Independent effects of heart rate and exercise on left ventricular wall movement measured by reflected ultrasound.
D000328:Adult; D004452:Echocardiography; D006325:Heart Atria; D006339:Heart Rate; D006801:Humans; D008875:Middle Aged; D009068:Movement; D010138:Pacemaker, Artificial; D005082:Physical Exertion; D014463:Ultrasonography; D016276:Ventricular Function