A stress test, sometimes called an exercise test, helps your doctor find out how well your body works when you are active. This test measures how well your heart, lungs and muscles function during physical activity. You will start out walking on a treadmill or riding a bicycle until you reach a point where you feel you cannot continue exercising.
Different types of breathing tests may be done during your exercise test depending on the reason for the testing. Pulmonary function tests are done before and after exercise to test your lung abilities. During these tests you will wear a nose clip and be asked to blow through a special mouthpiece that is connected to a computer. The results of these tests help us to identify lung problems that might affect your ability to exercise.
The second type of breathing test is done while you exercise on the bike or treadmill (Picture 2). You will wear special headgear that looks like a bicycle helmet and breathe through a snorkel-like mouthpiece connected to a special computer. The air that is collected during exercise tells the doctor how well your lungs and heart are working during exercise.
A small Band-Aid®-like sticker will be attached to your index finger before starting the exercise. This sticker has a special red light that detects how much oxygen is in your body.
You will wear a blood pressure cuff wrapped around the upper part of your arm. When the technician checks your blood pressure, you will feel the cuff get tight around your arm and then slowly become looser. In special cases, blood pressure measurements may also be performed on the leg.
Once you have reached a point in the exercise where you cannot go any farther the test
will be over. When the exercise portion of the test is finished you will be asked to identify the reasons that you needed to stop the test. The EKG lead wires will stay attached for about 10 to 15 minutes after you exercise so the technician can monitor your heart while you rest. If you did breathing tests before you exercised, you will be asked to do those again afterward to see how your lungs work when you have been active.