Chen, YuChun. “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 15, no. 1 (February 11, 2026): 61–68. Accessed March 7, 2026. https://www.ijpefs.org/index.php/ijpefs/article/view/726.