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The role of the autonomic nervous system in control of cardiac and air-breathing responses to sustained aerobic exercise in the African sharptooth catfish Clarias gariepinus 5
Blasco, Felipe R.; Mckenzie, David J.; Taylor, Edwin W.; Rantin, F. Tadeu.
Clarias gariepinus is a facultative air-breathing catfish that exhibits changes in heart rate (f(H)) associated with air breaths (AB). A transient bradycardia prior to the AB is followed by sustained tachycardia during breath-hold. This study evaluated air-breathing and cardiac responses to sustained aerobic exercise in juveniles (total length similar to 20 cm), and how exercise influenced variations in f(H) associated with AB. In particular, it investigated the role of adrenergic and cholinergic control in cardiac responses, and effects of pharmacological abolition of this control on air-breathing responses. Sustained exercise at 15, 30 and 45 cm s(-1) in a swim tunnel caused significant increases in f(AB) and f(H), from approximately 5 breaths h(-1) and...
Tipo: Text Palavras-chave: Adrenergic tone; Cholinergic tone; Heart rate; Swimming.
Ano: 2017 URL: https://archimer.ifremer.fr/doc/00367/47821/74728.pdf
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