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)
