[Echocardiographic determination of left ventricular function during isometric muscle exertion and the Valsalva maneuver].
Left ventricular dimensions and function were estimated in 11 healthy volunteers by means of echocardiography during isometric exercise and the Valsalva manoeuvre. Isometric exercise induces a rise of heart rate and Vcf by 14% and of cardiac output as well as of the cardiac index by 12%. Stroke volume remains unchanged. During Valsalva's manoeuvre a marked decrease in left ventricular dimensions is observed. A reduction of the stroke volume by 29% was not compensated by increasing heart rate. However, cardiac output and cardiac index is found 10% below control values.
D000328:Adult; D001794:Blood Pressure; D002302:Cardiac Output; D002306:Cardiac Volume; D004452:Echocardiography; D006339:Heart Rate; D006801:Humans; D007537:Isometric Contraction; D008297:Male; D009200:Myocardial Contraction; D005082:Physical Exertion; D013318:Stroke Volume; D014636:Valsalva Maneuver; D016276:Ventricular Function
Echokardiographische Beurteilung der linksventrikulären Funktion während isometrischer Muskelarbeit und der Valsalvaschen Pressdruckprobe.