Heart HealthStanford Launches AI-Coached Heart Health Trial Targeting 15,000 Adults
Stanford researchers have launched a next-generation smartphone study called My Heart Counts, enrolling up to 15,000 adults in the US and UK. The study builds a digital biobank by collecting passive health data — steps, heart rate, sleep, ECGs — alongside electronic health records. Embedded within it is a randomized crossover trial testing whether AI-generated, personalized coaching messages based on the Transtheoretical Model of Change can increase daily step counts more effectively than generic prompts. The app runs on iOS now, with Android planned for 2027, and supports both English and Spanish. If LLM-driven coaching proves effective at scale, this model could reshape how preventive cardiovascular care is delivered — cheaply, automatically, and without needing human health coaches for every patient.
