Regulation of breathing and body temperature of a burrowing rodent during hypoxic-hypercapnia

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dc.contributor.authorBarros, RCH
dc.contributor.authorAbe, Augusto Shinya [UNESP]
dc.contributor.authorCarnio, E. C.
dc.contributor.authorBranco, LGS
dc.contributor.institutionUniversidade de São Paulo (USP)
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2014-02-26T17:19:31Z
dc.date.accessioned2014-05-20T13:58:58Z
dc.date.available2014-02-26T17:19:31Z
dc.date.available2014-05-20T13:58:58Z
dc.date.issued2004-05-01
dc.description.abstractBurrowing mammals usually have low respiratory sensitivity to hypoxia and hypercapnia. However, the interaction between ventilation (V), metabolism and body temperature (Tb) during hypoxic-hypercapnia has never been addressed. We tested the hypothesis that Clyomys bishopi, a burrowing rodent of the Brazilian cerrado, shows a small ventilatory response to hypoxic-hypercapnia, accompanied by a marked drop in Tb and metabolism. V, Tb and O-2 consumption (VO2) of C. bishopi were measured during exposure to air, hypoxia (10% and 7% O-2), hypercapnia (3% and 5% CO2) and hypoxic-hypercapnia (10% O-2 + 3% CO2). Hypoxia of 7% but not 10%, caused a significant increase in V, and a significant drop in Tb. Both hypoxic levels decreased VO2 and 7% O-2 significantly increased V/VO2. Hypercapnia of 5%, but not 3%, elicited a significant increase in V, although no significant change in Tb, VO2 or V/VO2 was detected. A combination of 10% O-2 and 3% CO2 had minor effects on V and Tb, while VO2 decreased and V/VO2 tended to increase. We conclude that C. bishopi has a low sensitivity not only to hypoxia and hypercapnia, but also to hypoxic-hypercapnia, manifested by a biphasic ventilatory response, a drop in metabolism and a tendency to increase V/VO2. The effect of hypoxic-hypercapnia was the summation of the hypoxia and hypercapnia effects, with respiratory responses tending to have hypercapnic patterns while metabolic responses, hypoxic patterns. (C) 2004 Elsevier B.V. All rights reserved.en
dc.description.affiliationUniv São Paulo, Escola Enfermagem Ribeirao Preto, Dept Enfermagem Geral & Expecializada, BR-14040902 Ribeirao Preto, SP, Brazil
dc.description.affiliationUniv Estadual Paulista, Dept Zool, BR-13506900 Rio Claro, SP, Brazil
dc.description.affiliationUniv São Paulo, Fac Odontol, Dept Morfol Estomatol & Fisiol, BR-14040902 Ribeirao Preto, SP, Brazil
dc.description.affiliationUnespUniv Estadual Paulista, Dept Zool, BR-13506900 Rio Claro, SP, Brazil
dc.format.extent97-104
dc.identifierhttp://dx.doi.org/10.1016/j.cbpb.2004.03.011
dc.identifier.citationComparative Biochemistry and Physiology A-molecular & Integrative Physiology. New York: Elsevier B.V., v. 138, n. 1, p. 97-104, 2004.
dc.identifier.doi10.1016/j.cbpb.2004.03.011
dc.identifier.issn1095-6433
dc.identifier.lattes8776757457144680
dc.identifier.urihttp://hdl.handle.net/11449/20935
dc.identifier.wosWOS:000222294400013
dc.language.isoeng
dc.publisherElsevier B.V.
dc.relation.ispartofComparative Biochemistry and Physiology A-molecular & Integrative Physiology
dc.relation.ispartofjcr2.258
dc.relation.ispartofsjr0,836
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.subjecthypoxiapt
dc.subjecthypercapniapt
dc.subjecthypoxic-hypercapniapt
dc.subjectfossorial rodentpt
dc.subjectmetabolismpt
dc.subjectthermoregulationpt
dc.subjectventilationpt
dc.subjectmammalspt
dc.titleRegulation of breathing and body temperature of a burrowing rodent during hypoxic-hypercapniaen
dc.typeArtigo
dcterms.licensehttp://www.elsevier.com/about/open-access/open-access-policies/article-posting-policy
dcterms.rightsHolderElsevier B.V.
unesp.author.lattes8776757457144680[2]
unesp.author.orcid0000-0002-6765-8726[2]
unesp.campusUniversidade Estadual Paulista (Unesp), Instituto de Biociências, Rio Claropt

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Artigos - Zoologia - IBRC