title: Extending the theory of planned behavior: the role of self and social influences in predicting adolescent regular moderate-to-vigorous physical activity.
abstract: The current study aimed to test the validity of an extended theory of planned behavior model (TPB; Ajzen, 1991), incorporating additional self and social influences, for predicting adolescent moderate-to-vigorous physical activity. Participants (N = 423) completed an initial questionnaire that assessed the standard TPB constructs of attitude, subjective norm, and perceived behavioral control, as well as past behavior, self-identity, and the additional social influence variables of group norms, family social support, friends' social support, and social provisions. One week after completion of the main questionnaire, participants completed a follow-up questionnaire that assessed self-reported physical activity during the previous week. The standard TPB variable--past behavior, self-identity, and group norms, but not social support influences--predicted intentions, with intention, past behavior, and self-identity predicting behavior. Overall, the results provide support for an extended version of the TPB incorporating self-identity and those social influences linked explicitly to membership of a behaviorally relevant reference group.
authors: School of Psychology and Counselling, Queensland University of Technology, Bresbane, Queensland Australia.
authors: Kyra
authors: K
authors: Hamilton
authors: Katherine M
authors: KM
authors: White
mesh_terms: D000293:Adolescent; D002648:Child; D015444:Exercise / Q000523:psychology*; D005190:Family / Q000523:psychology; D005260:Female; D005500:Follow-Up Studies; D033062:Friends / Q000523:psychology; D007722:Health Knowledge, Attitudes, Practice; D006306:Health Surveys; D006801:Humans; D033182:Intention; D007389:Internal-External Control; D008297:Male; D000297:Psychology, Adolescent; D011793:Queensland; D020377:Self Efficacy; D012932:Social Facilitation; D012944:Social Support; D011795:Surveys and Questionnaires