Postprandial cardiorespiratory responses and the regulation of digestion-associated tachycardia in Nile tilapia (Oreochromis niloticus)

Guagnoni, Igor Noll; Armelin, Vinicius Araújo; Braga, Victor Hugo da Silva; Rantin, Francisco Tadeu; Florindo, Luiz Henrique

doi:10.1007/s00360-020-01317-x

Search citation statements

Order By: Relevance

Paper Sections

Select...

Citation Types

Supporting

Mentioning

Contrasting

Year Published

2024

Publication Types

Select...

Article2

Book1

Relationship

Self Cite0

Independent3

Authors

Journals

Cited by 3 publications

References 77 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

Integrated responses of the circulatory system to digestion

Joyce,

Brijs

2024

Encyclopedia of Fish Physiology

View full text Add to dashboard Cite

Integrated responses of the circulatory system to digestion

Joyce,

Brijs

2024

Encyclopedia of Fish Physiology

View full text Add to dashboard Cite

The pancreas does not contribute to the non-adrenergic-non-cholinergic stimulation of heart rate in digesting pythons

Guagnoni,

Last,

Rindom

et al. 2024

Comparative Biochemistry and Physiology Part A: Molecular &

View full text Add to dashboard Cite

Cardiovascular responses and the role of the neurohumoral cardiac regulation during digestion in the herbivorous lizard Iguana iguana

Guagnoni,

Armelin,

da Silva Braga

et al. 2024

Journal of Experimental Biology

View full text Add to dashboard Cite

Carnivorous reptiles exhibit an intense metabolic increment during digestion, which is accompanied by several cardiovascular adjustments responsible for supplying the physiological demands of the gastrointestinal system. Postprandial tachycardia, a well-documented phenomenon in these animals, is mediated by the withdrawal of vagal tone associated with the chronotropic effects of non-adrenergic and non-cholinergic (NANC) factors. However, herbivorous reptiles exhibit a modest metabolic increment during digestion and there is no information about postprandial cardiovascular adjustments. Considering the significant impact of feeding characteristics on physiological responses, we investigated cardiovascular and metabolic responses, as well as the neuro-humoral mechanisms of cardiac control, in the herbivorous lizard Iguana iguana during digestion. We measured oxygen consumption (VO2), heart rate (fH), mean arterial blood pressure (MAP), myocardial activity, cardiac autonomic tone, fH/MAP variability, and baroreflex efficiency in both fasting and digesting animals before and after parasympathetic blockade with atropine followed by double autonomic blockade with atropine and propranolol. Our results revealed that the peak of VO2 in iguanas was reached 24 h after feeding, accompanied by an increase in myocardial activity and a subtle tachycardia mediated exclusively by a reduction in cardiac parasympathetic activity. This represents the first reported case of postprandial tachycardia in digesting reptiles without the involvement of NANC factors. Furthermore, this withdrawal of vagal stimulation during digestion may reduce the regulatory range for short-term fH adjustments, subsequently intensifying the blood pressure variability as a consequence of limiting baroreflex efficiency.

show abstract

Postprandial cardiorespiratory responses and the regulation of digestion-associated tachycardia in Nile tilapia (Oreochromis niloticus)

Cited by 3 publications

References 77 publications

Integrated responses of the circulatory system to digestion

Integrated responses of the circulatory system to digestion

The pancreas does not contribute to the non-adrenergic-non-cholinergic stimulation of heart rate in digesting pythons

Cardiovascular responses and the role of the neurohumoral cardiac regulation during digestion in the herbivorous lizard Iguana iguana

Contact Info

Product

Resources

About