Why are children different in their moderate-to-vigorous physical activity levels? A multilevel analysis Sara Pereira; Ana Reyes; Marcos A. Moura-Dos-Santos; Carla Santos; Thayse N. Gomes; Go Tani; Olga Vasconcelos; Tiago V. Barreira; Peter T. Katzmarzyk; José Maia;

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;