Title page for ETD etd-05032004-153016

Type of Document Dissertation
Author Williams, David Michael
Author's Email Address David_M_Williams@Brown.edu
URN etd-05032004-153016
Title Multi-Phase Mediator Analysis of a Social Cognitive Church-Based Physical Activity Intervention
Degree PhD
Department Psychology
Advisory Committee
Advisor Name Title
Anderson, Eileen S. Committee Co-Chair
Winett, Richard A. Committee Co-Chair
Cooper, Lee D. Committee Member
Stephens, Robert S. Committee Member
Wojcik, Janet R. Committee Member
  • Social Cognitive Theory
  • Maintenance
  • Mediators
  • Physical Activity
Date of Defense 2004-04-23
Availability unrestricted
This study tested an integrated social cognitive model of physical activity intention formation, onset, and maintenance among sedentary participants (N = 465) in a church-based, social cognitive, physical activity intervention. Three separate models were tested via structural equation modeling. Each model provided a good fit to the data. The models explained 28%, 19%, and 9% of the variance in intention formation, physical activity onset, and physical activity maintenance, respectively. Consistent with hypotheses, self-efficacy mediated the effect of positive outcome expectancy on behavioral intention, adoption of behavioral strategies mediated the effect of the intervention on physical activity onset, and maintenance of self-efficacy mediated the effect of the intervention on physical activity maintenance. Contrary to hypotheses, change in self-efficacy from baseline to post-assessment and perceived satisfaction with intervention outcomes did not have effects on physical activity onset or maintenance. The findings provide preliminary evidence that physical activity intention formation, onset, and maintenance are distinct processes driven by different determinants before, during, and following a social cognitive physical activity intervention.
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