ADAPT Micro-Randomized Trial for Heart Disease Patients

This study is testing a mobile health app called HeartSteps. HeartSteps is designed to help people with heart disease increase and keep up their physical activity over time. The app sends you messages, asks you questions, and shows you your activity levels and goals. Researchers want to see how well HeartSteps works to help you be more active. They will measure your moderate to vigorous physical activity at the beginning and after 12 weeks. You can join if you are over 18, use an Android or iPhone, understand English, and are a patient within the Michigan Medicine system who has recently completed cardiac rehabilitation. The study aims to enroll 60 participants, but its current recruitment status is unclear.

Study design: This is a pilot micro-randomized trial involving 60 participants. It is an interventional study, meaning participants will receive a specific intervention.
What's involved: You would use the HeartSteps app and wear a Fitbit Charge activity tracker during waking hours for 3 months.
Compensation: Not stated in the trial record.
Follow-up: Your physical activity will be measured at the start of the study and again after 12 weeks.

AI-generated from the public study record. Only the study team can confirm whether you're eligible — confirm details with them before making decisions.

ADAPT Micro-Randomized Trial

Recruiting

NAAges 18+InterventionalSupportive care

University of Michigan

~60 participants

Updated 2026-06-01 on ClinicalTrials.gov

What's tested:mobile health app

At a glance

Recruiting sites

1 of 1 listed site is recruiting right now

RecruitingSuspended, closed, or not yet open

What they're measuring

Weekly number of minutes of moderate to vigorous physical activity

Measured over Baseline, 12 weeks

Conditions

Cardiovascular Diseases

Where it's being run

1 sites across 1 states

Michigan1

Who to contact

Pedja Klasnja, Ph.D. in Information Science

[email protected]

734-763-3581

Email the study team

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Do you actually qualify for this trial?

Add a private profile and we'll compare every criterion below against your situation — and tell you which ones are met, uncertain, or excluding.

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Eligibility criteria

Inclusion

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)

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

Exclusion

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).

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.

What this trial measures

Weekly number of minutes of moderate to vigorous physical activityBaseline, 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.

Trialytics