The estimation of maximum oxygen consumption (VO2max) with the ergospirometric system, considered the gold standard, is not easily feasible for the general population. Therefore, indirect tests are commonly used. This study aimed to compare the VO2max determined by an ergospirometric system with values estimated by the Polar V800 device. 17 male recreational runners (29.89 ± 6.84 years) performed a cardiorespiratory test on a programmable treadmill (ATL model, Inbramed, Brazil). Gas exchange and ventilatory variables were measured breath by breath, using a metabolic analyzer system (Ergoestik Geratherm®, Germany). VO2max was indirectly estimated with the Polar V800. Data normality was analyzed using the Shapiro-Wilk test. The intraclass correlation coefficient and the standard error of measurements (SEM) were used to verify reliability. Pearson's correlation coefficient test was applied. Statistical significance was established at p<0.05. Polar V800 demonstrated low levels of SEM (1.83 mL/kg/min). There was a moderate-strong intraclass correlation between repetitions for both methods (ICC = 0.69; p = 0.01), a moderate correlation (r = 0.54; R2 = 0.29; p = 0.02), and excellent agreement between methods. The Polar V800 can be used to indirectly measure the VO2max in recreational runners.
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