title: Dependence of structure of the cardiac rhythm on physical working capacity of athletes.
mesh_terms: D000328:Adult; D004562:Electrocardiography; D006321:Heart / Q000294:innervation; D006339:Heart Rate; D006801:Humans; D008297:Male; D009200:Myocardial Contraction; D010100:Oxygen / Q000097:blood; D010807:Physical Endurance; D005082:Physical Exertion; D012119:Respiration; D013177:Sports; D013564:Sympathetic Nervous System / Q000502:physiology*; D014630:Vagus Nerve / Q000502:physiology*
chemical_list: D010100:Oxygen