Repolarização precoce no eletrocardiograma do atleta: bases iônicas e modelo vetorial

Barbosa, Eduardo Corrêa; Benchimol-Barbosa, Paulo Roberto; Bomfim, Alfredo de Souza; Rocha, Plínio José da; Ginefra, P

doi:10.1590/s0066-782x2004000100011

Cited by 3 publications

(4 citation statements)

References 26 publications

(25 reference statements)

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“…Further, Dixon and collaborators reported greater variability in the heart frequency under controlled ventilation in trained than in untrained individuals, translating as an increase in the vagal activity in rest in athletes (Dixon et al 1992). Further on this aspect, the remodeling of the anatomic modulation of the heart, secondary to training, includes the reduction of sympathetic activity and increase in parasympathetic activity (Barbosa et al 2004). It is further suggested that the number of cells that really polarized in the epicardial-endocardial direction, due to the even earlier start of epicardium repolarization, could create T waves with great amplitude (Barbosa et al 2004, Dixon et al 1992.…”

Section: Discussionmentioning

confidence: 99%

“…In both the male and female agouti, the T-wave had high amplitude values, when compared to the R wave. In humans the presence of great amplitude T-wave is observed in sinusal bradycardia (frequently in athletes), and in vagotonic individuals (Kambara & Phillips 1976, Alimurung et al 1980, Barbosa et al 2004. In humans, the overlapping of the S-T segments and high T-wave amplitudes can occur in 2.5% to 14% of adult individuals, without evidence of cardiovascular or extracardiac diseases (Lazzoli et al 2002).…”

Section: Discussionmentioning

confidence: 99%

“…Further on this aspect, the remodeling of the anatomic modulation of the heart, secondary to training, includes the reduction of sympathetic activity and increase in parasympathetic activity (Barbosa et al 2004). It is further suggested that the number of cells that really polarized in the epicardial-endocardial direction, due to the even earlier start of epicardium repolarization, could create T waves with great amplitude (Barbosa et al 2004, Dixon et al 1992. Regarding animals, it was observed in racehorses that the T-waves presented great amplitude, corresponding to 43% of the R wave (Diniz et al 2011).…”

Section: Discussionmentioning

confidence: 99%

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Electrocardiogram assessment in non-anaesthetized clinically healthy agouti (Dasyprocta primnolopha, Wagler 1831)

et al. 2013

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Pesq. Vet. Bras. 33(Supl.1):8-14, dezembro 2013 8 RESUMO.-[Avaliação do eletrocardiograma em cutias (Dasyprocta primnolopha, Wagler 1831) não-anestesiadas clinicamente saudáveis.] A cutia é uma das espé-cies mais intensamente caçados em toda a Amazônia e as regiões semi-áridas do nordeste do Brasil. Considerando--se a tendência atual no manejo de animais silvestres em cativeiro, o objetivo deste estudo foi determinar os valores de referência para o coração cutia criadas em cativeiro, com base em avaliações do eletrocardiograma (ECG). Foram selecionadas cutias adultas e sem sinais clínicos de doença cardíaca (n=30). Os animais foram contidos fisicamente e, em seguida, o ECG foi realizado. Medições padronizadas foram tomadas para estabelecer a análise estatística dos dados. Análise do complexo QRS apresentou valores compatíveis com os relatórios pregressos em animais animais de companhia, assim como para os poucos dados disponí-veis para outras espécies selvagens e exóticas, com exceção da onda T, que mostrou amplitude semelhante à onda R em The agouti is one of the most intensely hunted species throughout the Amazon and the semiarid regions of north-eastern Brazil. Considering the current tendency of wild animal management in captivity, the objective of this study was to determine heart reference values for agouti raised in captivity, based on electrocardiographic assessments (ECG). Adult agouti were selected without clinical signs of heart disease (n=30). The animals were restrained physically and then the ECG was performed. Standardized measurements were taken to establish the statistical analysis of the data. Analysis of the QRS complex showed values compatible with previous reports in peer animals and the limited data available for other wild and exotic species, except for the T wave that showed similar amplitude to the R wave in all the animals studied. The data obtained provided the first reference values for ECG tracings in agouti, contributing to a better understanding of heart electrophysiology in identifying myocardial pathology in these animals. Electrocardiogram assessment in non-anaesthetized clinically healthy agouti (Dasyprocta primnolopha, Wagler 1831) todos os animais estudados. Os dados obtidos permitiram a aquisição dos primeiros valores de referência para os traçados de ECG em cutias, contribuindo para uma melhor compreensão eletrofisiologia cardíaca, na identificação de miocardiopatia nesses animais.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Electrocardiogram assessment in non-anaesthetized clinically healthy agouti (Dasyprocta primnolopha, Wagler 1831)

