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ECG

  • RESEARCH ARTICLE
    Activity, not submergence, explains diving heart rates of captive loggerhead sea turtles
    Cassondra L. Williams, Katsufumi Sato, Paul J. Ponganis
    Journal of Experimental Biology 2019 222: jeb200824 doi: 10.1242/jeb.200824 Published 24 April 2019

    Highlighted Article: Heart rates of undisturbed loggerhead sea turtles were not different whether turtles were submerged or out of water. Rather, heart rates changes were driven by turtles' activity level.

  • RESEARCH ARTICLE
    Exploring nature's natural knockouts: in vivo cardiorespiratory performance of Antarctic fishes during acute warming
    William Joyce, Stuart Egginton, Anthony P. Farrell, Elizabeth L. Crockett, Kristin M. O'Brien, Michael Axelsson
    Journal of Experimental Biology 2018 221: jeb183160 doi: 10.1242/jeb.183160 Published 13 August 2018

    Summary: Routine cardiac output in the haemoglobinless icefish Chaenocephalus aceratus is lower than previously reported; they have a large cardiorespiratory scope during acute warming and activity, and show the same cardiac breakpoint temperature as the red-blooded Antarctic fish Notothenia coriiceps.

  • METHODS & TECHNIQUES
    An improved method for detecting torpor entrance and arousal in a mammalian hibernator using heart rate data
    Amanda D. V. MacCannell, Ethan C. Jackson, Katherine E. Mathers, James F. Staples
    Journal of Experimental Biology 2018 221: jeb174508 doi: 10.1242/jeb.174508 Published 22 February 2018

    Summary: An increase in heart rate detects arousal from torpor long before body temperature changes in Ictidomys tridecemlineatus. Digitally filtered (Butterworth) heart rate data also detect entrance into torpor before body temperature changes.

  • RESEARCH ARTICLE
    Heart rate dynamics in a marsupial hibernator
    Steven J. Swoap, Gerhard Körtner, Fritz Geiser
    Journal of Experimental Biology 2017 220: 2939-2946; doi: 10.1242/jeb.155879

    Summary: Control and function of the cardiac system in the eastern pygmy possum during deep torpor is indistinguishable from that of a placental hibernator, and its dynamic heart rate range is one of the greatest measured to date at ∼600 beats min−1.

  • RESEARCH ARTICLES
    Deep-diving sea lions exhibit extreme bradycardia in long-duration dives
    Birgitte I. McDonald, Paul J. Ponganis
    Journal of Experimental Biology 2014 217: 1525-1534; doi: 10.1242/jeb.098558

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