Comparison of the 6-minute walk distance measured on a 30 m track with guidance of a healthcare professional and those measured with a mobile application outdoors by participants themselves: a validation study

To improve the practical application of measuring exercise capacity, the purpose of this study was to compare the 6 min walk distance (6MWD) obtained at a 30 m track with the guidance of healthcare professionals vs. the 6MWD obtained by participants themselves using an app. In total, 37 participants performed both tests. The mean of the differences between the 6MWD on the tests was -4 ± 45 m (95% limits of agreement: 84 to -99 m). The overall agreement between the two 6MWD measures was 97% with an intraclass correlation coefficient of 0.96 (95% confidence interval: 0.91-0.98, P < 0.001). The use of an app is feasible, reliable, and valid to assess the 6MWD.