Larouche R.Abadi M.R.H.Aubert S.Bhawra J.Brazo-Sayavera J.Carson V.Colley R.C.Nyström C.D.Esliger D.W.Harper-Brown R.Alejandra Gonzalez Cifuentes S.Jáuregui A.Katewongsa P.Khadilkar A.Kira G.Kuzik N.Liu Y.Lof M.Loney T.Manyanga T.Mwase-Vuma T.W.Oyeyemi A.L.Reilly J.J.Richards J.Roberts K.Sarmiento O.L.Augusto Santos Silva D.Smith M.Subedi N.Vanderloo L.M.Widyastari D.A.Wilson O.W.A.Wong S.H.Tremblay M.S.Mahidol University2024-08-032024-08-032024-07-24BMJ open Vol.14 No.7 (2024) , e082275https://repository.li.mahidol.ac.th/handle/123456789/100210INTRODUCTION: Global surveillance of physical activity (PA) of children and adolescents with questionnaires is limited by the use of instruments developed in high-income countries (HICs) lacking sociocultural adaptation, especially in low- and middle-income countries (LMICs); under-representation of some PA domains; and omission of active play, an important source of PA. Addressing these limitations would help improve international comparisons, and facilitate the cross-fertilisation of ideas to promote PA. We aim to develop and assess the reliability and validity of the app-based Global Adolescent and Child Physical Activity Questionnaire (GAC-PAQ) among 8-17 years old in 14 LMICs and HICs representing all continents; and generate the 'first available data' on active play in most participating countries. METHODS AND ANALYSIS: Our study involves eight stages: (1) systematic review of psychometric properties of existing PA questionnaires for children and adolescents; (2) development of the GAC-PAQ (first version); (3) content validity assessment with global experts; (4) cognitive interviews with children/adolescents and parents in all 14 countries; (5) development of a revised GAC-PAQ; (6) development and adaptation of the questionnaire app (application); (7) pilot-test of the app-based GAC-PAQ; and, (8) main study with a stratified, sex-balanced and urban/rural-balanced sample of 500 children/adolescents and one of their parents/guardians per country. Participants will complete the GAC-PAQ twice to assess 1-week test-retest reliability and wear an ActiGraph wGT3X-BT accelerometer for 9 days to test concurrent validity. To assess convergent validity, subsamples (50 adolescents/country) will simultaneously complete the PA module from existing international surveys. ETHICS AND DISSEMINATION: Approvals from research ethics boards and relevant organisations will be obtained in all participating countries. We anticipate that the GAC-PAQ will facilitate global surveillance of PA in children/adolescents. Our project includes a robust knowledge translation strategy sensitive to social determinants of health to inform inclusive surveillance and PA interventions globally.MedicineArticleSCOPUS10.1136/bmjopen-2023-0822752-s2.0-851996503262044605539053955