Evaluation of Motivationally Tailored vs. Standard Self-Help Physical Activity Interventions at the Workplace

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Abstract
Purpose.: This study compares the efficacy of a self-help intervention tailored to the individual's stage of motivational readiness for exercise adoption with a standard self-help exercise promotion intervention. Design.: Interventions were delivered at baseline and 1 month; assessments were collected at baseline and 3 months. Setting.: Eleven worksites participating in the Working Healthy Research Trial. Subjects.: Participants (n = 1559) were a subsample of employees at participating worksites, individually randomized to one of two treatment conditions. Intervention.: Printed self-help exercise promotion materials either (1) matched to the individual's stage of motivational readiness for exercise adoption (motivationally tailored), or (2) standard materials (standard). Measures.: Measures of stage of motivational readiness for exercise and items from the 7-Day Physical Activity Recall. Results.: Among intervention completers (n = 903), chi-square analyses showed that, compared to the standard intervention, those receiving the motivationally tailored intervention were significantly more likely to show increases (37% vs. 27%) and less likely to show either no change (52% vs. 58%) or regression (11% vs. 15%) in stage of motivational readiness. Multivariate analyses of variance showed that changes in stage of motivational readiness were significantly associated with changes in self-reported time spent in exercise. Conclusions.: This is the first prospective, randomized, controlled trial demonstrating the efficacy of a brief motivationally tailored intervention compared to a standard self-help intervention for exercise adoption. These findings appear to support treatment approaches that tailor interventions to the individual's stage of motivational readiness for exercise adoption.