AIM: The main purpose of this study was to apply a field test to predict the maximal aerobic speed (MAS) of an athlete using the same protocol done in a laboratory. METHODS: Fourteen male subjects volunteered to participate in this study and were evaluated on four separate occasions. First, an anthropometric evaluation was carried out. Secondly, an aerobic test was done on the treadmill with a gass analyzer to measure the maximum oxygen consumption (VO2máx) and to calculate the MAS. Third, Unca test was evaluated again to confirm the reliability of the test. Finally, the participants were evaluated on field using the National University of Catamarca test (UNCa test). RESULTS: The MAS reached on a treadmill 15.6±1.0 km·h-1 was significantly higher than that found during the field test 13,6 ± 1,1 km·h-1 (P=0.0001). However the relationship between the treadmill and the field test were highly correlated in all variables: speed: r=0.83, distance covered r= 0,81, test duration r=0.83. CONCLUSION: If MAS found on a treadmill is considered to be "the gold-standard" to validate MAS on field, it can be said that the UNCa test underestimates speed.
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