title: Effects of normal breathing and expiratory apnea on duration of the phases of cardiac systole.
mesh_terms: D000368:Aged; D001049:Apnea / Q000503:physiopathology*; D002302:Cardiac Output; D003327:Coronary Disease / Q000503:physiopathology*; D004562:Electrocardiography; D005260:Female; D006334:Heart Function Tests; D006339:Heart Rate; D006801:Humans; D008297:Male; D008875:Middle Aged; D009203:Myocardial Infarction / Q000503:physiopathology; D010701:Phonocardiography; D012119:Respiration