Advancing Understanding of Just-in-Time States for Supporting Physical Activity (Project JustWalk JITAI): Protocol for a System ID Study of Just-in-Time Adaptive Interventions

Junghwan Park   ^{1, 2, 3, 4} , BS ;   Meelim Kim   ^{1, 2, 3, 5} , PhD ;   Mohamed El Mistiri   ⁶ , MS ;   Rachael Kha   ⁷ , MS ;   Sarasij Banerjee   ⁶ , BTECH ;   Lisa Gotzian   ⁸ , MS ;   Guillaume Chevance   ⁹ , PhD ;   Daniel E Rivera   ⁶ , PhD ;   Predrag Klasnja   ¹⁰ , PhD ;   Eric Hekler   ^{1, 2, 3} , PhD

¹ Herbert Wertheim School of Public Health and Human Longevity Science, University of California, San Diego, La Jolla, CA, United States

² Center for Wireless & Population Health Systems, Calit2’s Qualcomm Institute, University of California, San Diego, La Jolla, CA, United States

³ The Design Lab, University of California, San Diego, La Jolla, CA, United States

⁴ Ministry of Health and Welfare, Korean National Government, Sejong, Republic of Korea

⁵ Department of Preventive Medicine, College of Medicine, Yonsei University, Seoul, Republic of Korea

⁶ Control Systems Engineering Laboratory, School for Engineering of Matter, Transport, and Energy, Arizona State University, Tempe, AZ, United States

⁷ Institute for Data, Systems, and Society, Massachusetts Institute of Technology, Cambridge, MA, United States

⁸ Lufthansa Industry Solutions, Lufthansa, Norderstedt, Germany

⁹ ISGlobal, Barcelona, Spain

¹⁰ School of Information, University of Michigan, Ann Arbor, MI, United States