Acurácia de critérios para vagotonia no eletrocardiograma de repouso de 12 derivações: uma análise com curvas ROC

Lazzoli, José Kawazoe; Castro, Claudia Lúcia Barros de; Nóbrega, Antônio Cláudio Lucas da; Araújo, Cláudio Gil Soares de

doi:10.1590/s1517-86922002000200004

Cited by 7 publications

(7 citation statements)

References 28 publications

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“…23,43 Based on this, the 4sET results have also been successfully used as criteria for evaluate ECG signs of vagotonia in healthy subjects 44 and elite athletes. 45 Interestingly, similar 4sET results have been obtained with upper or lower-limb cycling, 46 stationary running 47 or with active and passive exercises. 39 Apart from being shown to be reliable, 25 the 4sET protocol has been shown to be safe and simple to perform and to produce quantifiable results.…”

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confidence: 63%

Cardiac vagal index varies according to field position in male elite football players

Araújo¹,

Bottino²,

Pinto³

2018

Medical Express

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BACKGROUND: Cardiac vagal index (CVI) is supposedly higher in athletes and may differ between sports and/or between field positions. OBJECTIVE: To compare CVI: a) between elite football players vs. non-athletes and b) according to five football positions. METHOD: 242 football players of the first Brazilian/Angolan division were divided in five positions (N): goalkeepers (17), defenders (44), wingers (34), midfielders (87) and forwarders (60) and compared with 303 age-matched healthy non-athletes. CVI was estimated from a 4-second exercise test by quantifying the ratio of two cardiac cycle durations, before and at the end of a fast unloaded cycling exercise. RESULTS: Football players had resting and maximal heart rates of, respectively, 59 and 190 bpm and measured VO 2 max of 62.2 mL/(kg.min). Players and non-athletes showed similar CVI results (median-[P25-P75]) -1.63-[1.46-1.84] vs 1.61-[1.41-1.81] (p = 0.22). Wingers tended to have a higher CVI (1.84-[1.60-1.99]), especially when compared to defenders (1.53-[1.41-1.72] (p = 0.01). There was a modest non-physiologically relevant association between VO 2 max and CVI (r = 0.15). CONCLUSIONS: Football players did not differ from non-athletes in CVI; however, among players, wingers were more often vagotonic, which may represent a hemodynamic advantage for match situations, where rapid heart rate transitions and faster oxygen delivery to muscles are required.

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Section: ■ Discussionsupporting

confidence: 63%

Cardiac vagal index varies according to field position in male elite football players

Araújo¹,

Bottino²,

Pinto³

2018

Medical Express

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“…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). 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).…”

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confidence: 99%

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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“…The 4sET is a pharmacologically validated autonomic test, whose finality is the isolated analysis of the vagal modulation of heart rate in the initial transient of dynamic exercise 12 . Since it was reported, 4sET has been applied in the clinical area in some sports medicine and cardiology laboratories, in addition to being used as an instrument of scientific investigation in the research developed by our group 11,[13][14][15][16][17][18] and also by other research centers 19 .…”

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Validação do teste de exercício de 4 segundos em posição ortostática

Almeida¹,

Ricardo²,

Araújo³

2004

Arq. Bras. Cardiol.

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160Cardiovascular diseases are the major cause of mortality in Brazil, accounting for 32% of all recorded deaths and 10% of all hospital admissions in 2000 1 . The risk of several cardiovascular events increases many times due to autonomic dysfunction, frequently caused by a reduction in parasympathetic activity 2 , which is a strong and independent indicator of a negative prognosis 3 both in individuals with heart failure 4,5 and after infarction 6 , and even in the general population 7 .There are several valid procedures to investigate the autonomic condition of an individual, providing relevant clinical or physiological contributions, or both [8][9][10] , among which the 4-second exercise test (4sET), originally proposed by Araújo et al 11 , stands out. The 4sET is based on eliminating the vagal cardiac tonus in the first seconds of rapid exercise involving large muscle groups. The 4sET is a pharmacologically validated autonomic test, whose finality is the isolated analysis of the vagal modulation of heart rate in the initial transient of dynamic exercise 12 . Since it was reported, 4sET has been applied in the clinical area in some sports medicine and cardiology laboratories, in addition to being used as an instrument of scientific investigation in the research developed by our group 11,13-18 and also by other research centers 19 .Despite the simplicity and low cost of the 4sET, and the easy interpretation of its results, the need for a cycloergometer remains a limitation for the broader use of the test according to the original protocol. Considering that a cycloergometer is not frequently found in specialized laboratories and clinics for exercise testing, it is necessary to analyze the possibility of performing 4sET under more appropriate conditions. This study aimed to test the operational viability of the 4sET performed in the orthostatic position without an ergometer and to validate a 4sET protocol. MethodsThe study comprised 47 adults of both sexes (40±17 years, 169±9 cm, 72±14 kg) with different clinical conditions, who randomly underwent 3 consecutive repetitions of 4sET in the 2 protocols suggested as follows: 1) the CYCLO protocol using a cycloergometer, according to the original 4sET 12 ; and 2) the alternative ORTHO protocol, with 4sET performed in the orthostatic position. The first repetition in each protocol served to acquaint the individuals with the procedures, and the best result of the last 2 repetitions was considered to represent the vagal cardiac index of the individual. All participants signed the written consent before the tests. The protocol and the study design were approved by the institution. 0.84, 0.85, and 0.93, respectively (P<0.001). Original Article Validation of the 4-Second Exercise Test in the Orthostatic Position ConclusionThe 4sET performed in the orthostatic position proved to be a valid option for assessing the vagal cardiac tonus in laboratories lacking a cycloergometer, without jeopardizing clinical interpretation. In addition to simplicity and applicability, the pr...

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Acurácia de critérios para vagotonia no eletrocardiograma de repouso de 12 derivações: uma análise com curvas ROC

Cited by 7 publications

References 28 publications

Cardiac vagal index varies according to field position in male elite football players

Cardiac vagal index varies according to field position in male elite football players

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

Validação do teste de exercício de 4 segundos em posição ortostática

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