[Periodic components of heart rate during mental work].
D006339:Heart Rate; D006801:Humans; D008606:Mental Processes; D010275:Parasympathetic Nervous System / Q000502:physiology; D010507:Periodicity; D012119:Respiration; D013564:Sympathetic Nervous System / Q000502:physiology
Chastota serdechnoi deiatel'nosti i ee perioaicheskie sostavlia-iushchie u liudei umstvennogo tryda v protsesse proizvodstvennoi deiatel'nosti.