Cardiorespiratory coupling in the bottlenose dolphin (Tursiops truncatus).
Front Physiol
; 14: 1234432, 2023.
Article
de En
| MEDLINE
| ID: mdl-37811493
ABSTRACT
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.
Texte intégral:
1
Collection:
01-internacional
Base de données:
MEDLINE
Langue:
En
Journal:
Front Physiol
Année:
2023
Type de document:
Article
Pays d'affiliation:
Espagne