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Article History

Received: 11 April 2022

Revised: 3 June 2022

Accepted: 10 June 2022

First Online: 6 April 2023

COMPLIANCE WITH ETHICAL STANDARDS

: All studies were carried out in accordance with the principles of biomedical ethics formulated in the Declaration of Helsinki of 1964 and its subsequent updates and approved by the local bioethical committee of the Velikiye Luki State Academy of Physical Culture and Sports (Velikiye Luki) (Protocol no. 2, dated September 6, 2021).

: <i>Informed consent.</i> Each participant in the study provided a voluntary written informed consent signed by him after explaining to him the potential risks and benefits, as well as the nature of the upcoming study.

: <i>Conflict of interest</i>. The authors declare no obvious or potential conflict of interest related to the publication of this article.

: <i>Contribution of authors to the publication.</i> S.A. Moiseev—organized the research, processed and analyzed the data, reviewed the research on the topic, and worked on the text of the manuscript. R.M. Gorodnichev performed general supervision of research and work on the text of the manuscript.