This research analyzed the psychometric properties of the Portuguese language version of the Sport Motivation Scale-II (SMS-II) among Brazilian youth team sport participants. Phase 1 included 590 sport participants (Mage = 14.92 years; SD = 1.68). Within this study, of the six models tested, only the six-factor and five-factor models (without the introjected regulation subscale) showed acceptable fit indices. Further, the intercorrelations between subscales supported the idea of a simplex-like pattern within the SMS-II. Phase 2 included 173 sport participants (Mage = 12.96; SD = 0.91) who completed the SMS-II and Passion Scale. This study provided validity evidence based on the relationship with external measures, showing higher correlations between more self-determined forms of motivation and harmonious passion and between less self-determined forms of motivation and obsessive passion. Across Phases 1 and 2, some issues with the internal reliability of the SMS-II subscales were identified. Overall, our findings indicated the further refinement of the SMS-II.
Júnior et al. (Tue,) studied this question.