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Article dans une revue Frontiers in Physiology Année : 2023

Cardiorespiratory coupling in the bottlenose dolphin ( Tursiops truncatus)

Résumé

Introduction: The bottlenose dolphin (Tursiops truncatus) is an intermittent breather, where the breath begins with an exhalation followed by inhalation and an extended inter-breath interval ranging from 10 to 40 s. Breathing has been shown to alter both the instantaneous heart rate (if H) and stroke volume (iSV) in the bottlenose dolphin, with a transitory ventilatory tachycardia following the breath, and an exponential decrease to a stable if H around 40 beats • min-1 during the inter-breath period. As the total breath duration in the dolphin is around 1 s, it is not possible to assess the contribution of exhalation and inhalation to these changes in cardiac function during normal breathing. Methods: In the current study, we evaluated the if H response by separating expiration and inspiration of a breath, which allowed us to distinguish their respective contribution to the changes in if H. We studied 3 individual male bottlenose dolphins trained to hold their breath between the different respiratory phases (expiration and inhalation). Results: Our data show that inspiration causes an increase in if H, while expiration appears to result in a decrease in if H. Discussion: These data provide improved understanding of the cardiorespiratory coupling in dolphins, and show how both exhalation and inhalation alters if H.
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Origine : Publication financée par une institution
Licence : Paternité - CC BY 4.0
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Dates et versions

hal-04272456, version 1 (08-11-2023)

Licence

Paternité - CC BY 4.0

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A. Fahlman, J. Mcknight, A. Blawas, N. West, Angelo Torrente, et al.. Cardiorespiratory coupling in the bottlenose dolphin ( Tursiops truncatus). Frontiers in Physiology, 2023, 14, pp.1234432. ⟨10.3389/fphys.2023.1234432⟩. ⟨hal-04272456⟩
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