Computer tailoring intervention to enhance physical activity: effects of different theoretical approaches

Abstract

OBJECTIVE. Computer tailoring (CT) modifies an intervention to the specific personal characteristics, needs and preferences of the individual user. However, the way CT is theoretically embedded varies substantially, possibly resulting in different effects or behavioral change processes. METHODS. Two online CT interventions targeted at increasing physical activity (PA) are presented. ActivePlus, targeting older adults, is based on theories as SCT, TPB and Self-Regulation Theory. I Move, aimed at adults, is based on Self Determination Theory, Self-Regulation Theory, and integrates Motivational Interviewing techniques in online CT. In a RCT we compared the more traditional online ActivePlus to I Move, to test differences in PA effects and behavioral change processes. FINDINGS. Both ActivePlus and I Move were effective 6 and 12 months after baseline compared to a control group. The differences in effects, as well in the behavioral change processes of both CT interventions, will be presented. DISCUSSION. CT is potentially effective in increasing PA. However, different approaches can lead to differences in effects as well as in behavioral change processes. mHealth applications might further enhance these effects.