Cardiovascular alterations and autonomic imbalance in an experimental model of depression.
Depressed patients with and without a history of cardiovascular pathology display signs, such as elevated heart rate, decreased heart rate variability, and increased physiological reactivity to environmental stressors, which may indicate a predisposition to cardiovascular disease. The specific physiological mechanisms associating depression with such altered cardiovascular parameters are presently unclear. The current study investigated cardiovascular regulation in the chronic mild stress rodent model of depression and examined the specific autonomic nervous system mechanisms underlying the responses. Sprague-Dawley rats exposed to a series of mild, unpredictable stressors over 4 wk displayed anhedonia (an essential feature of human depression), along with elevated resting heart rate, decreased heart rate variability, and exaggerated pressor and heart rate responses to air jet stress. Results obtained from experiments studying autonomic blockade suggest that cardiovascular alterations in the chronic mild stress model are mediated by elevated sympathetic tone to the heart. The present findings have implications for the study of pathophysiological links between affective disorders and cardiovascular disease.
Grippo
Angela J
AJ
Department of Psychology, University of Iowa, Iowa City, Iowa 52242, USA.
Moffitt
Julia A
JA
Johnson
Alan Kim
AK
D000818:Animals; D001341:Autonomic Nervous System / Q000503:physiopathology*; D001794:Blood Pressure; D002319:Cardiovascular System / Q000503:physiopathology*; D002755:Choice Behavior; D002908:Chronic Disease; D003863:Depression / Q000503:physiopathology* / Q000523:psychology; D006329:Heart Conduction System / Q000503:physiopathology; D006339:Heart Rate; D006439:Hemodynamics; D008297:Male; D010812:Physical Stimulation; D051381:Rats; D017207:Rats, Sprague-Dawley; D012996:Solutions; D013312:Stress, Physiological / Q000503:physiopathology / Q000523:psychology; D013395:Sucrose
D012996:Solutions; D013395:Sucrose