TY JOUR TI Features of recovery of cross-country skiers and team sports athletes of different ages after intense physical exertion KW sports physiology KW load testing KW heart rate KW recovery KW age-related characteristics KW skiing races KW team sports KW training process JO Scientific notes of P. F. Lesgaft University AU Zakharova, A.V. AU Elsner, N.V. PY 2025 IS 0 PB National State University of Physical Education, Sports and Health named after P.F. Lesgaft