Authors
Predrag Klasnja, Shawna Smith, Nicholas J Seewald, Andy Lee, Kelly Hall, Brook Luers, Eric B Hekler, Susan A Murphy
Publication date
2019/6
Journal
Annals of Behavioral Medicine
Volume
53
Issue
6
Pages
573-582
Publisher
Oxford University Press
Description
Background
HeartSteps is an mHealth intervention that encourages regular walking via activity suggestions tailored to the individuals’ current context.
Purpose
We conducted a micro-randomized trial (MRT) to evaluate the efficacy of HeartSteps’ activity suggestions to optimize the intervention.
Methods
We conducted a 6-week MRT with 44 adults. Contextually tailored suggestions could be delivered up to five times per day at user-selected times. At each of these five times, for each participant on each day of the study, HeartSteps randomized whether to provide an activity suggestion, and, if so, whether to provide a walking or an antisedentary suggestion. We used a centered and weighted least squares method to analyze the effect of suggestions on the 30-min step count following suggestion randomization.
Results
Averaging over study …
Scholar articles
P Klasnja, S Smith, NJ Seewald, A Lee, K Hall, B Luers… - Annals of Behavioral Medicine, 2019
