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dc.contributor.authorAlmeida, Ronaldo André Castelo dos Santos de-
dc.date.accessioned2025-03-07T14:30:38Z-
dc.date.available2025-03-07T14:30:38Z-
dc.date.issued2023-04-14-
dc.identifier.citationALMEIDA, Ronaldo André Castelo dos Santos de. Influência do protocolo de adaptação ao calor sobre a função cardíaca e modulação autonômica: aclimatação ativa versus passiva, contínua versus intermitente. 2023. 55 f. Dissertação (Mestrado em Ciências Fisiológicas) - Instituto de Ciências Biológicas e da Saúde, Universidade Federal Rural do Rio de Janeiro, Seropédica, 2023.pt_BR
dc.identifier.urihttps://rima.ufrrj.br/jspui/handle/20.500.14407/20255-
dc.description.abstractIntrodução: O treinamento aeróbio em ambientes quentes é responsável por uma demanda metabólica que impacta no funcionamento cardíaco, especialmente em atletas. Objetivo: Avaliação o impacto do treinamento aeróbio e exposição a ambientes com altas temperaturas sobre a função cardíaca de ratos wistar. Metodologia: O protocolo experimental deste estudo foi aprovado sob registro CEUA/ICBS no 22/2022. A amostra foi composta por 24 ratos wistar, machos e adultos (60 dias), divididos aleatoriamente para compor os grupos: Controle de curta exposição (CTRLC), controle de longa exposição (CTRLL), curta exposição exclusiva ao calor (CALC), longa exposição exclusiva ao calor (CALL), curta exposição ao calor e treinamento aeróbio (CATRC) e longa exposição ao calor e treinamento aeróbio (CATRL). A função cardíaca foi analisada através do método de coração isolado de Langendorff. A atividade elétrica foi avaliada através do eletrocardiograma (ECG) e, a partir deste, foi analisada a variabilidade da frequência cardíaca (VFC). O protocolo de treinamento consistiu na realização de treinamento aeróbio em esteira rolante com câmara de aquecimento integrada, desenvolvida neste laboratório. A avaliação da temperatura corporal foi aferida por termômetro retal e as medidas tomadas imediatamente após o teste de esteira. A exposição ao calor ocorreu por meio da permanência na câmara de aquecimento com temperatura de 32֯C (+ 0,5). Resultados: Observou-se que a exposição passiva por 4 semanas promoveu redução na frequência cardíaca (FC) em CALL (Pré vs. Pós; p<0,05) e CATRL (Pré vs. Pós; p<0,05). A PDVE d o grupo CALL apresentou valores significativamente maiores comparado a CTRLL e CATRL (p<0,05). Já CATRL apresentou valores mais baixos na PDVE quando comparado a CTRLL e CALL (p<0,05). Ao avaliar a temperatura colônica (Tcol) e o tempo de permanência na esteira rolante, todos os grupos apresentaram valores maiores comparados ao momento prévio à aplicação dos protocolos (Pré vs. Pós; p<0,05). No ECG o intervalo RR foi maior em ambos os grupos quando comparados ao CTRLL (Pré vs. Pós; p<0,05), assim como o componente de muito baixa frequência (VLF) da análise de VFC (Pré vs. Pós; p<0,05). Discussão A hipótese de que a exposição passiva sem associação com o treinamento aeróbio pode contribuir para aclimatação foi demonstrada com a redução da FC ao final do período experimental, apesar de ainda demonstrar maior PDVE, o que sugere algum grau de estresse pelo calor após 4 semanas. A análise da VFC demonstrou maior ação parassimpática, através do aumento de RR, e consequente menor simpática sobre o coração, além de aumento no VLF que está associado a retirada de ação simpática e ajustes termorregulatórios. A PDVE menor em CATRL sugere que a associação do calor com o exercício traz benefícios ao desempenho que podem estar relacionados com alterações na cinética dos canais iônicos responsáveis pela fase 4 do potencial de ação nas células P do nodo sinoatrial. Conclusão: Baseado nos resultados desse estudo, compreende-se que a exposição passiva ao calor associada ao treinamento aeróbio confere adaptações, propõe segurança e vantagens fisiológicas para o desempenho atlético.pt_BR
dc.description.sponsorshipConselho Nacional de Pesquisa e Desenvolvimento Científico e Tecnológico - CNPqpt_BR
dc.description.sponsorshipCoordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPESpt_BR
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado do Rio de Janeiro - FAPERJpt_BR
dc.languageporpt_BR
dc.publisherUniversidade Federal Rural do Rio de Janeiropt_BR
dc.subjectEstresse térmicopt_BR
dc.subjecttermorregulaçãopt_BR
dc.subjectfunção cardíacapt_BR
dc.subjecttreinamento aeróbiopt_BR
dc.subjectThermal stresspt_BR
dc.subjectthermoregulationpt_BR
dc.subjectcardiac functionpt_BR
dc.subjectaerobic trainingpt_BR
