The patient has been discharged from the hospital for a week. over 18 years of age In the past 6 months, he has not suffered from any other acute illness except for Covid-19. The patient does not have Chronic obstructive pulmonary disease or other respiratory diseases. The participant's forced expiratory volume in 1s must be above 70%. (The recovered patient does not have severe respiratory restriction and is able to participate in the study) The patient has been discharged from the hospital for a week

The patient has been discharged from the hospital for a week. over 18 years of age In the past 6 months, he has not suffered from any other acute illness except for Covid-19. The patient does not have Chronic obstructive pulmonary disease or other respiratory diseases. The participant's forced expiratory volume in 1s must be above 70%. (The recovered patient does not have severe respiratory restriction and is able to participate in the study) The patient has been discharged from the hospital for a week