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Titolo:
EFFECTS OF BLOOD-VOLUME DISTRIBUTION ON THE CHARACTERISTICS OF THE CAROTID BAROREFLEX IN HUMANS AT REST AND DURING EXERCISE
Autore:
EIKEN O; SUN JCL; MEKJAVIC IB;
Indirizzi:
KAROLINSKA INST,HUDDINGE HOSP,DEPT CLIN PHYSIOL S-14186 HUDDINGE SWEDEN SIMON FRASER UNIV,SCH KINESIOL BURNABY V5A 1S6 BC CANADA
Titolo Testata:
Acta Physiologica Scandinavica
fascicolo: 1, volume: 150, anno: 1994,
pagine: 89 - 94
SICI:
0001-6772(1994)150:1<89:EOBDOT>2.0.ZU;2-3
Fonte:
ISI
Lingua:
ENG
Soggetto:
VASOCONSTRICTOR RESPONSES; BARORECEPTOR STIMULATION; ARTERIAL BAROREFLEX; CARDIOPULMONARY; PRESSURE; REFLEXES; SINUS; DOGS; SENSITIVITY;
Keywords:
ARTERIAL BAROREFLEX; BARORECEPTOR INTERACTION; EXERCISE; PRESSURE-RESPONSE RELATION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
33
Recensione:
Indirizzi per estratti:
Citazione:
O. Eiken et al., "EFFECTS OF BLOOD-VOLUME DISTRIBUTION ON THE CHARACTERISTICS OF THE CAROTID BAROREFLEX IN HUMANS AT REST AND DURING EXERCISE", Acta Physiologica Scandinavica, 150(1), 1994, pp. 89-94

Abstract

Seven supine subjects were studied at rest and during mild to moderate dynamic leg exercise with and without unloading of the cardiopulmonary baroreceptors accomplished by exposing the lower portion of the body to a subatmospheric pressure of 20 mmHg (Lower Body Negative Pressure, LBNP). The function of the cardiac branch of the carotid baroreflexwas studied over its full operational range by measuring R-R intervals during application of pulse synchronous graded pressures (40 to -65 mmHg) in a neck-chamber device. Raising the carotid transmural pressure (systolic arterial pressure minus neck-chamber pressure) induced increasing R-R intervals in all conditions. In conformity with previous results from our laboratories it was found that the maximal rate of change in relative R-R intervals and the corresponding transmural pressure were higher during exercise than at rest, indicating that exercise increased the carotid baroreflex sensitivity and shifted its optimal buffering range to higher arterial pressures. LBNP did not affect the characteristics of the reflex at rest nor during exercise. It is concluded that reduced central venous pressure with consequent selective cardiopulmonary receptor disengagement exerts no influence on the carotid baroreflex control of heart rate (HR), as tested over the entire arterial pressure-effector response relation, either at rest or during mild-moderate exercise.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 28/09/20 alle ore 12:11:56