00790naa#a2200193#i#450# EN\\bibl\116946 20260430154015.4 1994-4683 20260429b2026####ek#y0engy0150####ca RU Psychological factors of sports motivation in student-athletes: systematization and analysis of their influence on the effectiveness of training and competitive activity Journal article Moscow National State University of Physical Education, Sports and Health named after P.F. Lesgaft 2026 8 с. Journal article local Психология. 159.9 Mokeeva Lyudmila Alekseevna Mikhailova Olga Nikolaevna Golovina Lyudmila Gennadievna uchzapiski.lesgaft.spb.ru