Utilização de protocolos diretos e indiretos na avaliação do consumo máximo de oxigênio de atletas de futebol.

Abstract

The cardiorespiratory fitness is emphasized on soccer physical trainings, being the maximal oxygen uptake (VO2 max) is one of the main parameters analyzed. Its measurement may be done through direct (DP) or indirect protocols (IP), which present advantages and disadvantages. Objective: To verify if there is a relation between direct and indirect the measurements, as well as to define variation percentages of predictive equations of VO2 max in an indirect way by submaximal and maximal exercise tests compared to VO2 max obtained through a direct way. Methods: The present cross-sectional study of correlational nature evaluated 50 male soccer players, aged 17-34, who performed previously an anthropometric assessment. The subjects were submitted to an ergoespirometric test, with Maximum Bruce Protocol. The indirect estimate was performed by the Bruce, Kusumi and Hosmer´s maximal exercise test as well as Ross and Jackson´s submaximal test equation. The data analysis was performed through the program SPSS, version 23.0. Results: In general, an association between VO2max values was found obtained by DP and IP on maximal (M) and submaximal (S) exercise tests (M: r= 0,439; p<0,01; S: r=0,358; p<0,05), as well as by position, to left and right-backs (M: r=0,761; p<0,05; S: r=0,738; p<0,05) and forwards (M: r=0,778; p<0,05; S: r=0,733; <0,05). In contrast, the results by IP on maximal exercise tests overestimated 11,24% of the values obtained by DP, whereas those by IP on submaximal exercise tests underestimated 32,91%. Conclusion: Indirect assessments of maximal and submaximal exercise tests did not present significant differences to DP, being observed a better relation of the maximal exercise tests protocol and the DP, when compared to the submaximal exercise tests protocol.