Clinically stable individuals, residing in Manaus must have been diagnosed with COVID-19 by the polymerase chain reaction method (RT-PCR) for SARS-CoV-2, remained hospitalized and had discharged from the hospital. In addition, volunteers must present a pre-hospitalization medical history of clinical stability in the 4 months before hospitalization for COVID-19 and perception of dyspnea II and III by the Medical Research Council (MRC).

Clinically stable individuals, residing in Manaus must have been diagnosed with COVID-19 by the polymerase chain reaction method (RT-PCR) for SARS-CoV-2, remained hospitalized and had discharged from the hospital. In addition, volunteers must present a pre-hospitalization medical history of clinical stability in the 4 months before hospitalization for COVID-19 and perception of dyspnea II and III by the Medical Research Council (MRC).