Silva, J.K.T. do N.F. da, Lins Filho, O. de L., Germano-Soares, A.H., Ritti-Dias, R.M. and Farah, B.Q. 2022. Association between frequency of physical education classes and heart rate variability in adolescents boys: a cross-sectional study. Journal of Physical Education . 33, 1 (Apr. 2022), e-3322. DOI:https://doi.org/10.4025/jphyseduc.v33i1.3322.