A5031197602- Physiological and biochemical adaptations
- Neuroscience of respiration and sleep
- Heart Rate Variability and Autonomic Control
- Neurobiology and Insect Physiology Research
- High Altitude and Hypoxia
- Fish biology, ecology, and behavior
- Aquaculture Nutrition and Growth
- Meat and Animal Product Quality
- Zebrafish Biomedical Research Applications
- Non-Invasive Vital Sign Monitoring
- Memory and Neural Mechanisms
- Stress Responses and Cortisol
- Neuroscience and Neuropharmacology Research
- Fish Ecology and Management Studies
- Cardiovascular and exercise physiology
- Ocean Acidification Effects and Responses
Universidade Estadual Paulista (Unesp)
2014-2024
National Council for Scientific and Technological Development
2010-2024
Universidade Federal de São Carlos
2003-2024
Fundação de Amparo à Pesquisa do Estado de São Paulo
2010-2024
National Institute of Standards and Technology
2010-2015
The present study examined the role of branchial and orobranchial O(2) chemoreceptors in cardiorespiratory responses, aquatic surface respiration (ASR), development inferior lip swelling tambaqui during prolonged (6 h) exposure to hypoxia. Intact fish (control) three groups denervated (bilateral denervation cranial nerves IX+X (to gills), V+VII cavity) or V alone), were exposed severe hypoxia (Pw(O)2=10 mmHg) for 360 min. Respiratory frequency (fr) heart rate (fh) recorded simultaneously...
Carnivorous reptiles exhibit an intense metabolic increment during digestion, which is accompanied by several cardiovascular adjustments responsible for meeting the physiological demands of gastrointestinal system. Postprandial tachycardia, a well-documented phenomenon in these animals, mediated withdrawal vagal tone associated with chronotropic effects non-adrenergic and non-cholinergic (NANC) factors. However, herbivorous modest digestion there no information about postprandial...
The role of the parasympathetic nervous system, operating via vagus nerve, in determining heart rate (f(H)) and cardiorespiratory interactions was investigated neotropical fish Piaractus mesopotamicus. Motor nuclei branches cranial nerves VII, IX X, supplying respiratory muscles heart, have an overlapping distribution brainstem, while Vth motor nucleus is more rostrally located. Respiration-related efferent activity cardiac appeared to entrain ventilation. Peripheral stimulation with short...
The aim of the present study was to determine roles that externally versus internally oriented CO(2)/H(+)-sensitive chemoreceptors might play in promoting cardiorespiratory responses environmental hypercarbia air-breathing fish, Hoplerythrinus unitaeniatus (jeju). Fish were exposed graded (1, 2.5, 5, 10 and 20% CO(2)) also levels acidosis (pH approximately 7.0, 6.0, 5.8, 5.6, 5.3 4.7) equal pH hypercarbic water distinguish relative CO(2) H(+). We injected boluses CO(2)-equilibrated solutions...
This study examined the distribution and orientation of gill O(2) chemoreceptors in Oreochromis niloticus their role cardiorespiratory responses to graded hypoxia. Intact fish, a group with first arch excised (operated), were submitted hypoxia (oxygen uptake - V˙O(2) , breathing frequency fR, ventilatory stroke volume VT, ventilation V˙G, extraction from current EO(2) heart rate fH) compared. Their bolus injections NaCN into bloodstream (internal) or water stream (external) also determined....
ABSTRACT The metabolic increment that occurs after feeding demands cardiovascular adjustments to be maintained, as increased heart rate ( f H ) and cardiac output. In mammals, postprandial tachycardia seems triggered by an increase in adrenergic activity nonadrenergic noncholinergic (NANC) factors, while ectothermic vertebrates, this adjustment linked a withdrawal of vagal drive well NANC factors. Because the factors behind have not yet been investigated crocodilians, present study sought...
Abstract In terrestrial environments, upright spatial orientation can dramatically influence animals’ hemodynamics. Generally, large and elongated species are particularly sensitive to such due the greater extent of their vascular beds being verticalized, favoring establishment blood columns in bodies along with caudal pooling, thus jeopardizing circulation through a cascade effect reductions venous return, cardiac filling, stroke volume, output, arterial pressure. This hypotension triggers...
Abstract The most commonly used technique to study the barostatic regulation of blood pressure in ectothermic vertebrates consists determining heart rate response pharmacological manipulations pressure, so‐called “Oxford method.” Although well established, Oxford method has some important limitations, such as induction hypervolemia small animals and undesired effects vasoactive drugs on central peripheral baroreflex components. As an alternative, sequence method, which computerized...
Orthostatic hypotension is a phenomenon triggered by change in the position or posture of an animal, from horizontal to vertical head-up orientation, characterised blood pooling lower body and reduction central cranial arterial pressure (PA). This elicits systemic vasoconstriction tachycardia, which generally reduce increase PA. Little known about mediation importance such cardiovascular adjustments that counteracts haemodynamic effects orthostasis ectothermic vertebrates, some discrepancies...