TY JOUR TI Analysis of biomechanical prerequisites for foot deformations in young hockey players KW ice hockey KW initial sports training KW flexible flatfoot KW foot deformities JO Scientific notes of P. F. Lesgaft University AU Nenenko, N.D. AU Sysoeva, Y.V. AU Efimova, P.D. PY 2026 IS 0 PB National State University of Physical Education, Sports and Health named after P.F. Lesgaft