Abstract
Background: The 6-minute walk test (6MWT) remains a valuable clinical tool in Pulmonary Arterial Hypertension (PAH). There is an increasing need for at-home monitoring of exercise tolerance in PAH.
Aims: Evaluate the performance of Walk.Talk.Track. App (WTT) on Apple Watch for remote 6MWT.
Methods: A series of trials were executed: [1] Single researcher walked on marked indoor & outdoor tracks under different Apple Health Kit (AHK) settings; [2] Healthy volunteers performed outdoor 6MWTs recorded by WTT and a Respiratory Therapist (RT); [3] Healthy volunteers performed WTT 6MWTs remotely.
Results: [1] WTT distances demonstrated excellent correlation with track-recorded distances on both AHK outdoor (indoor & outdoor r2=0.97) and indoor (indoor & outdoor r2=0.93) settings. [2] 6MWTs performed by 8 healthy volunteers demonstrated high correlation (r2=0.88, n=31) and reliability (mean 9.4±36m) compared to RT recorded distances. Correlation and accuracy remained high (r2=0.90, mean 4.9±20m) for short distance walks (6MWTs at <440m, n=12). [3] Remote 6MWTs performed by 7 healthy volunteers demonstrated moderate intra-subject reliability (ICC=0.71, n=40).
Conclusions: Healthy subject testing of WTT recorded 6MWT demonstrated appropriate accuracy and reliability in all settings and at variable walk distances. The WTT research tool is now being utilized for an ongoing trial in PAH (NCT03893500).
Footnotes
Cite this article as: European Respiratory Journal 2021; 58: Suppl. 65, PA3445.
This abstract was presented at the 2021 ERS International Congress, in session “Prediction of exacerbations in patients with COPD”.
This is an ERS International Congress abstract. No full-text version is available. Further material to accompany this abstract may be available at www.ers-education.org (ERS member access only).
- Copyright ©the authors 2021