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DOI: 10.1177/1359105306058847 Autonomy and ControlAugmenting the Validity of the Theory of Planned Behaviour in Predicting ExerciseBack in Motion Rehabilitation, Canada, traceyb{at}backinmotion.com
University of Exeter, UK
University of Southern Queensland, Australia This study examined the utility of the theory of planned behaviour (TPB) along with additional constructs in predicting exercise, and explored the motivational antecedents of exercise intentions. Participants included 162 Canadian University College students (61% females). Measures of TPB, autonomous and controlling intention, perceived autonomy support and core autonomous intention were completed during phase 1 of data collection. Two and three weeks later behaviour was assessed. Hierarchical regression analyses revealed that: (a) attitude and perceived behavioural control significantly predicted TPB intention and core autonomous intention; (b) subjective norm predicted controlling intention; and (c) perceived autonomy support predicted autonomous and core autonomous intention. TPB intention significantly predicted behaviour. TPB is a fairly useful model for predicting behaviour and important information can be gained when other measures of intention are explored.
Key Words: autonomous social influence motivation self-determination
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