title: [Study on transitional processes of the regulation of the heart rate in man exposed to strenuous muscular activity].
abstract: Physical work (gradually increasing from initial 20 W + additional 20 W each minute up to the moment of failure to perform any work) was performed by 38 sportsmen and 35 non-sportsmen aged 18-25. The cardiac rhythm was registered based on two parameters: the heart rate and heart rate dispersion. The urgent adaptation to strenuous muscular activity characterizes the transitional process of an open outline of the cardiac rhythm regulation. The transitional process revealed in 26% of sportsmen is a closed system of the heart rhythm regulation. The same process, revealed in 6% or non-sportsmen, is a combined tepe of regulation which includes elements of both open and closed types of regulation of the cardiac rhythm.
authors.forename: H V
authors.initials: HV
authors.lastname: Korobeĭnikov
mesh_terms: D000222:Adaptation, Physiological; D000293:Adolescent; D000328:Adult; D016022:Case-Control Studies; D004562:Electrocardiography; D006339:Heart Rate / Q000502:physiology*; D006801:Humans; D009200:Myocardial Contraction / Q000502:physiology*; D010809:Physical Fitness / Q000502:physiology*; D013177:Sports / Q000502:physiology*
vernacular_title: Doslidzhennia perekhidnykh protsesiv rehuliatsiĭ rytmu sertsia u liudyny za umov napruzhenoĭ míazevoĭ diialńosti.