Funding: the article was prepared as part of the applied research work "Investigation of the impact of COVID-19 on health and functional state of elite athletes and development of methodological recommendations for examination of athletes, including minors, before allowing them to train and compete after COVID-19, with the aim to ensure restoration of their health and functional state" (code "COVID-22"); the work is done by the Federal Research and Clinical Center of Sports Medicine and Rehabilitation of Federal Medical Biological Agency of Russia under state contract № 107.003.22.14 of July 25, 2022.

Author contributions: LA Balykova — development of the concept, text authoring, editing; AV Zholinsky — development of the concept, editing; MS Tarasova, MV Shirmankina, ZhV Grishina — search for and analysis of sources, text authoring; SA Ivyanskiy, RA Bespalov — search for and analysis of sources, development of the mathematical modeling tool, text authoring; SA Bazanovich — definition of approaches to mathematical modeling and their optimization; PV Efimov — search for and analysis of sources, definition of approaches to mathematical modeling and their optimization, text authoring; SA Parastaev — search for and analysis of sources, editing.