RT Journal Article T1 Psychometric validation of the Brazilian version of the interpersonal behavior questionnaire in physical education A1 Bordoni Caldeira, Hermê Fellipo A1 Correia Júnior, Jânio Luiz A1 Albuquerque da Costa, Julio Cezar A1 dos Santos Ferreira, Giovana A1 Pereira da Silva, Samara Cecília Sabino A1 Pereira Gonçalves, Marina A1 Burgueño, Rafael A1 Freitas-Dias, Ricardo K1 Ejercicio físico - Estudio y enseñanza AB Grounded on Self-Determination Theory, this study aimed to validate the internal structure and internal consistency of the Brazilian version of the Interpersonal Behavior Questionnaire in Physical Education (IBQ-PE-BRA) among Brazilian adolescents. A total of 500 students (51.2% female), aged 11–17 years (M = 13.82, SD = 1.77), completed the IBQ-PE-BRA. Confirmatory Factor Analysis supported the model’s adequacy, and additional Item Response Theory analyses identified items with insufficient discrimination, indicating a low ability to differentiate between different levels of the construct. The internal consistency measure was satisfactory for the Autonomy-Supportive Behaviors, Competence-Supportive Behaviors, and Relatedness-Supportive Behaviors factors. On the other hand, the three types of need-thwarting behavior obtained unsatisfactory scores. The results of the present study provide important insights for researchers and professionals who intend to use the IBQ-PE-BRA as a tool for assessing students’ perceptions of Physical Education teachers’ behaviors. PB Springer Nature YR 2026 FD 2026-02-24 LK https://hdl.handle.net/10630/45722 UL https://hdl.handle.net/10630/45722 LA eng NO Caldeira, H.F.B., Correia Júnior, J.L., da Costa, J.C.A. et al. Psychometric validation of the Brazilian version of the interpersonal behavior questionnaire in physical education (2026). Current Psycholofy, 45, 578. https://doi.org/10.1007/s12144-026-09055-z NO Finance Code 001 - Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) DS RIUMA. Repositorio Institucional de la Universidad de Málaga RD 26 feb 2026