The role of adrenaline as a modulator of cardiac performance in two Antarctic fishes

Publication: Research - peer-reviewJournal article – Annual report year: 2008

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  • Author: Skov, Peter Vilhelm

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  • Author: Bushnell, Peter G.

  • Author: Tirsgaard, Bjørn

  • Author: Steffensen, John Fleng

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The present work was performed to test the hypothesis that Antarctic teleosts rely mostly on cholinergic inhibition for autonomic modulation of the heart. The effects of adrenaline on the inotropic properties on paced, isometrically contracting muscle strips were examined in two distinct Antarctic teleosts, the haemoglobinless icefish Chaenocephalus aceratus and the red-blooded Notothenia coriiceps. All tissues examined revealed a negative force-frequency relationship. Under baseline conditions C. aceratus contracted with a force twice as great as that of N. coriiceps. While the degree to which ventricular tissues responded to adrenaline varied between species, adrenergic stimulation significantly increases myocyte contraction force in this group of fishes. Contraction and relaxation times were not significantly affected by adrenaline concentration while absolute rates of contraction were. Adrenergic stimulation does not enable tissues to achieve higher contraction frequencies, but is shown to be a potent modulator of contraction force.
Original languageEnglish
JournalPolar Biology
Publication date2008
Volume32
Journal number2
Pages215-223
ISSN0722-4060
DOIs
StatePublished
CitationsWeb of Science® Times Cited: 2
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