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The accuracy of an exhaustive ramp incremental (RI) test to determine maximal oxygen uptake (V   ˙    O 2max ) was recently questioned and the utilization of a verification phase proposed as a gold standard. This study compared the oxygen uptake (V   ˙    O 2 ) during a RI test to that obtained during a verification phase aimed to confirm attainment ofV   ˙    O 2max . Sixty-one healthy males [31 older (O) 65 ± 5 yrs; 30 younger (Y) 25 ± 4 yrs] performed a RI test (15–20 W/min for O and 25 W/min for Y). At the end of the RI test, a 5-min recovery period was followed by a verification phase of constant load cycling to fatigue at either 85% ( n  = 16) or 105% ( n  = 45) of the peak power output obtained from the RI test. The highestV   ˙    O 2  after the RI test (39.8 ± 11.5 mL·kg −1 ·min −1 ) and the verification phase (40.1 ± 11.2 mL·kg −1 ·min −1 ) were not different ( p  = 0.33) and they were highly correlated ( r  = 0.99;  p  < 0.01). This response was not affected by age or intensity of the verification phase. The Bland-Altman analysis revealed a very small absolute bias (−0.25 mL·kg −1 ·min −1 , not different from 0) and a precision of ±1.56 mL·kg −1 ·min −1  between measures. This study indicated that a verification phase does not highlight an under-estimation ofV   ˙    O 2max  derived from a RI test, in a large and heterogeneous group of healthy younger and older men naïve to laboratory testing procedures. Moreover, only minor within-individual differences were observed between the maximalV   ˙    O 2  elicited during the RI and the verification phase. Thus a verification phase does not add any validation of the determination of aV   ˙    O 2max . Therefore, the recommendation that a verification phase should become a gold standard procedure, although initially appealing, is not supported by the experimental data.

Measurement of a True V˙O2max during a Ramp Incremental Test Is Not Confirmed by a Verification Phase