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La recherche de prise de masse musculaire et les troubles du comportement alimentaire chez les sportifs masculins : application du modèle trans-contextuel de la motivation

Abstract : Although the drive for muscularity was related to some deviant behaviors such as eating disorders, the underlying types of motivation and socio-cognitive variables are only scarcely identified to date. The main goal of this thesis was to apply the trans-contextual model of motivation (Hagger & Chatzisarantis, 2009), integrating the theory of self-determination (Deci & Ryan, 2000) and the theory of planned behavior (Ajzen & Madden, 1986), to show the motivational sequence underlying the drive for muscularity behaviors among male bodybuilders and the eating behaviors in male athletes practicing at risk sports such as bodybuilding and running. Five studies comprise this dissertation. Study 1 presented a literature review of the drive for muscularity and muscle dysmorphia among bodybuilders. The purpose of the study 2 was to develop and validate a questionnaire (DMS-FR) to measure the drive for muscularity among French-speaking male athletes. Studies 3 and 4 applied the trans-contextual model of motivation in the drive for muscularity behaviors context among male bodybuilders, and in the eating behaviors context among male athletes practicing at risk sports (i.e., bodybuilding vs running). Study 5 qualitatively explored other psychosocial factors that may explain the development dynamics of eating disorders, according to the competitive level of the bodybuilders. The main results showed that different types of motivation (i.e., auto-determined and controlled) were positively related to drive for muscularity behaviors among male bodybuilders and to eating behaviors among male bodybuilders and runners, both directly and through the socio-cognitive variables of the theory of planned behavior. This thesis defends the importance of studying the psychosocial mechanisms which could explain deviant eating behaviors among male bodybuilders in the perspective of developing preventive tools.
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Lisa Chaba. La recherche de prise de masse musculaire et les troubles du comportement alimentaire chez les sportifs masculins : application du modèle trans-contextuel de la motivation. Education. COMUE Université Côte d'Azur (2015 - 2019), 2019. Français. ⟨NNT : 2019AZUR4107⟩. ⟨tel-02884756⟩

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