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AI coach in your pocket: text prompts aim to boost daily activity

NCT ID NCT06880315

Symptom relief Sponsor: Stanford University Source: ClinicalTrials.gov ↗

What the study statuses mean

This study's is highlighted.

Recruitment status, easiest to join first

Recruiting now
This trial is taking on new participants right now.
Not yet recruiting This study
Registered, but not yet taking participants.
By invitation only
Not open to general applications. Only people the study team invites can take part.
Paused
Paused for now. It may or may not start again.
Ongoing
Running, but no longer taking on new participants.
Completed
The trial has finished. Results may not be published yet.
Stopped early
Stopped early, before it reached the end. That can be for many reasons, including safety.
Cancelled
Cancelled before anyone took part.

Expanded access (not trials)

Expanded access
Not a trial. This treatment can be requested outside a study, case by case, for people who qualify.
Expanded access (paused)
Not a trial. The treatment can normally be requested outside a study, but is unavailable right now.
Expanded access (ended)
Not a trial. The treatment could once be requested outside a study, but no longer can.
Approved
The treatment has been approved, so it is available normally rather than through this programme.

When the status isn't known

Details not published
The full record has not been published yet, so there is little to show here.
Status unknown
This status has not been confirmed recently, so it may be out of date.

First seen Jun 24, 2026 · Last updated Jul 24, 2026 · Updated 3 times

Summary

This pilot study tests whether personalized text messages created by a large language model (AI) can encourage people to be more physically active. Fifty adults will receive daily prompts on their iPhones and Apple Watches for 14 days, comparing personalized messages to generic ones. The goal is to see if AI-tailored coaching can increase step counts and inform future versions of the My Heart Counts app.

What this could mean

Our plain-language read of the trial. This is informational only, not medical advice or a prediction.

Active substance
personalized LLM-generated coaching prompts
What this could lead to
If it works, this could point toward a simple, low-cost way to help people become more active using personalized text messages.
What could go wrong
This is a very small pilot study with only 50 participants over 14 days. Results may not apply to everyone, and the effect of personalized prompts may be small or short-lived.

This is an AI summary of the original study and may miss details. Read our disclaimer.

Study facts

What this study's own registry entry says, in plain language.

Phase

Not a phased trial

Phase numbers describe drug development. The registry uses this when they do not apply, as it does for trials of devices, procedures or behaviour changes, and for observational studies.

Participants

About 50 people

The number the study aims to enrol. It can still change while the study runs.

Expected to start

Jan 2027

An estimate. Start dates often move.

Expected to finish

Dec 2027

An estimate. End dates often move.

Lead sponsor

Other sponsor

The registry's catch-all category, for sponsors it does not file as a company, a government agency, or a research network.

Who can take part

This study's own entry requirements. Only the study team can say for certain whether you qualify.

Ages

18 years and older

Sex

Anyone

Healthy volunteers

Accepted

You do not need to have the condition being studied to take part.

Show the full entry requirements

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: * Age: Participants must be 18 years or older. * Health Status: Participants must be healthy enough to engage in physical activity. * Language Proficiency: Participants must be able to read, understand, and consent in English or Spanish (dependent on which is being studied). * Device Ownership: Participants must possess an iPhone and an Apple Watch. * Data Sharing: Participants must be willing to share their HealthKit data via secure upload. Exclusion Criteria: * Age: Participants under the age of 18. * Health Status: Participants who are not healthy enough to engage in physical activity. * Language Proficiency: Participants who cannot read, understand, or consent in English or Spanish. * Device Ownership: Participants who do not have both an iPhone and an Apple Watch. * Data Sharing: Participants unwilling to share their HealthKit data via secure upload.

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Conditions

The condition(s) this trial relates to.

Motor Activity

As listed by the trial registrant

The condition terms exactly as the trial's registrant entered them.

Exercise

How to take part

Only the study team decides who joins. These are the ways to reach them.

  1. The official record

    The full official record for this study. This one lists no contact details, but it is the first place any would appear.

    Open the record ↗

  2. A doctor treating you

    A doctor who knows your case can contact a study site on your behalf, and can tell you whether this study is worth pursuing at all.

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Other studies related to the condition(s) this trial covers.