title: [Method for studying deviations from the normal duration of the cardiac cycle].
mesh_terms: D002309:Cardiology / Q000295:instrumentation*; D004582:Electronics, Medical / Q000295:instrumentation; D006339:Heart Rate; D006801:Humans; D005222:Mental Fatigue / Q000503:physiopathology; D013997:Time Factors; D014586:USSR
vernacular_title: Metod issledovaniia otkloneniĭ ot normal'noĭ prodolzhitel'nosti serdechnogo tsikla