Then you will begin to exercise by walking on a treadmill. The difficulty level or rate of activity will be steadily increased. At regular intervals, the lab staff will ask how you are feeling. Let them know if you are experiencing chest or arm discomfort, dizziness, short of breath, lightheaded or any other unusual symptoms. It is normal for your blood pressure, heart rate, breathing rate and perspiration to increase during the treadmill stress test. The lab staff will also be continuously monitoring your ECG for anything that suggests that the test should be stopped. After the test, you will walk for a couple of minutes more to cool down. The lab staff will continue to monitor your ECG, blood pressure and heart rate until the levels normalise.