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Screen dump from the GaitTrack phone application used to assess chronic obstructive pulmonary disease (COPD) with a six-minute walk test. Sensor data are continuously recorded during the timer countdown. Voice prompts, as per the American Thoracic Society instructions, are given at each minute's mark. The smartphone connects via Bluetooth to a Nonin Onyx2 pulse oximeter with heart rate and oxygen saturation continuously displayed for medical alerts.
