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Health Education Research Advance Access published online on March 14, 2008
Health Education Research, doi:10.1093/her/cyn005
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© The Author 2008. Published by Oxford University Press. All rights reserved. For permissions, please email: journals.permissions@oxfordjournals.org

Predicting changes in physical activity among adolescents: the role of self-efficacy, intention, action planning and coping planning

Vera Araújo-Soares1,2,*, Teresa McIntyre3 and Falko F. Sniehotta4

1 Faculty of Health and Social Care, The Robert Gordon University, Garthdee Road, Aberdeen, AB10 7QG, Scotland, UK
2 The Alliance for Self Care Research, Scotland, UK
3 University of Minho, Minho, Portugal
4 University of Aberdeen, Scotland, UK

Correspondence to: * Correspondence to: V. Araújo-Soares. E-mail: v.l.b.araujo-soares{at}rgu.ac.uk

This paper aims to test the direct predictors of the theory of planned behaviour (TPB), action planning and coping planning as predictors of changes in physical activity (PA) in 157 adolescents (mean age: 12). TPB measures, the Action Planning and Coping Planning Scales (APCPS) and the International Physical Activity Questionnaires were measured at baseline, 2- and 5-month follow-up. Hierarchical regression analyses were conducted regressing PA at Time 2 or Time 3 onto TPB and APCPS at baseline or Time 2, respectively. Past behaviour accounted for a significant 25–51% of the variance in PA in Step 1 of all three analyses. In Step 2, TPB accounted for an additional 3–10% with intention as a significant predictor. While no main effects for action planning or coping planning (Step 3) were found, all three analyses resulted in a significant amount of incremental variance accounted for by the interaction of action planning and coping planning (Step 4). Results suggest that the combination of high levels of action planning and coping planning is associated with increases in PA. Implications for theory of behaviour change in adolescents are discussed.

Received on April 6, 2007; accepted on January 3, 2008


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