%0 Journal Article %T FUNCTIONAL TRAINING OF MIDDLE DISTANCE RUNNERS, PROSPECTS FOR THE DEVELOPMENT OF ENERGY POTENTIAL %A Mastrov, A.V. %A Konovalov, I.E. %A Brovkin, A.P. %K middle-distance runners, functional training, blood lactate, experimental mode of running load %J Scientific notes of P. F. Lesgaft University %D 2023 %N 0 %P 5 %I National State University of Physical Education, Sports and Health named after P.F. Lesgaft