Cicchella A. Sport participation, spontaneous physical activity and sleep in 11-13 years old children. J. Hum. Sport Exerc. [Internet]. 2018 Jul. 18 [cited 2024 May 15];13(2proc):S253-S258. Available from: https://www.jhse.ua.es/article/view/2018-v13-n2-proc-sport-participation-spontaneous-physical-activi