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  • Title: Are nutritional supplements a gateway to doping use in competitive team sports? The roles of achievement goals and motivational regulations.
    Author: Barkoukis V, Lazuras L, Ourda D, Tsorbatzoudis H.
    Journal: J Sci Med Sport; 2020 Jun; 23(6):625-632. PubMed ID: 31928883.
    Abstract:
    OBJECTIVES: The study investigated the moderating role of achievement goals and motivation regulations on the association between self-reported nutritional supplement (NS) use, doping likelihood, and self-reported doping behaviour among competitive athletes. METHOD: Four hundred and ninety seven competitive team sport athletes (64% males; M age=23.54 years, SD=5.75) completed anonymous questionnaires measuring self-reported use of prohibited substances and licit NS; beliefs about the "gateway" function of NS; achievement goals; and motivational regulations. RESULTS: Hierarchical linear regression analysis showed that self-reported doping was associated (Adjusted R2=33%) with NS use, a stronger belief that NS use acts as a gateway to doping, amotivation, controlled motivation, mastery approach, and performance avoidance goals. Higher likelihood to use doping substances in the future was associated (Adjusted R2=41.7%) with current NS use, stronger belief that NS act as a gateway to doping, autonomous motivation, and performance avoidance goals. A series of moderated regression analyses showed that NS use significantly interacted with mastery approach, mastery avoidance, performance avoidance goals, autonomous motivation controlled motivation, and with amotivation in predicting self-reported doping. Finally, NS use significantly interacted with mastery approach goals, performance avoidance goals, and controlled motivation in predicting future doping likelihood. CONCLUSIONS: Achievement goals and motivational regulations are differentially associated with both doping likelihood and self-reported doping, and may account for the observed association between self-reported NS use and doping substances; thus, providing an alternative explanation to the "gateway hypothesis" that emphasizes the role of motivation.
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