Keating, Xiaofen D.Zhou, KeLiu, XiaoluHodges, MichaelLiu, JingwenGuan, JianminPhelps, AshleyCastro-Piñero, Jose2021-04-192021-04-192019-10-26International Journal of Environmental Research and Public Health 16 (21): 4128 (2019)https://hdl.handle.net/20.500.12588/464This study aimed to systematically review previous studies on the reliability and concurrent validity of the Global Physical Activity Questionnaire (GPAQ). A systematic literature search was conducted (n = 26) using the online EBSCOHost databases, PubMed, Web of Science, and Google Scholar up to September 2019. A previously developed coding sheet was used to collect the data. The Modified Quality Assessment Tool for Observational Cohort and Cross-Sectional Studies was employed to assess risk of bias and study quality. It was found that GPAQ was primarily revalidated in adult populations in Asian and European countries. The sample size ranged from 43 to 2657 with a wide age range (i.e., 15–79 years old). Different populations yielded inconsistent results concerning the reliability and validity of the GPAQ. Short term (i.e., one- to two-week interval) and long-term (i.e., two- to three-month apart) test–retest reliability was good to very good. The concurrent validity using accelerometers, pedometers, and physical activity (PA) log was poor to fair. The GPAQ data and accelerometer/pedometer/PA log data were not compared using the same measurements in some validation studies. Studies with more rigorous research designs are needed before any conclusions concerning the concurrent validity of GPAQ can be reached.Attribution 4.0 United Stateshttps://creativecommons.org/licenses/by/4.0/adult physical activity questionnaireinternational perspectiverevalidationArticle2021-04-19