Objectives To test the reliability of the VO2 Master Pro and to compare it to the Cosmed Quark. Equipment and methods Eight recreational cyclists participated in two different trials which consisted of graded cycling exercise stages at 50%, 70%, and 85% of their critical power. The VO2 Master Pro was used during the first visit, while both the VO2 Master Pro and Cosmed Quark were used during the second visit. Equivalence testing of the trials was done by TOST analysis while test of difference was done by ANOVA. Results The results indicated equivalence of the VO2 Master Pro in the measurement of VO2 (35.1 ± 10.4 mL·kg-1·min-1 vs. 35.4 ± 10.2 mL·kg-1·min-1) and VE (72.4 ± 20.5 L·min-1 vs 73.8 ± 22.3 L·min-1) across repeated visits indicating good reliability of the device. However, neither significant equivalence nor difference was detected when comparing the VO2 Master Pro to the Cosmed Quark across the same variables indicating that the two devices were similar to each other.
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