TY JOUR TI HEART RATE REGULATION IN STUDENTS IN DIFFERENT PERIODS OF TRAINING KW adaptation KW stress at work KW vegetative regulation KW students KW cardio rhythm KW diurnal performance JO Bulletin of Kemerovo State University. Series: Biological, Engineering and Earth Sciences AU Fedorov, A.I. AU Zarchenko, P.I. AU Ponomareva, V.S. AU Nemolochnaia, N.V. PY 2017 IS 2017 PB Kemerovo State University