An electrically-powered device designed to be used as a component of a stress test system that permits the evaluation of a patient's physiologic response to physical stress (e.g., workload testing of the cardiac and/or pulmonary disorders/function). It is designed for walking, jogging, or running on a moving belt that facilitates physical exercise while the patient remains on the spot (i.e., treadmill). It consists of an endless, continuous track (e.g., a shock-absorbing rubber belt rotating on rollers) that rotates at varying speeds and elevation, electric motors, and controls. It will typically incorporate front and side-mounted rails to allow the user to steady themselves.