 CPX Test protocol Initially, 2 - 5 minutes of resting data is performed, ensuring patient comfort, and that the Respiratory Exchange Ratio RER falls below 1, indication the patient is not hyperventilating. Next, there is 1-3 minutes of unloaded cycling, followed by a graded increase in incremental workload. The leg speed throughout the test is maintained at 50-60 rpm to ensure constant effort. The patient is given verbal feedback and encouragement throughout the test. The test is stopped by the patient due to fatigue, pain, light headedness, or when they fail to maintain greater than 30 rpm for more than one minute despite encouragement. On completion of the exercise phase of the test, the patient is further monitored during the recovery period until heart rate reaches within 10 of pre-test, and all ST segments have normalised if applicable. 