My Heart Counts Cardiovascular Health Study: Next Gen
MHC
1 other identifier
interventional
15,000
0 countries
N/A
Brief Summary
The My Heart Counts Cardiovascular Health Study will utilize mobile health capabilities of smartphones to assess daily activity measures and compare these to measures of cardiovascular health risk factors and fitness. The study aims to collect cardiovascular health data on a diverse population by making the application available on both iOS and Android platforms. Using smartphone sensors and connected devices, the study will collect physical activity metrics, heart rate data, and responses to health questionnaires. The study includes a randomized crossover trial component examining the effectiveness of personalized activity coaching prompts generated by a language model compared to generic prompts.
Trial Health
Trial Health Score
Automated assessment based on enrollment pace, timeline, and geographic reach
participants targeted
Target at P75+ for not_applicable
Started Apr 2026
Longer than P75 for not_applicable
Health score is calculated from publicly available data and should be used for screening purposes only.
Trial Relationships
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Study Timeline
Key milestones and dates
First Submitted
Initial submission to the registry
June 13, 2025
CompletedFirst Posted
Study publicly available on registry
February 23, 2026
CompletedStudy Start
First participant enrolled
April 30, 2026
CompletedPrimary Completion
Last participant's last visit for primary outcome
December 31, 2035
ExpectedStudy Completion
Last participant's last visit for all outcomes
December 31, 2035
February 23, 2026
February 1, 2026
9.7 years
June 13, 2025
February 19, 2026
Conditions
Keywords
Outcome Measures
Primary Outcomes (1)
Change in Physical Activity levels
Change in daily physical activity levels as measured by step count smartphone sensors and connected health devices.
Time Frame: 14 days (7 days in each intervention period)
Study Arms (2)
Personalized LLM Coaching
ACTIVE COMPARATORGeneric Activity Prompts
PLACEBO COMPARATORInterventions
Participants receive daily text messages containing exercise coaching prompts generated by a large language model (LLM) that are personalized to the user's demographic information for a period of 7 days.
Participants receive generic daily activity prompts for a period of 7 days (e.g., "Push yourself! Reach 10,000 steps today.")
Eligibility Criteria
You may qualify if:
- years of age or older
- Resident of the United States
- Able to read, understand and consent to study
You may not qualify if:
- Not owning a compatible iOS or Android smartphone
Contact the study team to confirm eligibility.
Sponsors & Collaborators
- Stanford Universitylead
- Imperial College Londoncollaborator
- University of Washingtoncollaborator
MeSH Terms
Conditions
Condition Hierarchy (Ancestors)
Central Study Contacts
Study Design
- Study Type
- interventional
- Phase
- not applicable
- Allocation
- RANDOMIZED
- Masking
- NONE
- Purpose
- PREVENTION
- Intervention Model
- CROSSOVER
- Sponsor Type
- OTHER
- Responsible Party
- PRINCIPAL INVESTIGATOR
- PI Title
- Chair, Department of Medicine
Study Record Dates
First Submitted
June 13, 2025
First Posted
February 23, 2026
Study Start
April 30, 2026
Primary Completion (Estimated)
December 31, 2035
Study Completion (Estimated)
December 31, 2035
Last Updated
February 23, 2026
Record last verified: 2026-02
Data Sharing
- IPD Sharing
- Will not share