Is physical activity associated with resting heart rate in boys and girls? A representative study controlled for confounders Edner F. Zanuto; Raphael M. Ritti¿Dias; William R. Tebar; Catarina C. Scarabottolo; Leandro D. Delfino; Juliano Casonatto; Luiz Carlos M. Vanderlei; Diego Giulliano Destro Christofaro;