Implementation and evaluation of a health promotion program in sport clubs: "Promoting Adolescent Physical Activity" The benefits of sport participation have been demonstrated (OMS, 1995). Despite this statement, not all participants have a positive sport experience. To foster this type of experience, this doctoral thesis is composed of three aims : (1) an analysis of sport clubs contribution to health promotion (HP), (2) the evaluation of the effects and (3) process of an intervention based on self-determination and achievement goal theories to foster positive and long term sport involvement: the “Promoting Adolescent Physical Activity” intervention. Two studies have been realised to better understand the role sport clubs can play to HP. The first analyse the representation of sport clubs HP actions and mission of 125 grassroots coaches, underlining that sport clubs could be more active concerning HP policies and practices. The second question the contribution of sport participation to help 331 youth football players to reach WHO's physical activity (PA) recommendations (2010), showing that sport participation might favour participants' PA. The effects of the intervention have been evaluated trough a cluster-randomised trial including 617 players (339 in the experimental group and 278 in the control group). Results have shown that in comparison to the control group, players in the experimental condition have a more positive evolution of their motivational climate, the satisfaction of their competence need, a self-determination index (SDI) and self-esteem, as well as a decrease of their dropout intentions and behaviours. Controlling for Time 1, the intervention has an effect on sport experience fully mediated by the climate, which is partially mediated by basic needs satisfaction and a SDI. The process evaluation has shown that coach expert training to deliver our intervention was effective, that the intervention has no effect at the organisational level, but a correct implementation score. The individual implementation score is moderate.
