TY JOUR TI RELATIONSHIP OF SPEED AND STRENGTH QUALITIES WITH POWER SUPPLY MECHANISMS ATHLETES KW speed and strength qualities KW sprinter athletes KW energy-supplying mechanism KW testing KW power KW training JO Scientific notes of P. F. Lesgaft University AU TSygankina, N.E. AU Borisova, T.V. AU Gertner, S.V. PY 2023 IS 0 PB National State University of Physical Education, Sports and Health named after P.F. Lesgaft