Cardiovascular DiseasesADAPT MRTNCT06915220
ADAPT Micro-Randomized Trial
A study testing mobile health app in people with Cardiovascular Diseases, run by University of Michigan at 1 site in United States.
Trial summary
The goal of this study is to collect quantitative and qualitative data that can be used to optimize the HeartSteps mHealth intervention for physical activity. The current version of the intervention is intended to help patients with heart disease increase and maintain their physical activity long-term. Read more about this study
- Who is it for?
- Ages 18 years and older
- Conditions the study is for
- Cardiovascular Diseases
- What is being tested?
- mobile health app
- Type of treatment
- Lifestyle or therapy programme
- Could I receive a placebo?
- No, everyone receives an active treatment
- How many people
- 70 participants
- Where
- 1 siteUnited States
- Study dates
- 20 May 2025to Feb 2027
- Phase
- Interventional
- Are there results?
- Not yet: the study is under way
Key requirements
Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.
- Ages 18 years and older
- All sexes
- No healthy volunteers
- Adult, Older adult
Who may be able to join
- Must be a patient within the Michigan Medicine clinical system with data available in the electronic health record after January 1, 2020.
- Age > 18
- Owns and is a daily user of an Android or iPhone smartphone with study supported operating software.
- Understands English to enable informed consent, completion of study-related surveys, and compliance with study notifications.
- Will be completing within 30 days or have completed in the last 30 days the cardiac rehabilitation program at Michigan Medicine based on one of the following indications:
- Coronary artery disease (including acute coronary syndromes and stable angina) following percutaneous coronary intervention (PCI)
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- Coronary artery disease following coronary artery bypass surgery (CABG)]
- Valve repair or replacement (either surgical or percutaneous)
- Coronary artery disease or an acute coronary syndrome not requiring revascularization
Who cannot join
- Orthopedic or neurological condition limiting ability to actively engage in moderate intensity physical activity (e.g., brisk walking)
- Greater than mild cognitive impairment
- Wrist too large to wear an activity tracker comfortably. This will be assessed by asking participants "If they have ever had difficulty wearing a watch in the past due to the band being too small."
- Currently receiving palliative care and/or in hospice care
- Severe valvular stenosis or regurgitation
- Unrevascularized left main coronary artery disease (> 50% obstruction on angiography) or proximal left anterior descending disease (>70% obstruction on angiography).
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- Exercise-induced ventricular tachycardia
- Cardiac arrest within the prior 6 months
- New York Heart Association (NYHA) class III or IV heart failure
- Pulmonary arterial hypertension treated with inhaled or intravenous pulmonary hypertension-specific therapy
- Ejection fraction <40%
- Determined to be unsafe for participation in this program as assessed by a clinical nurse or investigative team.
Trial locations and contacts
1 site in 1 country. Contact the study team or a site near you to ask about taking part.
United States1 site, 1 recruiting
- Recruiting
University of Michigan
Ann Arbor, Michigan, 48109
Pedja Klasnja, Ph.D., 734-763-3581, klasnja@umich.edu
Jessica Golbus, M.D.
About this study
The goal of this study is to collect quantitative and qualitative data that can be used to optimize the HeartSteps mHealth intervention for physical activity. The current version of the intervention is intended to help patients with heart disease increase and maintain their physical activity long-term. To accomplish this goal, a 3-month pilot micro-randomized trial (MRT) will be conducted with 60 patients who are currently completing or have recently completed phase II cardiac rehabilitation (CR).
The core of the study participation is the use of the HeartSteps intervention over the course of 3 months. This includes wearing the Fitbit Charge activity tracker during waking hours and using the HeartSteps intervention to support their efforts to be active. The HeartSteps intervention consists of two sets of intervention components: (1) components intended to improve participants' affective associations with physical activity, including activity suggestions designed to to trigger positive feelings and associate them with being active, and prompts to bring their awareness to intrinsically motivating aspects of being active; and (2) components that target reflective self-regulatory processes, including graphs for self-monitoring, prompts to plan activity, and weekly activity goals. How exactly, and how much, participants will use HeartSteps will not be prescribed since our goal is to understand naturalistic trajectory of engagement with the intervention.
