 Study visit 2 will include an overnight stay in the Saint Marys Hospital Clinical Research Unit. Patients will check in to the CRU in the morning of day 1, visit 2. Prior to placement of stimulating electrodes an international normalized ratio INR will be checked to ensure safe clotting. An anesthesiologist will place the electrodes in the lumbarthoracic epidural space in a manner that is standard for the clinical placement of temporary electrodes in humans. The participants will then transfer to the clinical exercise laboratory to start the exercise protocol. Participants will rest 15 minutes prior to starting exercise. Exercise will take place on a vertical bike where they will perform a submaximal cycling exercise at 30 of peak work for 29 minutes. Thigh cuffs will be placed on thigh bilaterally and inflated intermittently to pressures of 80m mmHg. After the testing is complete, participants will return to their room in the Clinical Research Unit for the rest of the day and sty over night. 