The subject of the project is the impact of COVID-19 on the exercise capacity ofpatients. The long-term sequelae of COVID-19 infection are still unknown. It is not yetclear whether pulmonary sequelae, which may be a consequence of the disease, areassociated with a measurable functional deficit. In this project, the aerobic capacity ofhealthy people will be compared with individuals who have experienced Covid-19, and theamount of increase in aerobic capacity will be determined at the end of 15 sessions byapplying a rehabilitation program including bicycle ergometry to individuals who haveexperienced Covid-19 Detailed description : In December 2020, in the pneumonia epidemicin which the city of Wuhan, China is the center, pneumonia developed due to the newlydefined SARS-CoV-2 factor was defined as Coronavirus disease 2019 (COVID-19). It has beenobserved that clinical findings of SARS-CoV-2 infection in patients hospitalized in Wuhanrange from mild manifestations such as asymptomatic disease and mild upper respiratorytract infection to severe viral pneumonia accompanied by respiratory failure and mayresult in death.The long-term sequelae of COVID19 are still unknown. Pulmonary sequelaethat impair physical fitness have been predominantly defined for hospitalized patientswith COVID-19. Although lung lesions have been identified as asymptomatically in infectedindividuals, it is not yet clear whether these observations are related to a measurablefunctional deficit in physical fitness. They measured the change in the predicted maximumaerobic capacity (VO2 max) of non-infected,asymptomatically infected, and recoveringCOVID-19 individuals with a well-established and validated physical fitness test beforeand after the COVID-19 outbreak among young Swiss adults.They demonstrated decreasedaerobic capacity in young adults 1 to 2 months after symptomatic COVID-19 withoutphysical strength being affected. In their study, 19% of young adults who recovered afterCOVID-19 had a VO2 max decrease of more than 10% compared to baseline before infection.It has been identified that decreased VO2 max value is the hallmark of interstitial lungdisease. SARS-CoV-2 infection causes lung damage even in asymptomatic cases.A total of 64 people, including 32 people in 2 groups between the ages of 18-55, who haveor have not had corona virus infection, who applied to Bülent Ecevit University Facultyof Medicine Physical Therapy and Rehabilitation or Infectious Diseases outpatient clinicsfor different reasons, will be included in our project. The research start date isFebruary 2021 and the end date is February 2023. At the beginning of the study,demographic information of the individuals such as gender, age,height, weight,occupation, education, body mass index, physical activity level (international physicalactivity index-IPAQ), the most used hand (dominant hand) in daily life activities will berecorded. In the control group, resting heart rate, blood pressure, saturationmeasurement, ECG will be performed before exercise. In addition, in order to evaluatetheir muscle strength, microFET3 manual muscle measurement device will be used to measurethe triceps muscle strength in the upper extremity they actively use, and the quadricepsmuscle strength of the same side will be measured, and their grip strength will bemeasured with the JAMAR hydraulic hand dynamometer. Using the international physicalactivity index(IPAQ), activity status in daily life will be assessed. The exercisecapacity of all individuals will be measured with the aid of the COSMED Quark CPET deviceusing the bicycle ergometry test recommended by the American Society of Cardiovascularand Pulmonary Rehabilitation. In this test, submaximal exercise test will be performed byproviding 25 W increase in 2 minutes periods after the warm-up period at 0 load (W) for 2minutes. In addition, the borg scale obtained at the end of the test, metabolicequivalent of task (MET) and maximum work (W), test duration, maximum heart rateparameters will also be recorded in order to evaluate the exercise capacity.Individuals who have been confirmed by the previous SARS-COV 2 real-time reversetranscriptase polymerase chain reaction (RT-PCR) test to have coronovirus infection afterthe test will be included in a treatment program of 15 sessions, at least 3 sessions perweek, with bicycle ergometry. After 15 sessions, exercise capacity will be re-evaluatedusing the cycling test, the aforementioned triceps and grip muscle strengths, V02 max,maximum conjugate (MET), maximum work (w), borg scale, maximum heart rate, test timeparameters will be saved again after treatment.