- Conditions
- Cardiovascular Diseases
- Being tested
- mobile health app
- Keywords
- Cardiac Rehabilitation, Physical activity, mobile health intervention
- Medical subject headings
- Cardiovascular Diseases, Motor Activity
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
mobile health appBehavioural
HeartSteps is an innovative mobile health (mHealth) app designed for cardiac rehabilitation patients. The app features dynamic push notifications, daily and weekly surveys to capture psychosocial data, and an in-app dashboard that provides feedback on activity levels, goal progress, and reminders. Integrated with a Fitbit Charge tracker, HeartSteps emphasizes behavioral changes through engaging features. The intervention is personalized to meet individual needs and preferences, enhancing patient engagement and promoting sustained physical activity.
| Study group | Role | What they receive |
|---|---|---|
| Intervention | Experimental | Participants receive the HeartSteps mHealth intervention for 3 months to support and increase physical activity. Components include:
1. Activity Suggestions: Push notifications encouraging walks, randomized twice daily (probability 0.5).
2. Morning Salience Messages: Notifications highlighting positive aspects of activity, randomized daily (probability 0.5).
3. Planning Prompts: Notifications to plan next day's activity, randomized daily (probability 0.5).
4. Weekly Reflection: Prompts each Sunday to reflect on past activity, set goals, and plan for the next week.
5. Pull Interventions: In-app features like activity dashboards and planning tools.
6. Ecological Momentary Assessments (EMA): Daily and weekly surveys on psychosocial constructs related to physical activity.
Participants wear a Fitbit Charge tracker to monitor activity, synced to their MyDataHelps account. The intervention aims to optimize engagement and physical activity levels. Receives: Behavioral: mobile health app |
What is being measured
The primary outcome is the main question the study is designed to answer.
Weekly number of minutes of moderate to vigorous physical activity
The primary outcome of the study is number of weekly minutes of moderate to vigorous physical activity (MVPA), as assessed by the Fitbit Charge 6 activity tracker.
Primary analysis will assess the difference in MVPA between the baseline week and the last (i.e. 12th) week of the study.
Measured: Baseline, 12 weeks
Secondary outcomes (3)
3-hour step count
Number of steps, as assessed by the Fitbit Charge 6 activity tracker, measured in the three-hour window following the randomization of activity suggestions.
This outcome will be assessed after each decision point for the micro-randomized activity suggestions. Each participant will have two decision points per day for the duration of the study.
Measured: 12 weeks
Daily step count
Number of steps per day, assessed by the Fitbit Charge 6 activity tracker.
Measured: 12 weeks
Affective exercise experiences (AFFEXX) scale
A validated 36-item self-report instrument that assesses participants' affective associations with physical activity.
AFFEXX scale will be administered weekly for the duration of the study. The main analysis of this outcome will assess pre-post differences in the AFFEXX score between baseline and 12th week.
Measured: Baseline, 12 weeks
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted8 Apr 2025
- Study start20 May 2025
- Primary completionFeb 2027 (estimated)
- Study completionFeb 2027 (estimated)
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Other trials for Cardiovascular DiseasesStudies of the same condition, open and under way.
- More trials run by University of MichiganThe sponsor's other registered studies.
- What the trial phases meanHow a treatment moves from first tests in people to approval.
More details
For doctors and researchers: how the study is designed, who runs it, and its registry IDs.
Study design
- Study type
- Interventional
- Phase
- Phase N/A
- Primary purpose
- Supportive care
- Allocation
- Not applicable
- Intervention model
- Single group
- Model description
- The study uses a micro-randomized trial (MRT) design to optimize the HeartSteps mHealth intervention for physical activity. The following components are macro-randomized: 1. Activity Suggestions: Randomized twice daily (probability 0.5), averaging one suggestion per day. 2. Morning Salience Messages: Randomized daily (probability 0.5), averaging one message every other day. 3. Planning Prompts: Randomized daily (probability 0.5), averaging one prompt every other day. The following components are provided without randomization: 4, Weekly Reflection: Prompts participants each Sunday to reflect on past activity, set goals, and plan for the next week. 5, Pull Interventions: In-app features like activity dashboards and planning tools. 6\. Ecological Momentary Assessments (EMA): Daily and weekly surveys on psychosocial constructs related to physical activity. This plan collects data to optimize intervention timing and content for better engagement and physical activity outcomes.
