TY JOUR TI CHOICE OF ALTITUDE ABOVE SEA LEVEL FOR A TRAINING EVENT AT THE STAGE OF DIRECT PREPARATION FOR THE START AS ONE OF THE FACTORS DETERMINING THE SPORTS RESULT KW biathlon KW world cup stages KW height above sea level KW stage of direct preparation for the start KW biathletes of the russian national team KW place in speed KW final result in biathlon JO Scientific notes of P. F. Lesgaft University AU Romanova, Y.S. AU Zagurskiy, N.S. AU Lenkova, S.A. PY 2023 IS 0 PB National State University of Physical Education, Sports and Health named after P.F. Lesgaft