Injunctive norms as social pressures: Does autonomy support moderate the relationship between injunctive norms and autonomy satisfaction in physical activity?

 Despite the usefulness of social norms for changing behaviour, injunctive norms (i.e., perceptions of what others approve) from significant others tend to be a weak predictor of physical activity (PA) engagement. A potential explanation is that injunctive norms encompass pressuring social influence that undermines autonomous PA engagement. This study examined whether injunctive norms from significant others undermine individuals' autonomy satisfaction during the pursuit of PA engagement, and whether this effect is moderated by the degree to which significant others offer concurrent autonomy support. Online questionnaires.  Participants' perceptions of injunctive norms and autonomy support from significant others, autonomy satisfaction, behaviour regulation, PA intentions, and weekly PA frequency were assessed at baseline ( = 497) and after two weeks ( = 351). : Autonomy support positively related to autonomy satisfaction, whereas injunctive norms were negatively related to autonomy satisfaction. Though the statistical significance of interaction effects was inconsistent across results, simple slopes suggested that the negative relationship between injunctive norms and autonomy satisfaction was attenuated at higher levels of autonomy support in models focusing on influence from parents and friends. When promoting others' PA, communicating direct social expectations/pressures may be ineffective.