- Masking
- None (open label)
- Enrolment
- 70 participants (estimated)
Sponsor and investigators
- Lead sponsor
- University of Michigan
- Sponsor type
- University, hospital or other
- Collaborators
- National Heart, Lung, and Blood Institute (NHLBI)
- Responsible party
- Principal investigator, Pedja Klasnja, University of Michigan
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT06915220
- Sponsor's protocol ID
- HUM00269831
- Other IDs
- 5R01HL125440-07
- Acronym
- ADAPT MRT
- Status last verified
- Sep 2026
- First submitted
- 1 Apr 2025
- Last updated
- 25 Sep 2026
- Results posted
- No
- Data monitoring committee
- No
- FDA-regulated drug
- No
- FDA-regulated device
- No
- Individual data sharing
- Undecided
Study at a glance
From the registry record, last updated by the sponsor on 25 Sep 2026. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- ADAPT Micro-Randomized Trial
- ClinicalTrials.gov ID
- NCT06915220
- Acronym / sponsor ID
- ADAPT MRT / HUM00269831
- Conditions
- Cardiovascular Diseases
- Keywords
- Cardiac Rehabilitation, Physical activity, mobile health intervention
- Study type
- Interventional
- Recruitment status
- Recruiting
- Enrolment
- 70 participants (estimated)
- Lead sponsor
- University of MichiganUniversity, hospital or other
- Collaborators
- National Heart, Lung, and Blood Institute (NHLBI)
- Study start
- 20 May 2025 (actual)
- Primary completion
- Feb 2027 (estimated)
- Study completion
- Feb 2027 (estimated)
- First posted
- 8 Apr 2025 (actual)
- Results
- Not posted in the source record
Clinical summary
The research question as the sponsor registered it. This describes what the study plans to test, not what it found.
The goal of this study is to collect quantitative and qualitative data that can be used to optimize the HeartSteps mHealth intervention for physical activity. The current version of the intervention is intended to help patients with heart disease increase and maintain their physical activity long-term. To accomplish this goal, a 3-month pilot micro-randomized trial (MRT) will be conducted with 60 patients who are currently completing or have recently completed phase II cardiac rehabilitation (CR).
The core of the study participation is the use of the HeartSteps intervention over the course of 3 months. This includes wearing the Fitbit Charge activity tracker during waking hours and using the HeartSteps intervention to support their efforts to be active. The HeartSteps intervention consists of two sets of intervention components: (1) components intended to improve participants' affective associations with physical activity, including activity suggestions designed to to trigger positive feelings and associate them with being active, and prompts to bring their awareness to intrinsically motivating aspects of being active; and (2) components that target reflective self-regulatory processes, including graphs for self-monitoring, prompts to plan activity, and weekly activity goals. How exactly, and how much, participants will use HeartSteps will not be prescribed since our goal is to understand naturalistic trajectory of engagement with the intervention.
Study design
- Primary purpose
- Supportive care
- Allocation
- Not applicable
- Intervention model
- Single group
- Masking
- None (open label)
- Number of arms
- 1
- Model description
- The study uses a micro-randomized trial (MRT) design to optimize the HeartSteps mHealth intervention for physical activity. The following components are macro-randomized: 1. Activity Suggestions: Randomized twice daily (probability 0.5), averaging one suggestion per day. 2. Morning Salience Messages: Randomized daily (probability 0.5), averaging one message every other day. 3. Planning Prompts: Randomized daily (probability 0.5), averaging one prompt every other day. The following components are provided without randomization: 4, Weekly Reflection: Prompts participants each Sunday to reflect on past activity, set goals, and plan for the next week. 5, Pull Interventions: In-app features like activity dashboards and planning tools. 6. Ecological Momentary Assessments (EMA): Daily and weekly surveys on psychosocial constructs related to physical activity. This plan collects data to optimize intervention timing and content for better engagement and physical activity outcomes.
