Fitness trackers vs. walking tests: which better predicts lung disease outcomes?

This study looks at whether wearing an activity tracker (like a Fitbit) can better predict how people with pulmonary hypertension will do over 12 weeks compared to the standard 6-minute walk test. About 230 participants will wear the tracker and report how they feel. The goal is to see if daily activity levels are a stronger sign of future health than a one-time walking test.