American journal of preventive medicine
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Randomized Controlled Trial
Effectiveness of a Just-In-Time Adaptive App to Increase Daily Steps: An RCT.
Addressing the public health problem of physical inactivity, this study evaluates SNapp, a just-in-time adaptive app intervention to promote walking through dynamically tailored coaching content. It assesses SNapp's impact on daily steps and how users' perceptions regarding ease of use and usefulness moderated its effectiveness. ⋯ SNapp increased steps only in users who deemed the app useful, underscoring the importance of user perceptions in app-based interventions.