ObjectivesThe first statement was to determine the amount of physical activity expressed in expenditure weightedaverage day of a year (DEEmY) energy during the school year and holidays (kJ.kg-1.day-1) in terms ofequivalence caloric and metabolic cost of activities most commonly performed by young people. Thesecond statement was that of defining the relationship between the DEEmY vs age, gender,socioeconomic level (SEL), height, body weight, body surface (BS), the Body Mass Index (BMI),biological age (Tanner), body composition, somatotype and fitness (EUROFIT).MethodsThis descriptive study developed five different phases: the first phase: it was the training of researchers,the second phase: understanding and final questionnaire editing QAPACE, in the third phase: feasibilityand reproducibility of QAPACE in the fourth stage: it was the validation study by direct VO2max (36subjects) by ergospirometry and indirect through the test Leger and the fifth phase cycle was developedin 1840 with the general study subjects. The questionnaire was developed by 13 categories. Forreproducibility and validation of the test-Retest method and comparison of arithmetic by the method ofBland-Altman, Pearson correlation was applied. The data is stored in Visual Fox Pro 6.0 and analyzedusing SPSS 21 statistical program IBM. Means were compared using multivariate linear model applyingtipe II.The values used as fixed variables: gender (male and female), age (8-16 years) and three SEL (six strata:1-2, 3-4 and 5-6); as dependent variables were evaluated: height, weight, leisure time, expressed inhours/day and daily energy expenditure DEE (Kj.kg-1.day-1) during leisure time (DEE-LT) during thetime school (DEE-ST) during the holidays (DEE-VT), and DEE total mean year (DEEmTY).For a post-Hoc analysis was used the minimum significant difference (MSD) with fixed factors,interaction factors descriptive statistics, tests of homogeneity with a significance level of 0.05.ResultsThe questionnaire was correct understanding of the reproducibility intra-Class correlation was r = 0.96(CI 0.95-0.97), the validity of the direct and indirect VO2 was 0.76 (0.66) (p