Association between physical education classes and physical activity among 187,386 adolescents aged 13¿17 years from 50 low- and middle-income countries Xuzhi Zhan; Cain C.T. Clark; Ran Bao; Micheal Duncan; Jin-Tao Hong; Si-Tong Chen;

Are there differences in the physical activity level and functional capacity among children and adolescents with and without asthma? Lívea Gianfrancesco; Ana Paula Gaban Malheiro; Natasha Yumi Matsunaga; Marina Simões Oliveira; Milena Baptistella Grotta; André Moreno Morcillo; José Dirceu Ribeiro; Adyléia Aparecida Dalbo Contrera Toro;

Low back pain in adolescents and association with sociodemographic factors, electronic devices, physical activity and mental health Thiago Paulo Frascareli Bento; Guilherme Porfirio Cornelio; Priscila de Oliveira Perrucini; Sandra Fiorelli Almeida Penteado Simeão; Marta Helena Souza de Conti; Alberto de Vitta;