Abstract
The objective of this study is to examine how motivation is structured and computed according to Deci and Ryan's (1985, 1991) self-determination continuum hypothesis. To reach this end, data gathered with the help of the Behavioral Regulation in Exercise Questionnaire-2 (Markland & Tobin, 2004) was analyzed using smallest space analyses (SSA). Results indicate the presence of a simplex pattern suggesting that one dimension (i.e., self-determination continuum) seems to underlie the motivations postulated by SDT in the exercise domain. However, results from a two-dimensional SSA show that a duplex is also present within the BREQ-2. Finally, results indicate that the weighting system used by SDT researchers may be slightly underestimating relationships between exercise motivation and some of its correlates. Results are discussed with respect to various theoretical, conceptual, and methodological considerations when measuring motivation in sport/exercise.
