Hellín-Martínez M, García-Jiménez JV, García-Pellicer JJ, Alfonso-Asencio M. Frecuencia cardiaca y niveles de actividad física durante recreos escolares. Un estudio descriptivo (Heart rate and physical activity levels during school recess. A descriptive study). Retos [Internet]. 2022 Jan. 6 [cited 2025 Dec. 8];43:422-7. Available from: http://revistaretos.org/index.php/retos/article/view/88648