The autonomic control of upright posture tachycardia in the arboreal lizard Iguana iguana

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dc.contributor.authorTroiano, Natalia Miriã [UNESP]
dc.contributor.authorArmelin, Vinicius Araújo [UNESP]
dc.contributor.authorBraga, Victor Hugo da Silva [UNESP]
dc.contributor.authorAbe, Augusto Shinya [UNESP]
dc.contributor.authorRantin, Francisco Tadeu
dc.contributor.authorFlorindo, Luiz Henrique [UNESP]
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionNational Institute of Science and Technology in Comparative Physiology (INCT–FAPESP/CNPq)
dc.contributor.institutionUniversidade Federal de São Carlos (UFSCar)
dc.date.accessioned2018-12-11T17:21:56Z
dc.date.available2018-12-11T17:21:56Z
dc.date.issued2018-03-01
dc.description.abstractIn terrestrial environments, upright spatial orientation can dramatically influence animals’ hemodynamics. Generally, large and elongated species are particularly sensitive to such influence due to the greater extent of their vascular beds being verticalized, favoring the establishment of blood columns in their bodies along with caudal blood pooling, and thus jeopardizing blood circulation through a cascade effect of reductions in venous return, cardiac filling, stroke volume, cardiac output, and arterial blood pressure. This hypotension triggers an orthostatic-(baroreflex)-tachycardia to normalize arterial pressure, and despite the extensive observation of this heart rate (fH) adjustment in experiments on orthostasis, little is known about its mediation and importance in ectothermic vertebrates. In addition, most of the knowledge on this subject comes from studies on snakes. Thus, our objective was to expand the knowledge on this issue by investigating it in an arboreal lizard (Iguana iguana). To do so, we analyzed fH, cardiac autonomic tones, and fH variability in horizontalized and tilted iguanas (0°, 30°. and 60°) before and after muscarinic blockade with atropine and double autonomic blockade with atropine and propranolol. The results revealed that I. Iguana exhibits significant orthostatic-tachycardia only at 60o inclinations—a condition that is primarily elicited by a withdrawal of vagal drive. Also, as in humans, increases in low-frequency fH oscillations and decreases in high-frequency fH oscillations were observed along with orthostatic-tachycardia, suggesting that the mediation of this fH adjustment may be evolutionarily conserved in vertebrates.en
dc.description.affiliationDepartment of Zoology and Botany São Paulo State University (UNESP)
dc.description.affiliationNational Institute of Science and Technology in Comparative Physiology (INCT–FAPESP/CNPq)
dc.description.affiliationDepartment of Zoology São Paulo State University (UNESP)
dc.description.affiliationAquaculture Center (CAUNESP) São Paulo State University (UNESP)
dc.description.affiliationDepartment of Physiological Sciences Federal University of São Carlos (UFSCar)
dc.description.affiliationUnespDepartment of Zoology and Botany São Paulo State University (UNESP)
dc.description.affiliationUnespDepartment of Zoology São Paulo State University (UNESP)
dc.description.affiliationUnespAquaculture Center (CAUNESP) São Paulo State University (UNESP)
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.format.extent130-139
dc.identifierhttp://dx.doi.org/10.1002/jez.2213
dc.identifier.citationJournal of Experimental Zoology Part A: Ecological and Integrative Physiology, v. 329, n. 3, p. 130-139, 2018.
dc.identifier.doi10.1002/jez.2213
dc.identifier.issn2471-5646
dc.identifier.issn2471-5638
dc.identifier.lattes2797832406818407
dc.identifier.scopus2-s2.0-85050694886
dc.identifier.urihttp://hdl.handle.net/11449/176649
dc.language.isoeng
dc.relation.ispartofJournal of Experimental Zoology Part A: Ecological and Integrative Physiology
dc.rights.accessRightsAcesso restrito
dc.sourceScopus
dc.subjectautonomic nervous system
dc.subjectgravity
dc.subjectheart rate
dc.subjectlizard
dc.subjectorthostasis
dc.subjectspectral analysis
dc.titleThe autonomic control of upright posture tachycardia in the arboreal lizard Iguana iguanaen
dc.typeArtigo
unesp.author.lattes2797832406818407
unesp.author.lattes8776757457144680[4]
unesp.author.orcid0000-0001-9430-8935[6]
unesp.author.orcid0000-0002-6765-8726[4]

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Jaboticabal - CAUNESP - Centro de Aquicultura da Unesp