Résumé
Objective: Both explicit and implicit motivational processes predict physical activity (PA); however, their respective contributions may depend on interindividual differences. This study examined the moderating role of trait impulsivity and executive functions in the associations between PA intentions, implicit attitudes toward sedentary behavior, and PA measured with accelerometers in persons with obesity. Methods: Participants (N = 76; Mage = 56 years, SD = 11.9; MBody Mass Index = 39.1, SD = 6.5) completed baseline questionnaires measuring their PA intentions and trait impulsivity. They also performed 2 computerized tests measuring implicit attitudes toward sedentary behavior and executive functions. PA was assessed 4 months later with an accelerometer. Results: Implicit attitudes toward sedentary behavior and executive functions interacted to predict PA. Higher implicit attitudes were associated with significantly lower PA in participants with low and moderate executive functions but not high executive functions. Conclusions: These results support the role of implicit processes and cognitive factors in health-related behavior adoption through time. Practically, these variables may be useful to identify individuals at risk of abandoning PA after programs who thus may benefit from complementary interventions (e.g., provide feedback on implicit attitudes and develop self-regulatory skills)