Studies on the accuracy of the gas exchange and ventilation parameters during exertion involving the Brazilian population are scarce in literature. OBEJCTIVE: To determine the reliability of the maximal oxygen intake (VO2max) and anaerobic threshold (AnT), as well as the objectivity of the AnT determination in Brazilian healthy youth adults. METHODS: Two tests of maximal exertion were applied. Two independent observers applied the visual inspection method for the AnT determination. The data were compared by means of the regression analysis, intraclass correlation coefficient (ICC), two-way ANOVA and the paired t-test for an alpha < 0.05. The intra-observer and intra-subject variabilities were determined by means of the typical error (s) and variation coefficient (VC). RESULTS: No significant differences between tests for the VO2max and AnT determination as well as between observers in AnT determination were observed. The new VO2max presented ICC = 0.97, s = ± 0.14 L • min-1, and VC = ± 5.5%. The AnT presented ICC = 0.90, s = ± 0.14 L • min-1, and VC = ± 9.2%. The inter-observers AnT determination presented ICC = 0.95, s = 0.1 L • min-1 and VC = 5.6%. CONCLUSION: The VO2max and the AnT are reliable measurements, and the AnT determination was demonstrated to be an objective method in the population studied.
Reliability; Objectivity; Maximal oxygen intake; Anaerobic threshold and ventilatory threshold