| Arm | Type | Receives |
|---|---|---|
| Intervention | Experimental | Behavioral: mobile health appParticipants receive the HeartSteps mHealth intervention for 3 months to support and increase physical activity. Components include: 1. Activity Suggestions: Push notifications encouraging walks, randomized twice daily (probability 0.5). 2. Morning Salience Messages: Notifications highlighting positive aspects of activity, randomized daily (probability 0.5). 3. Planning Prompts: Notifications to plan next day's activity, randomized daily (probability 0.5). 4. Weekly Reflection: Prompts each Sunday to reflect on past activity, set goals, and plan for the next week. 5. Pull Interventions: In-app features like activity dashboards and planning tools. 6. Ecological Momentary Assessments (EMA): Daily and weekly surveys on psychosocial constructs related to physical activity. Participants wear a Fitbit Charge tracker to monitor activity, synced to their MyDataHelps account. The intervention aims to optimize engagement and physical activity levels. |
Who may qualify
- Ages
- 18 years and older
- Sex
- All
- Healthy volunteers
- Not accepted
- Age groups
- Adult, Older adult
Key inclusion criteria (9 listed)
- Must be a patient within the Michigan Medicine clinical system with data available in the electronic health record after January 1, 2020.
- Age > 18
- Owns and is a daily user of an Android or iPhone smartphone with study supported operating software.
- Understands English to enable informed consent, completion of study-related surveys, and compliance with study notifications.
- Will be completing within 30 days or have completed in the last 30 days the cardiac rehabilitation program at Michigan Medicine based on one of the following indications:
Key exclusion criteria (12 listed)
- Orthopedic or neurological condition limiting ability to actively engage in moderate intensity physical activity (e.g., brisk walking)
- Greater than mild cognitive impairment
- Wrist too large to wear an activity tracker comfortably. This will be assessed by asking participants "If they have ever had difficulty wearing a watch in the past due to the band being too small."
- Currently receiving palliative care and/or in hospice care
- Severe valvular stenosis or regurgitation
Eligibility is decided by the study team after screening; this overview does not establish that a patient qualifies. Full inclusion and exclusion criteria.
Interventions
| Intervention | Type | Arms |
|---|---|---|
| mobile health appHeartSteps is an innovative mobile health (mHealth) app designed for cardiac rehabilitation patients. The app features dynamic push notifications, daily and weekly surveys to capture psychosocial data, and an in-app dashboard that provides feedback on activity levels, goal progress, and reminders. Integrated with a Fitbit Charge tracker, HeartSteps emphasizes behavioral changes through engaging features. The intervention is personalized to meet individual needs and preferences, enhancing patient engagement and promoting sustained physical activity. | Behavioural | Intervention |
Primary outcome
Weekly number of minutes of moderate to vigorous physical activity
Time frame: Baseline, 12 weeks
The primary outcome of the study is number of weekly minutes of moderate to vigorous physical activity (MVPA), as assessed by the Fitbit Charge 6 activity tracker. Primary analysis will assess the difference in MVPA between the baseline week and the last (i.e. 12th) week of the study.
3 secondary outcomes
3-hour step count
Time frame: 12 weeks
Daily step count
Time frame: 12 weeks
Affective exercise experiences (AFFEXX) scale
Time frame: Baseline, 12 weeks
Results and safety
This study is still under way. Results are not available in the source record yet.
Research links
- Official record on ClinicalTrials.govLast updated by the sponsor 25 Sep 2026.
- Individual participant dataSharing planned: Undecided
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Referral and contact
AzTrials does not enrol participants or take referrals. Contact the study team or a site listed below; they decide who can take part.
1 site in 1 country: see every site and its status.
Questions about this trial
What is this clinical trial studying?
A study testing mobile health app in people with Cardiovascular Diseases, run by University of Michigan at 1 site in United States.
The full registered description is in the About this study section and the official record.
Who may be eligible to take part?
The sponsor lists 9 inclusion and 12 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.
Is this clinical trial currently recruiting?
The record says: looking for participants now, as of the sponsor's last update on 25 Sep 2026. Status can change between updates, so confirm with the study contact before making plans.
Where is the study taking place?
The record lists 1 site in United States. Whether a site is taking part right now should be confirmed with that site. See every site.
What are the possible benefits and risks?
They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.
Are results available for this study?
This study is still under way. Results are not available in the source record yet.
How can a doctor refer a patient or contact the research team?
Contact Pedja Klasnja, Ph.D. in Information Science (734-763-3581, klasnja@umich.edu), or a site near the patient. AzTrials does not enrol participants or take referrals.
What does the primary outcome measure?
Weekly number of minutes of moderate to vigorous physical activity (time frame: Baseline, 12 weeks). It is what the study was designed to measure, not a finding.
Where can I read the original study information?
Does a listing mean the treatment is approved or proven to work?
No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.
How often is this information updated?
AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 25 Sep 2026.