Autonomic nervous control of postprandial hemodynamic changes at rest and upright exercise.
Postprandial hemodynamic changes were studied in healthy subjects at rest and during exercise in the upright position with and without autonomic blockade of the heart. At rest cardiac output increased 61% mostly because of a stroke volume increase accomplished by left ventricular end-diastolic dilation. These changes seemed to be dependent on the autonomic nervous system, whereas the postprandial heart rate increase did not. During exercise cardiac output was 23% higher after food intake due to a rise in both stroke volume and heart rate. These changes were apparently under influence of the autonomic nervous system, whereas left ventricular dilation was not. The present findings indicate that most of the postprandial changes in the central circulation are under control of the autonomic nervous system.
Department of Clinical Physiology and Nuclear Medicine, Herlev Hospital, Denmark.
H
H
Kelbaek
O
O
Munck
N J
NJ
Christensen
J
J
Godtfredsen
D000328:Adult; D001341:Autonomic Nervous System / Q000502:physiology*; D002302:Cardiac Output; D002395:Catecholamines / Q000097:blood; D004435:Eating; D005080:Exercise Test; D005260:Female; D006339:Heart Rate; D006801:Humans; D008297:Male; D013318:Stroke Volume
D002395:Catecholamines