Effectiveness of an Online Computer-tailored, Pedometer-based Physical Activity Intervention: a Cluster- Randomized Controlled Trial

Abstract

Background: To test the effects of an online-tailored step advice, based on the Theory of Planned Behavior and the Transtheoretical Model, in adults. Methods: A cluster-randomized controlled trial was conducted among 274 participants recruited from eight Flemish workplaces. Intervention participants received an Internet link to request the online-tailored step advice. Self-reported (IPAQ) and pedometer-based physical activity (PA) were assessed at baseline (T0), and one (T1) and three (T2) months post baseline. Repeated measures ANCOVA’s were used to examine intervention effects for both the total sample and the sample at risk. Findings: Between T0 and T1, significant intervention effects were found for step counts in the total sample (p = .004), and the at-risk sample (p = .001), and for time spent walking in the at-risk sample (p = .02). Between T0 and T2, intervention effects were still significant for step counts in the total sample (p = .03) and the at-risk sample (p = .02); however, self-reported PA differences were no longer significant. Discussion: The online-tailored step advice has the potential to enhance daily step counts, as well as time spent walking in adults.