![]() ![]() Constant work rate testing, usually performed at a high fraction of maximal work rate is commonly performed before and after an intervention, such as bronchodilator therapy or exercise training.Cardiopulmonary exercise testing (CPET)ĬPET provides a comprehensive assessment of the exercise response, and reflects the influences (including interactions) of the cardiac, respiratory, musculoskeletal and hematological systems. Incremental testing provides information on maximal responses and anaerobic threshold. Both provide a wealth of physiologic data. Laboratory tests of exercise performance include the incremental and constant work rate cardiopulmonary exercise tests (CPET). ![]() They do not, however, provide much physiologic information on exercise limitation. Besides giving an overall measurement of exercise capacity, these are easy to perform, are related to daily functional activities, and may even predict morbidity or mortality. The former include the timed walk test (e.g., the 6 minute walk test) and the incremental and endurance shuttle walk tests. These can be divided into field and laboratory tests. Several types of exercise tests are commonly performed in the clinical assessment of patients. This provides the general rationale for exercise testing in the evaluation of exertional dyspnea. Furthermore, disease is often not confined to one organ system such as the lung, and testing the body's overall physiological response to exercise will provide useful data. ![]() Performing physiologic and subjective measurements during exercise often provides more relevant physiologic information and may give a more accurate estimate of functional capacity than testing done at rest in the laboratory. While this is often useful, exertional symptoms may correlate poorly with resting measurements. In essence, information from these tests which are performed in a resting state is used to assess a symptom which occurs with exertion. This often leads to respiratory assessments such as spirometry, lung volume assessments, diffusing capacity, arterial blood gas determination, or cardiac assessments such as echocardiography. Exertional dyspnea is a common problem in patients with chronic lung diseases. ![]()
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