Abstract: Under 30 % of adolescents achieve the recommended daily physical activity by the World Health Organization. Social cognitive theory by Bandura claims that outcome expectancies influence sport behavior. Therefore, the aim of this study was to develop a questionnaire that captures sports-related expectancies of adolescents, as such questionnaires have been developed for adults only and adults and adolescents may differ in their outcome expectancies. In the first study, 46 adolescents were asked about their expectancies regarding sports with open-ended questions. The answers were used to formulate items of the Exercise-Related Outcome Expectancies Questionnaire for Adolescents (EOEQ-A). In the second study, factor structure and reliability were tested in a sample of 452 10- to 19-year-old adolescents ( M = 15.09, SD = 2.46). Factor analysis suggests four factors: (a) psychological, (b) negative, (c) physical, and (d) social outcome expectancies. In a subsample of competitive athletes, an additional scale with competition-related items was devised. This questionnaire was found to be a reliable method for assessing sports-related outcome expectancies.
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