimulation. The same procedures will be used for the ARC-ex stimulator.

Four trials of each stimulation device with EMG recording will be given over the course of 4 hours each visit for 3 visits.

Mean/standard deviation curves and correlation coefficients for right leg muscle activation will be calculated to compare curves for NRT (pre-existing data) and each stimulator.