Can a smartwatch replace the clinic walk test for lung disease patients?

NCT ID NCT03893500

Completed Knowledge-focused Sponsor: Stanford University Source: ClinicalTrials.gov ↗

First seen Jul 28, 2026 · Last updated Jul 29, 2026 · Updated 1 time

Summary

This trial tests whether an Apple Watch paired with a special app can accurately measure how far people with pulmonary arterial hypertension (PAH) can walk in six minutes — both in the clinic and at home. Researchers want to see if daily home-based walk tests can detect changes in a patient's condition earlier than standard in-clinic tests. The study involves 63 adults with PAH who will use the watch and app daily for 12 weeks.

What this could mean

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

Active substance: Apple Watch with Walk.Talk.Track. app for home-based six-minute walk tests
What this could lead to: If accurate, this approach could let doctors monitor PAH patients remotely, catching changes earlier and reducing clinic visits.
What could go wrong: The trial is small and early, focused on accuracy rather than treatment effects. The technology may not work reliably for all patients.

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Conditions

The condition(s) this trial relates to.

pulmonary arterial hypertension

As listed by the trial registrant

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

PULMONARY ARTERIAL HYPERTENSION

Contacts and locations

Locations

Stanford University

Stanford, California, 94305, United States

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