CARDIOPULMONARY EXERCISE TEST at J|medical
When a patient or an athlete (professional or amateur) needs to undergo an examination capable of assessing the health of the heart, lungs, and muscles, the most appropriate test currently available is the cardiopulmonary exercise test (CPET).
What does the cardiopulmonary exercise test measure? The capacity to engage in physical activity is directly linked to a person’s overall health. The cardiopulmonary exercise test analyses the adaptation of the respiratory and cardio-circulatory systems to the demands placed on the muscles during movement. In the presence of abnormalities, the test can identify the underlying cause. It is an important test for assessing a person’s capacity for physical activity and, consequently, can help us understand how healthy a person is.
Is it a complex test? Yes. This test uses technologically advanced equipment and requires specialised knowledge to be interpreted correctly, in order to provide a comprehensive and in-depth assessment of the patient’s health status. Knowing one’s level of physical performance is essential, particularly for patients and athletes.
What is the difference between this test and the standard cardiac stress test? The cardiac stress test evaluates how a person’s heart and circulatory system respond to exercise. The cardiopulmonary exercise test examines a broader range of factors, observing how the body’s various systems adapt in a coordinated and progressive manner during exercise. The test includes the assessment of breathing (ventilation), oxygen consumption (VO₂), and cardiac and metabolic parameters. The cardiopulmonary exercise test provides a comprehensive and detailed picture of a person’s physical performance, going beyond a purely cardiological evaluation.
What is the parameter that describes an athlete’s performance? The primary means of assessing exercise capacity is through a parameter known as maximal oxygen consumption (VO₂ max), which indicates how many millilitres of oxygen a person can utilise per minute per kilogram of body weight, in relation to predicted values based on age, sex, height, and weight. VO₂ max is influenced by various factors, including the lungs’ capacity to store air, the health of the heart and blood vessels, oxygen transport in the blood, and the way in which the body’s cells metabolise oxygen to generate the energy required for muscular contraction. The body’s ability to eliminate carbon dioxide (CO₂) through pulmonary ventilation is also important in determining how effectively a person can tolerate and manage physical activity.
Why is it important to know one’s VO₂ max? By performing the cardiopulmonary exercise test, it is possible to measure VO₂ max and the anaerobic threshold. For those who practise sport at a professional or amateur level, knowing these physical performance parameters is important for planning the most appropriate training programme and monitoring progress over time.
How is the test performed? The cardiopulmonary exercise test can be performed either on a bicycle (cycle ergometer) or on a treadmill. After a brief warm-up, the patient undergoing the test will be encouraged to perform physical exercise (pedalling on the bicycle or running on the treadmill) at an intensity that increases progressively, until the maximum tolerated workload is reached based on the individual’s level of fitness. During the test, 12-lead electrocardiogram (ECG) electrodes are used to measure the electrical activity of the heart, both at rest and during each phase of exercise, thus allowing the identification of any electrical abnormalities (arrhythmias) or deficits in blood supply to the cardiac muscle (ischaemia). A face mask is also applied to the patient to collect all data relating to pulmonary ventilation. These data are continuously processed by a gas analyser, enabling assessment of respiratory system adaptation, maximal oxygen consumption (VO₂ max), and the patient’s anaerobic threshold, along with all other relevant metabolic parameters. These details provide important information on the patient’s cardiorespiratory capacity and physical performance. How long does the test take? It lasts between 20 and 30 minutes and must always be performed under the supervision of specialised medical personnel.
