TY JOUR TI Predicting functional status in football players: reference range, normative values, and standardization of the Hooper index KW football KW athletic reserve KW functional state KW aerobic capacity KW heart rate KW hooper index KW sports forecasting JO Scientific notes of P. F. Lesgaft University AU Golubev, D.V. PY 2026 IS 0 PB National State University of Physical Education, Sports and Health named after P.F. Lesgaft