It is a test measures the effects of exercise on the heart. It is one of the screening tests applied by cardiologists and technicians. It provides information about the overall health of the heart. During the test the patient's heart while walking or running on a treadmill is electrically recorded and analyst by the computer . The body's increased oxygen demand of the heart which is shown. It is a measure of the hearts reaction in rest, whereas some abnormalities which is not seen in the ECG can be detected in this test.