Verification-phase tests show low reliability and add little value in determining V̇O2max in young trained adults

Jonathan Wagner, Max Niemeyer, Denis Infanger, Timo Hinrichs, Clement Guerra, Christopher Klenk, Karsten Königstein, Christian Cajochen, Arno Schmidt-Trucksäss and Raphael Knaier

PLOS ONE, 2021, vol. 16, issue 1, 1-14

Abstract: Objective: This study compared the robustness of a V˙O2-plateau definition and a verification-phase protocol to day-to-day and diurnal variations in determining the true V˙O2max. Further, the additional value of a verification-phase was investigated. Methods: Eighteen adults performed six cardiorespiratory fitness tests at six different times of the day (diurnal variation) as well as a seventh test at the same time the sixth test took place (day-to-day variation). A verification-phase was performed immediately after each test, with a stepwise increase in intensity to 50%, 70%, and 105% of the peak power output. Results: Participants mean V˙O2peak was 56 ± 8 mL/kg/min. Gwet’s AC1 values (95% confidence intervals) for the day-to-day and diurnal variations were 0.64 (0.22, 1.00) and 0.71 (0.42, 0.99) for V˙O2-plateau and for the verification-phase 0.69 (0.31, 1.00) and 0.07 (−0.38, 0.52), respectively. In 66% of the tests, performing the verification-phase added no value, while, in 32% and 2%, it added uncertain value and certain value, respectively, in the determination of V˙O2max. Conclusion: Compared to V˙O2-plateau the verification-phase shows lower reliability, increases costs and only adds certain value in 2% of cases.

Date: 2021
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Persistent link: https://EconPapers.repec.org/RePEc:plo:pone00:0245306

DOI: 10.1371/journal.pone.0245306

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