![]() ![]() The electrically braked ergometer provides direct quantification of the work performed and can be computer controlled to change work rate incrementally or continuously. The mechanically braked ergometers generally do not offer precise work rate settings and require the individual to pedal at a fixed cadence to keep the work rate constant. There are two types of cycle ergometers: mechanically braked and electrically braked. ![]() The rate at which the external work is performed is also easily quantified. The cycle ergometer is less likely to introduce artifact into the measurements. In addition, maximal oxygen uptake is reported to be 5-10% higher on the treadmill than a cycle ergometer. Most individuals are more familiar with walking as an activity than cycling. The treadmill test has several advantages over the cycle ergometry. The protocol should be selected based on the objectives of the test and the patient’s clinical condition. There are several incremental protocols, i.e., Bruce, used for this testing. The motor-driven treadmill increases exercise stress through a combination of speed and elevation or grade increases. Two modes of exercise are commonly used in CPET: treadmill and cycle ergometer. In certain clinical situations, an additional measurement of arterial blood gases may be used to assess pulmonary gas exchange. These measurements are obtained during a maximal symptom-limited incremental exercise test. This would include but not be limited to the following:Ĭardiopulmonary exercise testing (CPET) provides a global assessment of the integrative exercise responses involving the pulmonary, cardiovascular, hematopoietic, neurophysiological, and skeletal muscle systems.Ĭardiopulmonary exercise testing involves measuring oxygen uptake (VO2), carbon dioxide output (VCO2), minute ventilation (VE) and other variables in addition to a 12-lead EKG, blood pressure monitoring and pulse oximetry (SpO2). CPET is considered not medically necessary when used to evaluate conditions not listed above. ![]()
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