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The Mobile-Based 6-Minute Walk Test: Usability Study and Algorithm Development and Validation.

Dario Salvi1, Emma Poffley2, Elizabeth Orchard2

  • 1Institute of Biomedical Engineering, Department of Engineering Science, University of Oxford, Oxford, United Kingdom.

JMIR Mhealth and Uhealth
|January 4, 2020
PubMed
Summary
This summary is machine-generated.

This study developed a mobile app for the six-minute walk test (6MWT), enabling patients to perform this functional capacity assessment remotely. The app demonstrated high accuracy and usability, offering a convenient alternative to traditional hospital-based testing.

Keywords:
cardiologydigital signal processingexercise testglobal positioning systemmobile appspulmonary hypertension

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Area of Science:

  • Cardiopulmonary medicine
  • Digital health technology
  • Biomedical engineering

Background:

  • The six-minute walk test (6MWT) is crucial for assessing functional capacity in cardiopulmonary patients.
  • Traditional 6MWT requires hospital facilities, staff, and associated costs, limiting accessibility.
  • There is a need for convenient, community-based functional assessment methods.

Purpose of the Study:

  • To develop and validate a mobile phone-based system for conducting the 6MWT in the community.
  • To create algorithms for accurate distance calculation using smartphone sensors.
  • To integrate wireless pulse oximetry for enhanced patient monitoring.

Main Methods:

  • Developed two algorithms: GPS-based for outdoor and inertial sensor-based for indoor distance calculation.
  • Integrated algorithms into a mobile app with wireless pulse oximetry and a back-end server.
  • Conducted Bland-Altman analysis comparing app-estimated distances with a trundle wheel reference.
  • Assessed app usability with patients and clinicians using a technology acceptance model.

Main Results:

  • Indoor algorithm showed a mean difference of -2.013 m (SD 7.84 m); outdoor algorithm showed -0.80 m (SD 18.56 m).
  • Absolute maximum differences were below clinically significant thresholds for both algorithms.
  • The app was demonstrated to be usable and well-accepted by patients and clinicians.

Conclusions:

  • The developed system enables patients to perform the 6MWT conveniently outside the hospital.
  • Integration of pulse oximetry provides additional health status information.
  • Preliminary findings indicate high accuracy and user acceptance, suggesting clinical value pending further assessment.