The intended size of group - 100 subjects (50 subjects - study group, 50 subjects - control group). The above population was determined based on sample size calculator, with the following parameters: fraction size of 0.9, Confidence Interval of 95%, maximum error of 9%. The proper study will be preceded with a pilot study involving a smaller group of subjects (in order to standardise the surveys, and minimise the relationship between the results of the survey and side-effect factors). After inclusion and exclusion criteria are considered, the subjects will be allocated into two groups:~study group (subjects who had tested positive and recovered from COVID-19)~control group (healthy subjects who did not have COVID-19). The controls will be matched to the study group for gender and age.~The examination will be performed once, at the premises of the University of Rzeszów. The participants' condition will be assessed using the following measures:~static and dynamic balance and risk of falls (force plate and computerised posturography, clinical tests)~activity in the cerebral cortex of the frontal lobe during focused performance of a task (Hemoencephalography HEG-System)~concentration and attention, memory and cognitive functions (Bourdon-Wiersma test and Auditory-Verbal Learning Test)~gait velocity and efficiency (10-meter walk test and 6-minute walk test)~physical activity (International Physical Activity Questionnaire IPAQ), as well as education, mood, and social contacts (specially designed questionnaire)~quality of life (SF-36 questionnaire)
The research will make it possible to assess patients who recovered from COVID-19 for the incidence of neurological problems (impaired balance, gait, coordination, concentration and attention), and changes in the quality of life, physical activity, social contacts and education.