- Protection motivation theory and the prediction of physical activity among adults with type 1 or type 2 diabetes in a large population sample
- Plotnikoff, Ronald C.; Lippke, Sonia; Trinh, Linda; Courneya, Kerry S.; Birkett, Nick; Sigal, Ronald J.
- British Journal of Health Psychology Vol. 15, Issue 3, p. 643-661
- Publisher Link
- John Wiley & Sons
- Resource Type
- journal article
- Objectives: To investigate the utility of the protection motivation theory (PMT) for explaining physical activity (PA) in an adult population with type 1 diabetes (T1D) and type 2 diabetes (T2D). Design: Cross-sectional and 6-month longitudinal analysis using PMT. Methods: Two thousand three hundred and eleven individuals with T1D (N =697) and T2D (N =1,614) completed self-report PMT constructs of vulnerability, severity, response efficacy, self-efficacy, and intention, and PA behaviour at baseline and 6-month follow-up. Multi-group structural equation modelling was conducted to: (1) test the fit of the PMT structure; (2) determine the similarities and differences in the PMT structure between the two types of diabetes; and (3) examine the explained variance and compare the strength of association of the PMT constructs in predicting PA intention and behaviour. Results: The findings provide evidence for the utility of the PMT in both diabetes samples (χ²/df = 1.27 − 4.08, RMSEA = .02–.05). Self-efficacy was a stronger predictor of intention (β = 0.64–0.68) than response efficacy (β = 0.14–0.16) in individuals with T1D or T2D. Severity was significantly related to intention (β = 0.06) in T2D individuals only, whereas vulnerability was not significantly related to intention or PA behaviour. Self-efficacy (β's = 0.20–0.28) and intention (β's = 0.12–0.30) were significantly associated with PA behaviour. Conclusions: Promotion of PA behaviour should primarily target self-efficacy to form intentions and to change behaviour. In addition, for individuals with T2D, severity information should be incorporated into PA intervention materials in this population.
- protection motivation theory; physical activity; diabetes; self-efficacy
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