Limitations
IPF
The study has limitations. First, although our retrospective analysis showed no evidence that baseline DLCO had an effect on outcomes following our training programme (Second, we did not use supplementary oxygen during PR for participants other than for those already on LTOT. Although promising benefits have been reported with acute oxygen supplementation during exercise in patients with IPF,Finally, the number of IPF participants who remained in the study was small and did not allow us to investigate the effect of HIIT over time in this particular group.