Validade de critério concorrente e preditiva do VO2máx estimado em esteira pela reserva do consumo de oxigênio e frequência cardíaca

Abstract

The estimate of maximal oxygen uptake (VO2Max) has been recommended for evaluation and exercise prescription for non-athletes because its low cost and complexity of direct measurements of oxygen consumption. The most devoted submaximal protocol among those available is the Åstrand and Rhyming, which has been enhanced by Swain et al. This study aims to establish the concurrent and predictive criterion validity of estimating the VO2Max. The study included 34 college students, who made two visits. In the first, a submaximal test and familiarization to the maximum graded exercise test protocol was performed. In the second submaximal test was performed again and the maximum graded exercise test with ten minute intervals between them. Bland Altman with real and estimated VO2Máx was used to determine the concurrent validity of the estimates of VO2Max. In addition, a linear regression was performed to determine the SSE. To determine the predictive validity, was used VO2Max_Est as predictor and vVO2Max as outcome. For comparison purposes, the same analysis was conducted for the VO2Max_Med. The differences between the means and the VO2Max_Est vs. VO2Max_Med resulted in a Bias of 0.58 ± 5.63 mL.kg-1.min-1. These results indicate no tendency to under- or overestimation. There was great correlation relationship between VO2Max_Est and VO2Max_Med (r = 0.72; p <0.0001) with EPE 5.3 mL.kg-1.min-1. Regarding the VO2Max_Med, the error found amounted to approximately 11.0%. The predictive validity of the estimated of vVO2Max by VO2Max_Est was Almost Perfect (r = 0.90; p <0.0001 EPE = 0.87 km h-1). The same analysis for VO2Max_Med was classified as Large (r = 0.80, p <0.0001; EPE 1.2 km.h-1), indicating a greater error (+50%). Data from this study support the use of the estimated VO2Max strategy for treadmill, especially considering the acceptable EPE and appropriate correlation coefficient. One should, however, consider this error of measurement in future applications of the method