Dissociation of bradycardia and arterial constriction during diving in the seal phoca vitulina

H. V. Murdaugh, Carroll E Cross, J. Eugene Millen, J. Bernard L Gee, Eugene D. Robin

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

Bradycardia associated with diving in the harbor seal has been dissociated from the arterial constrictor response by intracardiac pacing. Development of arterial constriction does not depend upon the development of bradycardia. During pacing, arterial constriction continues in the absence of bradycardia. Increases in heart rate to values greater than 120 beats per minute during a dive produce a progressive decrease in mean aortic pressure, which suggests that one major function of bradycardia is to reduce cardiac output, thus matching left ventricular output to the restricted vascular bed and decreased venous return associated with diving.

Original languageEnglish (US)
Pages (from-to)364-365
Number of pages2
JournalScience
Volume162
Issue number3851
StatePublished - 1968

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Phoca
Diving
Bradycardia
Constriction
Cardiac Output
Blood Vessels
Arterial Pressure
Heart Rate

ASJC Scopus subject areas

  • General

Cite this

Murdaugh, H. V., Cross, C. E., Millen, J. E., Gee, J. B. L., & Robin, E. D. (1968). Dissociation of bradycardia and arterial constriction during diving in the seal phoca vitulina. Science, 162(3851), 364-365.

Dissociation of bradycardia and arterial constriction during diving in the seal phoca vitulina. / Murdaugh, H. V.; Cross, Carroll E; Millen, J. Eugene; Gee, J. Bernard L; Robin, Eugene D.

In: Science, Vol. 162, No. 3851, 1968, p. 364-365.

Research output: Contribution to journalArticle

Murdaugh, HV, Cross, CE, Millen, JE, Gee, JBL & Robin, ED 1968, 'Dissociation of bradycardia and arterial constriction during diving in the seal phoca vitulina', Science, vol. 162, no. 3851, pp. 364-365.
Murdaugh, H. V. ; Cross, Carroll E ; Millen, J. Eugene ; Gee, J. Bernard L ; Robin, Eugene D. / Dissociation of bradycardia and arterial constriction during diving in the seal phoca vitulina. In: Science. 1968 ; Vol. 162, No. 3851. pp. 364-365.
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