Respiratory and cardiovascular system responses to hypoxia in blue and green-winged teal

G. E. Tempel, Roderick Suthers

Research output: Contribution to journalArticle

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Abstract

Previous studies of the blood of the teal suggested possible mechanisms which would enable flight at high altitude. Investigations of the animal's oxygen consumption (VO2), respiratory rate, tidal volume, and cardiac output (CO) were made to provide further information on hypoxic resistance. VO2, determined by the open circuit method, increased in the blue winged teal (BW) 40% from a normoxic value of .96 ml (g.hr)-1 to 1.32 ml (g.hr)-1 at a PO2 = 73 mm Hg. VO2 of the green winged (GW) increased 45% from 0.92 ml (g.hr)-1 to 1.43 ml (g.hr)-1. Respiratory rate of BW was unchanged by hypoxia from its normoxic value of 42 breath (min)-1. There is, however, nearly a 35% increase in ventilation brought about by an increase in tidal volume from a normoxic value of .006 ml (g.breath)-1 to .01 ml (g.breath)-1. CO, assisted by the Fick method for both species, was .34 l (kg.min)-1 under normoxic conditions, with a stroke volume of 1.4 ± .2 ml (kg)-1 at a heart rate of approximately 245 beats (min)-1. Reduction of the PO2 was without demonstrable effect on cardiac frequency; however, CO showed a slight decrease to 0.23 l (kg.min)-1 with a stroke volume of 1.2 ± .1 ml (kg)-1. The data suggest these species respond to hypoxia by increasing pulmonary ventilation with little alteration in cardiovascular system function.

Original languageEnglish (US)
JournalFederation Proceedings
Volume36
Issue number3
StatePublished - 1977
Externally publishedYes

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Cardiovascular System
Cardiac Output
Respiratory System
Tidal Volume
Respiratory Rate
Stroke Volume
Pulmonary Ventilation
Oxygen Consumption
Ventilation
Heart Rate
Hypoxia

ASJC Scopus subject areas

  • Medicine(all)

Cite this

Respiratory and cardiovascular system responses to hypoxia in blue and green-winged teal. / Tempel, G. E.; Suthers, Roderick.

In: Federation Proceedings, Vol. 36, No. 3, 1977.

Research output: Contribution to journalArticle

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abstract = "Previous studies of the blood of the teal suggested possible mechanisms which would enable flight at high altitude. Investigations of the animal's oxygen consumption (VO2), respiratory rate, tidal volume, and cardiac output (CO) were made to provide further information on hypoxic resistance. VO2, determined by the open circuit method, increased in the blue winged teal (BW) 40{\%} from a normoxic value of .96 ml (g.hr)-1 to 1.32 ml (g.hr)-1 at a PO2 = 73 mm Hg. VO2 of the green winged (GW) increased 45{\%} from 0.92 ml (g.hr)-1 to 1.43 ml (g.hr)-1. Respiratory rate of BW was unchanged by hypoxia from its normoxic value of 42 breath (min)-1. There is, however, nearly a 35{\%} increase in ventilation brought about by an increase in tidal volume from a normoxic value of .006 ml (g.breath)-1 to .01 ml (g.breath)-1. CO, assisted by the Fick method for both species, was .34 l (kg.min)-1 under normoxic conditions, with a stroke volume of 1.4 ± .2 ml (kg)-1 at a heart rate of approximately 245 beats (min)-1. Reduction of the PO2 was without demonstrable effect on cardiac frequency; however, CO showed a slight decrease to 0.23 l (kg.min)-1 with a stroke volume of 1.2 ± .1 ml (kg)-1. The data suggest these species respond to hypoxia by increasing pulmonary ventilation with little alteration in cardiovascular system function.",
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