Mayorga Aguilar, L., Martínez-Salazar, C. and Carcamo-Oyarzun, J. 2021. Perception of Effort and Objective Levels of Intensity in Physical Education Classes of Primary Schoolchildren According to Gender and Nutritional Status: A Pilot Study. MHSalud: Revista en Ciencias del Movimiento Humano y Salud. 19, 1 (Dec. 2021), 1-11. DOI:https://doi.org/10.15359/mhs.19-1.8.