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AI-Powered nudges aim to get millions moving

NCT ID NCT07783724

Prevention Sponsor: Fitbit LLC 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
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 This study
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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 Aug 25, 2026 · Last updated Aug 26, 2026 · Updated 1 time

Summary

This trial tests whether personalized pop-up notifications on the Fitbit app can help sedentary adults increase their daily step count. Participants will receive nudges with different timing and message content, some based on behavior science and others on a reinforcement learning algorithm. The goal is to see which approach most effectively encourages more walking.

What this could mean

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

Active substance
Personalized push notifications delivered via the Fitbit app, using different strategies including random timing, behavior science heuristics, and a reinforcement learning algorithm.
What this could lead to
If effective, this approach could offer a scalable, low-cost digital tool to help people become more active and reduce health risks linked to sedentary lifestyles.
What could go wrong
The trial is early and relies on self-reported device use; nudges may lose their effect over time or not work for everyone.

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

13,463 people

The number who actually took part.

Started

Feb 2024

Finished

Aug 2024

Lead sponsor

A company

The lead sponsor is a pharmaceutical, biotech, or medical-device company.

Who can take part

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

Ages

22 to 60 years

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 22-60 years * \[For Phase 2 \& 3\] Daily average steps 1 month prior to recruitment is less than 8000 * Owns a Fitbit device \& smartphone with Fitbit app * Willing to share a month of step count data prior to enrollment data * Wear a Fitbit device regularly (user-reported) Exclusion Criteria: * Advised by a doctor to avoid exercising or limit physical activity * Current employees of Alphabet * \[For phase 2\] Have participated in Phase 1 of the study * \[For phase 3\] Have participated in Phase 1 or 2 of the study

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Conditions

The condition(s) this trial relates to.

Motor Activity Sedentary Behavior

As listed by the trial registrant

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

Sedentary lifestyle

Contacts and locations

Locations

  • Google Office (Digital Study)

    Mountain View, California, 94043, United States

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