Random Assignment of Intervention Messages for Developing Personalized Decision Rules to Promote Physical Activity

Our goal is to develop personalized decision rules for selecting the frequency, timing, and content of messages to promote physical activity. The objective of this project is to develop personalized dynamical models of physical activity (PA) under different weather and temporal conditions as well as in response to different types of intervention messages. This approach relies on having extensive observations within the person under varying conditions to develop a dynamical model of how different conditions interact with each other to predict how behavior changes in response to text messages. Complementary sub-models will be estimated for each participant to describe their behavioral responses under different weather conditions. Healthy but insufficiently active young adults (n=80) will wear an activity monitor and receive a variety of randomly-timed and randomly-selected notifications via smartphone. GPS coordinates at the time of messages delivery and receipt are recorded and used to look up weather indices at that location at that time. The work is exploratory/descriptive as we will be developing models to describe participants' responses to messages under different weather conditions. This work is needed to develop the decision rules for a subsequent behavioral intervention that will be developed and tested in a future project.

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Key information

Conditions

Cardiovascular Risk Factor

Age range

18 year–29 year

Sex eligibility

All sexes

Study type

Interventional

Phase

Phase 1

Primary location

The Pennsylvania State University

University Park, Pennsylvania, 16802, United States

Who can participate

Healthy volunteers accepted: Yes

Only the study team can determine whether someone qualifies for participation.

Inclusion criteria

Participants capable of reading, speaking and understanding English and of giving informed consent.
Participants between the ages of 18-29 years.
Participants must be free of visual impairment that would interfere with the use of a smartphone.
Participants must own and carry an iPhone (running iOS version 10 or higher) or Android (running operating system 7 or higher) smartphone during waking hours.

Exclusion criteria

Participants engaging in 90 or more minutes of moderate- or greater intensity PA each week.
Participants engaged in organized programs with mandated physical activity (e.g., varsity sports, ROTC).
Participants with contraindications to normal physical activity on the Physical Activity Readiness Questionnaire.
Participants who require an assistive device for mobility or have any other condition that may limit or prevent participation in moderate-intensity physical activity.
Participants who are pregnant or planning to become pregnant within the next 6 months.
Participants with a prior diagnosis of cancer, cardiovascular disease, diabetes or metabolic syndrome.

Treatment and study plan

Short Message with Text and Optional Image

Behavioral

Messages can be up to 256 characters of text and with or without an image. "Move more" and "sit less" messages were written to target established cognitive and affective constructs associated with physical activity (e.g., prompts to action plan, guidance for maximizing pleasure by regulating intensity).

Primary outcomes

Change in Moderate (or Higher) Physical Activity Duration Following Message Receipt

Time frame: 15-minute epochs for the remainder of the walking day

Fitbit-assessed minutes with step counts >= 100 steps/min in 15-minute epochs (steady states represent the change in expected step counts if a message was delivered versus if the message was not delivered)

Sponsors and collaborators

Lead sponsor

Penn State University

Other

Registry information

Official study title

Phase 1 Clinical Trial to Develop a Personalized Adaptive Text Message Intervention Using Control Systems Engineering Tools to Increase Physical Activity in Early Adulthood

Acronym: RandomAIM

Important dates

Study start: 2019
Primary completion: 2020
Study completion: 2020
First posted: Apr 9, 2019
Registry last updated: Nov 4, 2022

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

Published trials that share one or more normalized conditions with this study.

Completed