et al. 2013

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“…Esse mecanismo está relacionado com o Inotropismo e Cronotropismo, onde representam a força de contração do miocárdio e a frequência cardíaca respectivamente. O inotropismo aumenta a contratilidade do coração possibilitando uma maior eficácia do miocárdio e no volume de ejeção 19 . O Sistema Nervoso Autônomo influencia diretamente no nódulo sinusal (NSA), denominado células do marcapasso.…”

Section: Idadeunclassified

Comportamento da frequência cardíaca, pressão arterial e duplo produto em atletas de Judô

Machado

Carvalho

2022

Rev Bras Educ Fís Esporte

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O presente estudo tem a importância de verificar as alterações cardíacas durante o treinamento, servindo de indicador para o atleta melhorar sua performance, evitando esforço excessivo do miocárdio. O estudo possui natureza descritiva de abordagem quantitativa, cujos dados de DP foram obtidos por meio da multiplicação da Frequência Cardíaca e Pressão Arterial Sistólica e tabulada no programa Excel. Um grupo de vinte atletas, maiores de idade, participou da pesquisa. Durante a atividade, ocorreu um aumento de 42,6 bpm e os valores do DP nos atletas antes, durante e depois do treino foram de 10706,3, 16948,5 e 14089,6, respectivamente, mostrando que os indivíduos possuem um bom condicionamento. A partir dos resultados encontrados foi percebido que ocorreu alteração dos parâmetros hemodinâmicos nos diferentes momentos dos atletas e que podem influenciar no condicionamento físico e na prescrição de treino.

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The effect of an aerobic training program on the electrical remodeling of the heart: high-frequency components of the signal-averaged electrocardiogram are predictors of the maximal aerobic power

Marocolo¹,

Nadal²,

Benchimol-Barbosa³

2007

Braz J Med Biol Res

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Increased heart rate variability (HRV) and high-frequency content of the terminal region of the ventricular activation of signal-averaged ECG (SAECG) have been reported in athletes. The present study investigates HRV and SAECG parameters as predictors of maximal aerobic power (VO 2 max) in athletes. HRV, SAECG and VO 2 max were determined in 18 high-performance long-distance (25 ± 6 years; 17 males) runners 24 h after a training session. Clinical visits, ECG and VO 2 max determination were scheduled for all athletes during thew training period. A group of 18 untrained healthy volunteers matched for age, gender, and body surface area was included as controls. SAECG was acquired in the resting supine position for 15 min and processed to extract average RR interval (Mean-RR) and root mean squared standard deviation (RMSSD) of the difference of two consecutive normal RR intervals. SAECG variables analyzed in the vector magnitude with 40-250 Hz band-pass bi-directional filtering were: total and 40-µV terminal (LAS40) duration of ventricular activation, RMS voltage of total (RMST) and of the 40-ms terminal region of ventricular activation. Linear and multivariate stepwise logistic regressions oriented by inter-group comparisons were adjusted in significant variables in order to predict VO 2 max, with a P < 0.05 considered to be significant. VO 2 max correlated significantly (P < 0.05) with RMST (r = 0.77), Mean-RR (r = 0.62), RMSSD (r = 0.47), and LAS40 (r = -0.39). RMST was the independent predictor of VO 2 max. In athletes, HRV and high-frequency components of the SAECG correlate with VO 2 max and the high-frequency content of SAECG is an independent predictor of VO 2 max.

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Repolarização precoce no eletrocardiograma do atleta: bases iônicas e modelo vetorial

Cited by 3 publications

References 26 publications

Electrocardiogram assessment in non-anaesthetized clinically healthy agouti (Dasyprocta primnolopha, Wagler 1831)

Electrocardiogram assessment in non-anaesthetized clinically healthy agouti (Dasyprocta primnolopha, Wagler 1831)

Comportamento da frequência cardíaca, pressão arterial e duplo produto em atletas de Judô

The effect of an aerobic training program on the electrical remodeling of the heart: high-frequency components of the signal-averaged electrocardiogram are predictors of the maximal aerobic power

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