Low cost of ventilation in the vagotomised alligator (Alligator mississippiensis).

Low cost of ventilation in the vagotomised alligator (Alligator mississippiensis). Research Abstract Details 

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Low cost of ventilation in the vagotomised alligator (Alligator mississippiensis). Abstract Text:

Nini Skovgaard,Tobias Wang,Nini Skovgaard,Tobias Wang,

Pulmonary ventilation requires energy, but the estimated costs of breathing in reptiles vary from 1 to 30% of resting metabolic rate. The low values have been estimated from changes in oxygen uptake during hypoxia or hypercapnia, but it remains possible that these treatments affected metabolism. We equipped alligators with masks for simultaneous measurements of ventilation and oxygen uptake during hypercapnia, hypoxia and bilateral vagotomy. Hypercapnia and hypoxia caused a marked increase in total ventilation, but oxygen uptake remained unchanged indicating a very low energetic cost of breathing. Upon vagotomy, breathing pattern changed to occasional and exceedingly deep breaths (76.1+/-11.1 ml kg(-1)) followed by buccal oscillations and shallower breaths (22.2+/-2.3 ml kg(-1)) interspersed between long non-ventilatory periods. This change in breathing pattern did not affect oxygen uptake. The duration of inspiration increased substantially upon vagotomy, so that inspiratory flow rate did not increase proportionally to tidal volume. These prolonged inspiratory times leads to less flow resistance and may explain that tidal volume could be increased substantially without a measurable energetic cost.

Low cost of ventilation in the vagotomised alligator (Alligator mississippiensis). Publishing Authors By Initials

N Skovgaard,T Wang,N Skovgaard,T Wang,

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Low cost of ventilation in the vagotomised alligator (Alligator mississippiensis). Journal Published:

PUBLICATION TYPE: Research Support, Non-U.S. Gov

Journal: Respiratory physiology & neurobiology

VOLUME: 159

Page Numbers: 28-33

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ISSN: 1569-9048

DAY: 7

MONTH: 05

YEAR: 2007

Low cost of ventilation in the vagotomised alligator (Alligator mississippiensis). Information

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LANGUAGE: eng

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Grant and Affiliation Information for Low cost of ventilation in the vagotomised alligator (Alligator mississippiensis).

AFFILIATION: Zoophysiology, Department of Biological Sciences, University of Aarhus, Denmark. Nini.jensen@biology.au.dk

Country: Netherlands

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MEDLINETA: Respir Physiol Neurobiol

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