The influence of perceived loci of control and causality in the Theory of Planned Behavior in a leisure-time exercise context

The contribution that generalized locus of control and perceived locus of causality made to adolescents ’ intentions to participate in leisure-time physical activity was examined. A mediational model included constructs from three theoretical approaches: locus of control, self-determination theory (SDT), and the theory of planned behavior. A structural equa-tion model revealed that the effects of generalized locus of control on attitudes, subjective norms, and intentions to participate in physical activity were mediated by intrinsic motives from SDT. Findings provide evidence in support of a motivational sequence in which locus of control influences situation-specific attitudes, subjective norms, and intentions mediated by the context-specific motives from SDT. A key aim in the behavioral sciences is to understand the mechanisms behind individuals ’ motivation to participate in health behaviors (Godin & Kok, 1996). This goal is important in a physical activity context in light of research support-ing the physiological and psychological benefits of regular exercise in adults (Williams, 2001) and young people (Gutin & Owens, 1996; Sallis & Patrick, 1994). As a result, social psychologists have applied theoretical approaches to the study of people’s motivation to participate in physical activity (Brawley, 1993). Their focus has been on the identification of the key psychological antecedents of physical activity behavior so that their findings can be used as a basis for effec-tive campaigns and strategies to promote a more active lifestyle. 1Correspondence concerning this article should be addressed to Martin Hagger, Department o