TY JOUR TI Determination of sufficient values of maximum oxygen consumption in assessing the functional preparedness of cross-country skiers KW cross-country skiing KW functional preparedness KW aerobic energy supply factors KW maximum oxygen consumption KW model values JO Scientific notes of P. F. Lesgaft University AU Ardashev, A.E. AU Sergeyev, V.G. AU Chuchkov, V.M. PY 2025 IS 0 PB National State University of Physical Education, Sports and Health named after P.F. Lesgaft