- Constant-load exercise test in cycle ergometer and Constant-load exercise test in elliptical equipament: The two exercise tests were performed at 70% of the previously determined work rate in CPT. During the CSET, VO2 was measured breath-by-breath and averaged every three respiration, while SpO2, HR, and the electrocardiogram were continuously monitored, and calculated a on-Kinetics of VO2 and HR.