Fig. 1.

MRI-compatible stepper exercise device in the initial position and a subject ready to begin exercising. The L-shaped lever arms have enclosures for weights at the end of the long arms (which are horizontal in orientation shown) and foot pedals for the subject’s feet at the end of the short arms (which are vertical in the orientation shown). The moving parts are fixed on a platform designed to sit securely on the MRI bed. A backpack-type shoulder harness and hand straps are used to enhance stability and decrease torso motion during exercise. A shielded electronic box with a motion sensor that transmits information regarding stepping cadence is installed on the platform.