Regardless of the motor test and the cutoffs used for classification of cardiorespiratory fitness (CRF) in the young it is expected similar estimates. The aim was to investigate the agreement in the classification of the CRF determined from two field trials in adolescents with different weight status. The study included 281 adolescents of bout sex, aged between 11 and 13 years. We obtained anthropometric measurements of body weight and height. The CRF was evaluated by testing: Shuttle-Run 20 meters (SR-20m) and 9-minute run/walk field test (9min). The McNemar test compared the differences of proportions. Kappa statistics verified the strength of agreement. The results show significant differences between the ratios in the classification between the batteries of tests (P<0.001), independent of weight status. Conclude that the use of field tests SR-20m and 9min, and the classifications suggested by their respective batteries, Physical Best and Fitnessgram, to determine the CRF can rank differently the same individuals, regardless of sex and nutritional status. Accordingly, we suggest caution in the choice of the test and its classification to determine the CRF.
Physical fitness; Weight status; Adolescents
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