Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
HEMODYNAMIC-EFFECTS OF ACUTE STRESSORS IN THE CONSCIOUS RABBIT
Autore:
SCHADT JC; HASSER EM;
Indirizzi:
UNIV MISSOURI,DEPT VET BIOMED SCI,DALTON CARDIOVASC RES CTR COLUMBIA MO 65211
Titolo Testata:
American journal of physiology. Regulatory, integrative and comparative physiology
fascicolo: 3, volume: 43, anno: 1998,
pagine: 814 - 821
SICI:
0363-6119(1998)43:3<814:HOASIT>2.0.ZU;2-Z
Fonte:
ISI
Lingua:
ENG
Soggetto:
DEFENSE REACTION; ELECTRICAL-STIMULATION; HYPOTHALAMIC DEFENSE; BARORECEPTOR REFLEX; VIGILANCE AREAS; RATS; MODULATION; RESPONSES;
Keywords:
STRESS; CARDIOVASCULAR CONTROL; REGIONAL BLOOD FLOW; DEFENSE REACTION; FREEZING BEHAVIOR; VIGILANCE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
25
Recensione:
Indirizzi per estratti:
Citazione:
J.C. Schadt e E.M. Hasser, "HEMODYNAMIC-EFFECTS OF ACUTE STRESSORS IN THE CONSCIOUS RABBIT", American journal of physiology. Regulatory, integrative and comparative physiology, 43(3), 1998, pp. 814-821

Abstract

Chronically instrumented, conscious rabbits were used to test the hypothesis that sensory stimulation with an airjet or oscillation produces differential hemodynamic changes that may be appropriate for an active or a passive behavioral response, respectively. Both stressors increased arterial pressure, central venous pressure, and hindquarters blood flow and produced visceral vasoconstriction. Neither stimulus altered hindquarters conductance. Although air jet increased heart rate andcardiac output, oscillation did not. The two stressors affected arterial baroreflex control of heart rate differently. Oscillation reset arterial pressure to a higher level with no change in heart rate maximumor minimum, whereas air jet reset both heart rate and arterial pressure to higher levels. Neither stressor affected baroreflex sensitivity We conclude that the conscious rabbit shows at least two distinct cardiovascular responses when exposed to acute stressors. Airjet produces a cardiovascular response including tachycardia, which resembles the defense reaction and appears appropriate for active defense or flight. The response to oscillation, on the other hand, appears better suited for a passive response such as ''freezing'' behavior. During exposure to either stressor, the baroreflex is altered to allow simultaneous increases in heart rate and arterial blood pressure, but the sensitivityis maintained, allowing normal moment to moment control of heart rate.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 25/09/20 alle ore 09:19:06