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According to self-determination theory, when teachers establish an autonomy supportive climate in the classroom, students demonstrate high levels of self-determination and are intrinsically motivated. The aim of this study was to identify factors leading teachers (N=336) to report that they create such a climate. We conducted a path analysis in order to examine the respective roles of teachers' implicit theories, their seniority, and their perceptions of pressures at work. We also attempted to find out whether these personal and contextual variables have a direct influence or are mediated by teachers' self-efficacy. Our first finding was that a theory of academic ability as a fixed trait caused a drop in the teachers' reported support for autonomy. On the other hand, the belief that academic abilities can be improved through students' own efforts indirectly favored an autonomy supportive climate by acting positively on the teachers' self-efficacy. Also, seniority had a significant positive effect on autonomy support that was direct, but was also mediated by self-efficacy. Finally, perceived pressures had a negative impact on reported autonomy support, but their influence was also mediated by self-efficacy.The theory of self-determination is one of the most useful theories for enlightening researchers on motivational processes. One of the main contributions of this theoretical trend

Using self-determination theory (SDT) as an explanatory framework, this randomised-controlled study evaluates the effect of a motivational interviewing (MI)-based intervention as an addition to a standard weight loss programme (SWLP) on physical activity (PA) practice in obese adolescents over a six-month period. Fifty-four obese adolescents (mean age = 13 years, mean BMI = 29.57 kg/m²) were randomly assigned to an SWLP group (n = 28) or SWLP + MI group (n = 26). Both groups received two SWLP sessions, supplemented for the SWLP + MI group, by six MI sessions. Perceived autonomy support, perceived competence, motivational regulations, PA and BMI were assessed at baseline, three and six months (i.e. the end of the programme). MLM analyses revealed that compared to SWLP, the SWLP + MI group had a greater BMI decrease and a greater PA practice increase over time. Moreover, the SWLP + MI group reported greater autonomy support from medical staff at the end of the programme, greater increase in integrated and identified regulations and a stronger decrease in amotivation. MI appears as an efficient counselling method as an addition to an SWLP to promote PA in the context of pediatric obesity.