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This study was conducted to correlate and compare values for variables determined in indirect tests with the values determined directly in youth soccer players. The study subjects were 27 youth soccer players (age 16.77 ± 0.75 years; body mass 63.29 ± 7.37 kg; body height 174.14 ± 8.46 cm) playing in the basic categories of a first division team at the regional level of Brazilian soccer. Each subject was evaluated with the following tests: a) a treadmill test to directly determine values of VO 2max and Va max (Treadmill); b) an indirect Shuttle Run Test (SRT); c) an indirect Carminatti's test (TCar). VO 2max showed significantly different values in the Treadmill and the SRT (59.21 ± 5.88 and 50.67 ± 3.58 ml⋅kg -1 ⋅min -1 , respectively). Similarly, values obtained for V Peak in the treadmill test and for Va max in TCar were different from values for SRT V Peak (15.01 ± 1.10, 14.92 ± 0.87 and 12.64 ± 0.62 km⋅h -1 , respectively). A correlation analysis showed a moderate relationship between values for V Peak TCar and VO 2max determined on a treadmill (r = 0.46) and Va max determined on a treadmill (r = 0.54). The analysis also showed a high correlation between values of VO 2max determined on the treadmill and VO 2max evaluated in the SRT (r = 0.69), as well as V Peak determined in the SRT and VO 2max tested on the treadmill (r = 0.71), as well as between V Peak determined in the SRT and VO 2max evaluated on the treadmill (r = 0.77). We concluded that the SRT underestimated values of VO 2max and Va max . Additionally, V Peak TCar showed no difference compared to Va max , although it did show a low correlation with it. In addition the SRT, even with high correlations, did not seem to be a great predictor of aerobic fitness in youth soccer players.

Determination of Aerobic Performance in Youth Soccer Players: Effect of Direct And Indirect Methods