dc.titleInfluência do protocolo de adaptação ao calor sobre a função cardíaca e modulação autonômica: aclimatação ativa versus passiva, contínua versus intermitentept_BR
dc.title.alternativeInfluence of heat adaptation protocol on cardiac function and autonomic modulation: active versus passive, continuous versus intermittent acclimatizationen
dc.typeDissertaçãopt_BR
dc.description.abstractOtherIntroduction: Aerobic training in hot environments is responsible for a metabolic demand that impacts cardiac functioning, especially in athletes. Objective: To evaluate the impact of aerobic training and exposure to high temperature environments on the cardiac function of Wistar rats. Methodology: The experimental protocol of this study was approved under registration CEUA/ICBS no 22/2022. The sample consisted of 24 Wistar rats, male and adult (60 days), randomly divided to compose the groups: Short exposure control (CTRLC), long exposure control (CTRLL), short exclusive exposure to heat (CALC), long exclusive heat exposure (CALL), short heat exposure and aerobic training (CATRC), and long heat exposure and aerobic training (CATRL). Cardiac function was analyzed using the Langendorff isolated heart method. The electrical activity was evaluated through the electrocardiogram (ECG) and, from this, the heart rate variability (HRV) was analyzed. The training protocol consisted of performing aerobic training on a treadmill with an integrated heating chamber, developed in this laboratory. Body temperature was measured using a rectal thermometer and measurements were taken immediately after the treadmill test. Exposure to heat occurred by staying in the heating chamber at a temperature of 32°C (+ 0.5). Results: It was observed that passive exposure for 4 weeks promoted a reduction in heart rate (HR) in CALL (Pre vs. Post; p<0.05) and CATRL (Pre vs. Post; p<0.05). The LVDP of the CALL group showed significantly higher values compared to CTRLL and CATRL (p<0.05). CATRL, on the other hand, presented lower values in PDVE when compared to CTRLL and CALL (p<0.05). When evaluating the colonic temperature (Tcol) and the time spent on the treadmill, all groups showed higher values compared to the moment prior to the application of the protocols (Pre vs. Post; p<0.05). On the ECG, the RR interval was greater in both groups when compared to the CTRLL (Pre vs. Post; p<0.05), as well as the very low frequency component (VLF) of the HRV analysis (Pre vs. Post; p <0.05). Discussion The hypothesis that passive exposure without association with aerobic training can contribute to acclimatization was demonstrated with the reduction in HR at the end of the experimental period, despite still demonstrating higher LVDP, which suggests some degree of heat stress after 4 weeks . The analysis of the HRV showed greater parasympathetic action, through the increase in RR, and consequent lower sympathetic action on the heart, in addition to an increase in the VLF that is associated with withdrawal of sympathetic action and thermoregulatory adjustments. The lower LVDP in CATRL suggests that the association of heat with exercise brings benefits to performance that may be related to changes in the kinetics of the ion channels responsible for phase 4 of the action potential in the P cells of the sinoatrial node. Conclusion: Based on the results of this study, it is understood that passive exposure to heat associated with aerobic training confers adaptations, proposes safety and physiological advantages for athletic performance.pt_BR
dc.contributor.advisor1Silveira, Anderson Luiz Bezerra da-
dc.contributor.advisor1IDhttps://orcid.org/0000-0002-0862-5094pt_BR
dc.contributor.advisor1Latteshttp://lattes.cnpq.br/2389812933788850pt_BR
dc.contributor.referee1Silveira, Anderson Luiz Bezerra da-
dc.contributor.referee1IDhttps://orcid.org/0000-0002-0862-5094pt_BR
dc.contributor.referee1Latteshttp://lattes.cnpq.br/2389812933788850pt_BR
dc.contributor.referee2Gomes, Diego Viana-
dc.contributor.referee2IDhttps://orcid.org/0000-0002-5391-1882pt_BR
dc.contributor.referee2Latteshttp://lattes.cnpq.br/6685436931430741pt_BR
dc.contributor.referee3Olivares, Emerson Lopes-
dc.contributor.referee3Latteshttp://lattes.cnpq.br/1361659701207857pt_BR
dc.creator.IDhttps://orcid.org/0009-0004-1994-9715pt_BR
dc.creator.Latteshttp://lattes.cnpq.br/3487007086052462pt_BR
dc.publisher.countryBrasilpt_BR
dc.publisher.departmentInstituto de Ciências Biológicas e Da Saúdept_BR
dc.publisher.initialsUFRRJpt_BR
dc.publisher.programPrograma de Pós-Graduação em Ciências Fisiológicaspt_BR
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dc.subject.cnpqFisiologiapt_BR
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