Assessing a GPS-Based 6-Minute Walk Test for People With Persistent Pain: Validation Study.

Area of Science:

• Rehabilitation Medicine
• Digital Health
• Pain Management

Background:

• The 6-minute walk test (6MWT) is a standard functional capacity assessment for individuals with persistent pain.
• Conventional 6MWT requires in-person supervision, posing challenges during pandemics or for remote populations.
• GPS technology offers a potential solution for remote, unsupervised distance measurement.

Purpose of the Study:

• To evaluate the validity of a GPS-based smartphone app for measuring walking distance in persistent pain patients compared to the traditional 6MWT.
• To assess differences in pain provocation between the GPS-app and conventional 6MWT methods.

Main Methods:

• Thirty-six participants with persistent pain completed both a conventional 6MWT and a GPS-app 6MWT on outdoor circuits.
• Tests were randomized and separated by a 15-minute rest.
• Bland-Altman analysis determined agreement, with pain rated on an 11-point scale pre- and post-test.

Main Results:

• The GPS app measured a mean distance 13.2m greater than the conventional 6MWT, exceeding the 100m acceptable difference.
• 95% limits of agreement were 103.9m and -77.6m, indicating poor interchangeability.
• Pain increased slightly more with the conventional test (1.1 points) than the app test (0.8 points).

Conclusions:

• The GPS-based 6MWT app demonstrated limited validity and is not interchangeable with the conventional test for persistent pain patients.
• Discrepancies may stem from GPS accuracy, varied track layouts, and participant variability.
• The GPS app holds potential for remote monitoring of functional capacity in the home environment, warranting further research for accuracy improvements.