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Clinical trial Recruiting at 1 site Interventional Ages 18 and up

ADAPT: HeartSteps program to increase activity after cardiac rehabilitation

Official title: ADAPT Micro-Randomized Trial

Run by University of Michigan · NCT06915220 · Data updated 2026-11-12

This 3-month test sees if the HeartSteps smartphone program plus a Fitbit can help people who are completing or recently finished phase II cardiac rehabilitation increase and keep up their physical activity.

Quick facts

Study typeInterventional
Ages18 Years and up
SexAll
Enrollment70 (estimated)
SponsorUniversity of Michigan
Academic / other
Locations1 site (Ann Arbor, Michigan)
StatusRecruiting
StartedMay 20, 2025
Main results expectedFebruary 2027
Study endsFebruary 2027
Registry record updatedSeptember 25, 2026
Trial IDNCT06915220 on ClinicalTrials.gov

Is this trial a fit for you?

Likely a good fit

Adults over 18 who are patients in the Michigan Medicine system, are completing or completed phase II cardiac rehabilitation within the past 30 days, and who use a compatible smartphone and understand English are ideal candidates.

Probably not a fit

Patients with orthopedic or neurological conditions that prevent safe physical activity, those unable to use a smartphone or wearable device, or those not treated within the Michigan Medicine system may not receive benefit.

A plain-English reading of the study's rules. Only the study team can confirm whether you qualify.

What this trial studies

The ADAPT micro-randomized pilot will enroll 60 patients who are completing or recently completed phase II cardiac rehabilitation at Michigan Medicine for three months. Participants will use the HeartSteps mobile intervention on their smartphone and wear a Fitbit Charge during waking hours while the study delivers different activity-support components in a micro-randomized schedule. The trial collects quantitative step and activity data along with qualitative participant feedback to optimize timing, messaging, and affective strategies aimed at improving positive associations with physical activity. Results will be used to refine HeartSteps for longer-term support of physical activity in cardiac patients.

Why it matters

Potential benefit: If successful, the program could help cardiac rehab patients increase daily physical activity and maintain exercise habits long-term using a scalable smartphone-and-wearable approach.

How similar studies have gone: Mobile health and wearable-based interventions have shown promise for increasing activity in cardiac and general populations, though micro-randomized optimization of HeartSteps specifically in post–cardiac rehab patients is relatively novel.

Who can join: the full rules

Show full inclusion / exclusion criteria 
Inclusion Criteria:

* 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 Criteria:

* 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.

Where it's running

  • University of Michigan
    Ann Arbor, Michigan, United States     Recruiting

Study contacts

Similar studies

Other studies for the same condition or treatment. Recruiting studies are listed first.

How to take part

  1. Review the eligibility criteria above with your treating physician.
  2. Check the official listing on ClinicalTrials.gov for the latest contact details and recruitment status.
  3. Contact the study coordinator or principal investigator to ask for pre-screening. Pre-screening is free and never obligates you to enroll.
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Last reviewed 2026-11-14 by the Find a Trial editorial team. Information on this page is for educational purposes and is not medical advice. Always consult qualified healthcare professionals about clinical trial participation.