TY JOUR TI Systemic regulatory and legal difficulties of sports training of athletes with musculoskeletal disorder KW sports training KW athletes with musculoskeletal disorder KW elite sports JO Scientific notes of P. F. Lesgaft University AU Voroshin, I.N. AU Zaiko, D.S. AU Dmitriev, I.V. AU Mironov, A.A. PY 2025 IS 0 PB National State University of Physical Education, Sports and Health named after P.F. Lesgaft