Cardiopulmonary exercise test

What it is and how it works: An exercise stress or cardiopulmonary exercise test is used to assess the function of the heart and lungs during increased levels of activity. It involves walking on a treadmill, or riding a stationary bike, while your blood pressure, ECG, and breathing are recorded. During the test you will gradually exercise at a faster speed and a greater incline to make your heart and body work faster. This will usually go on for a total of 12 to 15 minutes. Although not painful, sometimes your symptoms might be brought on by exercise – it is important to tell your doctor if this happens. You should also wear comfortable clothes and trainers during the day of your test. Usually, the test will take about 30 minutes. 

What it detects: An exercise stress test can be used to detect coronary artery disease. If your test shows an abnormal heart rhythm or that the heart’s blood supply is insufficient, your doctor might recommend further tests.