CHEN, Y. The Effects of Heart Rate Feedback and Extrinsic Reward on Students’ Activity Level in Elementary Physical Education. International Journal of Physical Education, Fitness and Sports, [S. l.], v. 15, n. 1, p. 61–68, 2026. DOI: 10.54392/ijpefs2615. Disponível em: https://ijpefs.org/index.php/ijpefs/article/view/726. Acesso em: 7 mar. 2026.