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OBJECTIVE: Do post-program motivational regulations mediate the intervention effect of the SDT-based European Fans in Training (EuroFIT) program on self-esteem, well-being and vitality at 12-months follow-up? METHODS: A causal mediation analysis of data from the randomised controlled trial of the EuroFIT program that recruited 1113 overweight, male football fans in England, Norway, Portugal and the Netherlands. RESULTS: <.001), but not controlled motivation, at 12-months follow-up in the EuroFIT trial. We also found that reductions in amotivation at post-program partly explained positive increases across outcomes at 12-months follow-up. When controlling for increases in outcome variables at post-program, only the mediating effect of autonomous motivation on self-esteem remained significant, whereas the indirect pathway through reductions in amotivation remained significant for all outcomes. None of the indirect effects were robust to potential mediator-outcome confounding. CONCLUSION: EuroFIT program produced small-to-moderate improvements in vitality, well-being, and self-esteem at 12-month follow-up that were partly explained by post-program increases in autonomous motivation and reductions in amotivation. All indirect effects estimates were sensitive to potential mediator-outcome confounding.
Røynesdal et al. (Mon,) studied this question.