Reference equations for the 6-minute walk distance in healthy Portuguese subjects 18–70 years old M.J. Oliveira, R. Marçôa, J. Moutinho, P. Oliveira, I. Ladeira, R. Lima, M. Guimarães

Prevalence of exercise-induced oxygen desaturation after recovery from SARS-CoV-2 pneumonia and use of lung ultrasound to predict need for pulmonary rehabilitation A. Carlucci, M. Paneroni, M. Carotenuto, E. Bertella, S. Cirio, A. Gandolfo, C. Simonelli, M. Vigna, C. Lastoria, A. Malovini, B. Fusar Poli, M. Vitacca

Test-retest reliability, construct validity and determinants of 6-minute walk test performance in adult patients with asthma R. Meys, S.M.J. Janssen, F.M.E. Franssen, A.W. Vaes, A.A.F. Stoffels, H.W.H. van Hees, B. van den Borst, P.H. Klijn, C. Burtin, A.J. van 't Hul, M.A. Spruit