Effect of orbital flight on the duration of the cardiac cycle and of its phases.
D000337:Aerospace Medicine; D001145:Arrhythmias, Cardiac / Q000453:epidemiology; D004562:Electrocardiography; D006321:Heart / Q000502:physiology*; D006329:Heart Conduction System / Q000502:physiology; D006339:Heart Rate; D006801:Humans; D008297:Male; D010701:Phonocardiography; D013026:Space Flight; D013564:Sympathetic Nervous System / Q000502:physiology; D013997:Time Factors; D014481:United States