The accuracy of two equations for predicting maximal oxygen uptake on individualized ramp protocol

Abstract

PurposeValid protocols use nomograms based on standardized stages to calculate maximal oxygen uptake (VO<sub>2</sub>max). Although the maximal ramp exercise protocol offers advantages over traditional protocols, it is not known if the non-standardized stages approach affects the accuracy to estimate VO<sub>2</sub>max. The study aims to examine the accuracy of 2 equations for predicting VO<sub>2</sub>max in a maximal ramp exercise test.MethodsOverall, 11 men (age: 26 ± 5 years, height: 178 ± 7 cm, weight: 77.6 ± 9.9 kg) underwent 3 sessions of a maximal ramp test on a motorized treadmill; the speed increments were equal but with 0, 3, and 6% grades. Expired gases were analysed with a portable metabolic system. The VO<sub>2</sub>max measured was set as the highest mean value observed from 7 consecutive breaths and it was predicted from 2 equations: American College Sports Medicine (ACSM) and Myers.ResultsVO<sub>2</sub>max predicted by ACSM equation (54.3 ± 6.7 mL • kg<sup>–1</sup> • min<sup>–1</sup>) was approximately 10 ± 10% higher and by Myers equation (30.6 ± 6.1 mL • kg<sup>–1</sup> • min<sup>–1</sup>) approximately 38 ± 11% lower than directly measured (49.6 ± 6.7 mL • kg<sup>–1</sup> • min<sup>–1</sup>, <i>p</i> < 0.05). Bland-Altman graphs indicate low and no agreement for ACSM and Myers equations, respectively. The calculated standard error of the estimates was 6.5 mL • kg<sup>–1</sup> • min<sup>–1</sup> for ACSM equation and 19.9 mL • kg<sup>–1</sup> • min<sup>–1</sup> for Myers equation.ConclusionsThe ACSM and Myers equations significantly over- and under-predict the VO<sub>2</sub>max of young adults, respectively. Although the former overestimated VO<sub>2</sub>max, we recommend its use with caution.