Utility of At-home Monitoring of Exercise Capacity by App-based 6-minute Walk Test

Study Purpose

  • - Evaluate for accuracy and reproducibility of data collected via the participant-operated Walk.
Talk.Track. (WTT) app combined with Apple Watch during in-clinic, technician proctored 6MWT's.
  • - Determine whether the WTT app on the Apple Watch can accurately collect information on distance traveled and heart rate (HR) during in-clinic 6MWT run by American Thoracic Society (ATS) guidelines - Determine whether participants can operate the WTT app and Apple Watch effectively to gather accurate data in a monitored and home-based setting - Prospectively monitor for changes in WTT app recorded 6MWT results following initiation of therapy in a treatment naïve cohort of PAH participants - Evaluate whether changes from baseline in 6 minute walk distance (6MWD) and heart rate recovery at one minute (HRR1) as well as other variables that have been associated with disease severity in PAH and left-sided heart disease (resting HR, heart rate variability [HRV], chronotropic index [CI]) can be identified before the 12-week follow up when comparing the treatment arm and the control arm - Evaluate whether changes from baseline in the HRR1, resting HR, HRV and/or CI are more evident in treatment responders when compared to treatment non-responders.

Recruitment Criteria

Accepts Healthy Volunteers

Healthy volunteers are participants who do not have a disease or condition, or related conditions or symptoms

Study Type

An interventional clinical study is where participants are assigned to receive one or more interventions (or no intervention) so that researchers can evaluate the effects of the interventions on biomedical or health-related outcomes.

An observational clinical study is where participants identified as belonging to study groups are assessed for biomedical or health outcomes.

Searching Both is inclusive of interventional and observational studies.

Eligible Ages 18 Years - 70 Years
Gender All
More Inclusion & Exclusion Criteria

Inclusion Criteria:

  • - Diagnosis of WHO Group I Pulmonary Arterial Hypertension (PAH) (Idiopathic (I)PAH, Heritable PAH (including Hereditary Hemorrhagic Telangiectasia), Associated (A)PAH (including collagen vascular disorders, drugs+toxins exposure, congenital heart disease, and portopulmonary disease).
- Do not meet exclusion criteria

Exclusion Criteria:

- Pulmonary Hypertension due to left heart disease (PH-LHD, WHO group 2), Pulmonary hypertension due to chronic lung disease (PH-CLD, WHO group 3), Chronic thrombo-embolic pulmonary hypertension (CTEPH, WHO group 4), pulmonary hypertension with unclear and/or multi-factorial mechanisms (WHO goup 5) - Inability to perform a 6 minute walk test (6MWT)

Trial Details

Trial ID:

This trial id was obtained from ClinicalTrials.gov, a service of the U.S. National Institutes of Health, providing information on publicly and privately supported clinical studies of human participants with locations in all 50 States and in 196 countries.


Phase 1: Studies that emphasize safety and how the drug is metabolized and excreted in humans.

Phase 2: Studies that gather preliminary data on effectiveness (whether the drug works in people who have a certain disease or condition) and additional safety data.

Phase 3: Studies that gather more information about safety and effectiveness by studying different populations and different dosages and by using the drug in combination with other drugs.

Phase 4: Studies occurring after FDA has approved a drug for marketing, efficacy, or optimal use.

Lead Sponsor

The sponsor is the organization or person who oversees the clinical study and is responsible for analyzing the study data.

Stanford University
Principal Investigator

The person who is responsible for the scientific and technical direction of the entire clinical study.

Principal Investigator Affiliation N/A
Agency Class

Category of organization(s) involved as sponsor (and collaborator) supporting the trial.

Overall Status Not yet recruiting

The disease, disorder, syndrome, illness, or injury that is being studied.

Pulmonary Arterial Hypertension
Study Website: View Trial Website
Arms & Interventions


Experimental: Initiating a new PAH medication

Participants will start a new PAH medication

Active Comparator: Continuing previous PAH medication regimen

Participants will continue the medication regimen that they were on prior to enrollment


Device: - Home-based 6 minute walk test

Participants will receive a loaner Apple Watch with the Walk.Talk.Track. (WTT, produced by PHaware) app downloaded. Participants will perform a daily 6MWT at home using the Apple Watch and WTT app. They will undergo a history and physical, blood draw, echocardiogram and in-clinic 6MWT at the baseline and 12-week follow up visit.

Contact Information

This trial has no sites locations listed at this time. If you are interested in learning more, you can contact the trial's primary contact:

Ryan j Anderson, MD



For additional contact information, you can also visit the trial on clinicaltrials.gov.

For more information, please contact PHA at Research@PHAssociation.org and refer to the terms of service below.

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