Physical Performance Testing Exercise Cardiac Stress Test Diagnostic Procedure A graded test to measure an individual's heart rate and oxygen intake while undergoing strenuous physical exercise; most often assessed on a treadmill. Exercise Cardiac Stress Test A graded test to measure an individual's heart rate and oxygen intake while undergoing strenuous physical exercise, as on a treadmill. ACC/AHA C0015260 Exercise Stress Test C168192 Exercise Cardiac Stress Test ECST