Stress exercise system with treadmill and respiratory/metabolic assessment. The system includes an ECG amplifier, chart recorder, display, console, treadmill and modules for respiratory/metabolic assessment. Used to determine patient's functional capacity, predict and diagnose cardiopulmonary and vascular diseases and for rehabilitation of patients recovering from leg injuries or other type of illness. Some vendors require a NEMA 5-20R non-locking receptacle for their treadmills.