Age ≥ 18 years

Patients with persistent symptoms 3 months after the onset of Covid-19 infection, regardless the severity of the initial illness

Patients with an ICU stay, primarily following rehabilitation management; that is, in practice, at least 6 months after COVID

Patients followed by a pulmonologist, cardiologist or physiologist in a public or private facility or in private practice, allowing for CPET

Patients who have performed a CPET before December 31, 2023

Patients informed of the possible anonymized processing of the data collected during CPET for research purposes; and who gave informed consent

Responses to CPET in Subjects With Persistent Exercise Intolerance After COVID-19: an Open-Source Exercise Network