Main Article Content
Using self-determination theory, we examined the mechanism of motivation in the context of physical activity (PA). We conducted structural equation modeling with 431 participants. The results showed general support for the motivational process model, in which a sequence is specified from autonomy support and causality orientations to psychological need satisfaction to self-determined behavioral regulation to PA behavior. These findings aid understanding of the underlying motivational mechanism of PA behavior, and highlight the positive roles of autonomy support and autonomy orientation in psychological need satisfaction, self-determined behavioral regulation, and PA participation.