Case Report: Rehabilitation assessment and exercise using cardiopulmonary exercise test after coronavirus-disease pneumonia.

This is a case series of only two patients, so it cannot establish whether the treatment works or how well it works compared to standard care. The rehabilitation was a complex package of many different interventions (respiratory training, prone positioning, stretching, ergometer exercise), making it impossible to attribute the improvements specifically to the use of CPET for prescription. There was no control group, so natural recovery or other unmeasured factors could have contributed to the improvements. The study does not report blinding or randomisation, and the authors declare financial support without specifying the source, which raises potential conflicts of interest.

The authors declare that financial support was received for the research and/or publication of this article, but the specific source of funding is not detailed in the provided text.

Do not conclude that CPET-guided rehabilitation is superior to other forms of respiratory therapy. The patients received a broad package of interventions including prone positioning and specific respiratory muscle training, so the improvement cannot be attributed solely to the use of CPET for prescribing exercise intensity.