TY JOUR TI Monitoring the effectiveness of competitive activities of highly qualified taekwondo athletes using physiological markers KW taekwondo KW heart rate variability KW athlete's functional state KW sports physiology JO Scientific notes of P. F. Lesgaft University AU Mel'nikov, D.S. AU Seliverstova, V.V. AU Shchedrina, Y.A. AU Pavlenko, A.V. PY 2025 IS 0 PB National State University of Physical Education, Sports and Health named after P.F. Lesgaft