%0 Journal Article
%@ 1929-0748
%I JMIR Publications
%V 11
%N 9
%P e40908
%T Testing and Optimizing Guided Thinking Tasks to Promote Physical Activity: Protocol for a Randomized Factorial Trial
%A Baldwin,Austin S
%A Lamb,Colin L
%A Geary,Bree A
%A Mitchell,Alexis D
%A Kouros,Chrystyna D
%A Levens,Sara
%A Martin,Laura E
%+ Department of Psychology, Southern Methodist University, P.O. Box 750442, Dallas, TX, 75206, United States, 1 214 768 1027, baldwin@mail.smu.edu
%K physical activity
%K optimization
%K brief intervention
%K episodic future thinking
%K positive affective imagery
%K planning
%K exercise
%D 2022
%7 8.9.2022
%9 Protocol
%J JMIR Res Protoc
%G English
%X Background: Insufficient physical activity is associated with various health risks; however, most current physical activity interventions have critical barriers to scalability. Delivering interventions via technology and identifying active and inert components in early-phase development are ways to build more efficient and scalable interventions. We developed a novel intervention to promote physical activity that targets 3 brief guided thinking tasks, separately and in combination, using brief audio recordings: (1) episodic future thinking (EFT), (2) positive affective imagery (PAI), and (3) planning. Objective: The aim of this GeT (Guided Thinking) Active study is to optimize a scalable guided thinking intervention to promote physical activity using principles of the Multiphase Optimization Strategy (MOST). Mechanism-focused analyses will inform which components are optimal candidates for inclusion in an intervention package and which need refinement. Methods: We will enroll 192 participants randomized to receive intervention components delivered via an audio recording that they will listen to prior to weekly in-lab physical activity sessions. Participants in the high dose conditions will also be instructed to listen to the audio recording 4 additional days each week. We will evaluate effects of the components on physical activity over 6 weeks in a 2 (EFT vs recent thinking) × 2 (PAI vs neutral imagery) × 2 (planning vs no planning) × 2 (dose: 5×/week vs 1×/week) full factorial randomized trial. Results: The National Cancer Institute funded this study (R21CA260360) on May 13, 2021. Participant recruitment began in February 2022. Data analysis will begin after the completion of data collection. Conclusions: The GeT Active study will result in a scalable, audio-recorded intervention that will accelerate progress toward the full development of guided thinking interventions to promote physical activity. Trial Registration: ClinicalTrials.gov NCT05235360; https://clinicaltrials.gov/ct2/show/NCT05235360 International Registered Report Identifier (IRRID): DERR1-10.2196/40908 
%M 36074550
%R 10.2196/40908
%U https://www.researchprotocols.org/2022/9/e40908
%U https://doi.org/10.2196/40908
%U http://www.ncbi.nlm.nih.gov/pubmed/36074550