Responses to Physical Activity Messages Among Midlife Adults

Study Overview
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Brief Summary
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The purpose of this study is to test the short-term effects of physical activity promotion messages designed for midlife adults. These messages are designed to provide information and motivation for physical activity by engaging key social processes, such as social comparison (i.e., self-evaluations relative to others).

Detailed Description
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This study will employ an intensive assessment procedure, in which participants are asked to complete several brief surveys per day via mobile device. On some days, as described below, survey content will be assigned with an embedded experimental design, administered via micro-randomization (i.e., randomization to receive one of multiple types of content at each momentary report). These methods allow for insight into the immediate effects of different types of content and their accumulated effects over the study period, as participants go about their normal activities. Participants will complete an initial survey to assess their global and recent experiences (e.g., demographic information, social media use). Participants then will be asked to engage in 7 days of ambulatory data collection (i.e., as they go about their normal daily activities). This includes wearing pedometers to capture PA behavior (steps per day and aerobic-intensity PA) and completing 4 surveys per day via their smartphone. A. For the first 3 days, surveys will assess each participant's preferences and responses to potential message content as they naturally occur. Content has been pre-tested in preliminary work. This will establish participants' baseline behaviors. B. For the following 2 days, participants will be randomized at each survey to either: 1) make an upward PA comparison (to someone engaging in a lot of activity), 2) make a downward PA comparison (to someone engaging in very little activity), or 3) assess a different experience (e.g., received social support). C. For the final 2 days, participants will be randomized at each survey to either: 1) informational messages about ways to increase activity, 2) encouragement to increase their activity in healthy ways, or 3) reminders about their activity goals. Phases B and C will be counterbalanced, such that half of participants will receive prompts described in Phase B before Phase C, and half will receive prompts described in Phase C before Phase B.

Official Title
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Evaluation of a Tailored Digital Intervention to Promote PA and Reduce CVD Risk Among Women in Midlife

Conditions
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Exercise, Sedentary Behavior, Motivation

Intervention / Treatment
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* Behavioral: Encouragement/Support
* Behavioral: Social Comparison


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Adult age 40-60 years old Sedentary (<150 minutes of moderate-intensity or 75 minutes of vigorous-intensity physical activity a week) One or more cardiovascular risk conditions (i.e., smoking, diagnoses of obesity. prediabetes/type 2 diabetes, prehypertension/hypertension, high cholesterol, metabolic syndrome) English language fluency Own a personal smartphone Have no medical or psychiatric contraindications to changing their physical activity (e.g., current injury, substance use disorder) Exclusion Criteria: Not an adult age 40-60 years Not sedentary (≥150 minutes of moderate-intensity or 75 minutes of vigorous-intensity physical activity a week) No health conditions listed above (smoking, diagnoses of obesity, prediabetes/type 2 diabetes, prehypertension/hypertension, high cholesterol, metabolic syndrome) No English language fluency Does not own a personal smartphone Has medical or psychiatric contraindications to changing their physical activity (e.g., current injury, substance use disorder)

Ages Eligible for Study
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Minimum Age: 40 Years
Maximum Age: 60 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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Accepts Healthy Volunteers

Study Plan
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How is the study designed?
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Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Single Arm (All Participants)<br>Within this arm, participants are randomized to one of the interventions described below at each of 4 times per day. | Behavioral: Encouragement/Support<br>* Messages that focus on improving self-efficacy and motivation for physical activity<br>Behavioral: Social Comparison<br>* Messages that provide exposure to another person's physical activity engagement data (for comparison)<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Number of steps | Assessed via pedometer | up to 24 weeks | 
| Number of minutes in moderate-to-vigorous activity | Assessed via pedometer | up to 24 weeks | 
| Number of minutes spent sedentary | Assessed via pedometer | up to 24 weeks | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Motivation for physical activity | Assessed via single self-report item | up to 24 weeks |