The aim of this study is to establish the concordance between direct and indirectmeasurements of VO2max in laboratory and field tests. Methods: Fourteen National-level, under 20 years old (U20) soccer players participated in the study. The physical characteristic are (mean±sd): age 18.4±1 years old and body mass, 72.4±4.2 kg and height, 180±7 cm. Laboratory test was performed in treadmill, running to exhaustion. The field test was performed a week later, the Yo-Yo intermittent recovery 1 test (YYIR1), consist of 2×20m shuttle runs at increasing speeds, interspersed with a 10-second period of active recovery. Both test were equipped with an ambulatory gas exchange measurement device and a short rate telemetry heart rate monitor.Results: The concordance correlation coefficient between maximal heart rate (HRmax) achieved in treadmill and HRmax in YYIR1=0.357; for direct VO2max in treadmill and direct VO2max in YYIR1=0.638; estimate VO2max in treadmill and estimated VO2max in YYIR1=0.142; estimated VO2max and direct VO2max in treadmill=0.229; estimated VO2max in YYIR1 and direct VO2max in YYIR1=0.283. Conclusions: The results suggest that there is no concordance between direct and indirect measurements of VO2max and HRmax in treadmill and YYIR1 test. Soit could be concluded that both, the treadmill protocol and YYIR1 test, are not good predictors of indirect VO2max and HRmax achieved in those test, therefore can not be applied between them.
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