Cardiorespiratory fitness (CRF)To evaluate the CRF from the maximal oxygen uptake (VO2max),we opted for the 20-m shuttle run test, according to what Légeret al.8determine. This test was chosen because of its afford-able implementation and compliance with the motor tests relatedto health contained in the Fitnessgram®battery, created by theCooper Institute for Aerobics Research9and because of its reli-ability and validity on children and adolescents has been widelydocumented.8,10,11VO2max was calculated by the following equa-tion, that covers the age range of this study. An r value of 0.71 wasobtained: