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Id: biblio-985130
Autor: Schaan, Camila Wohlgemuth; Feltez, Gabriela; Schaan, Beatriz D'Agord; Pellanda, Lucia Campos.
Título: Functional capacity in children and adolescents with congenital heart disease / Capacidade funcional em crianças e adolescentes com cardiopatia congênita
Fonte: Rev. Paul. Pediatr. (Ed. Port., Online);37(1):65-72, Jan.-Mar. 2019. tab, graf.
Idioma: en.
Resumo: ABSTRACT Objective: To evaluate the physical activity level and functional capacity of children and adolescents with congenital heart disease and to describe correlations between functionality, surgical and echocardiographic findings, metabolic and inflammatory profile and differences between acyanotic and cyanotic heart defects. Methods: A cross-sectional study including children and adolescents with congenital heart disease between six and 18 years old that were evaluated with the 6-minute walk test (6MWT) to assess functional capacity. The short version form of the International Physical Activity Questionnaire (IPAQ) was performed to evaluate physical activity levels. Also, echocardiography and blood collection, to evaluate the metabolic (blood glucose, lipids, insulin) and inflammatory markers (C-reactive protein), were assessed. Results: Twenty-five individuals were evaluated. Of them, 14 had acyanotic heart defects and 11 cyanotic heart defects. Mean age was 12.0±3.7 years, and 20 (80%) were male. IPAQ showed that six (24%) individuals were very active, eight (32%) were active, nine (36%) had irregular physical activity, and two (8%) were sedentary. The mean distance walked in the 6MWT, considering all studied individuals, was 464.7±100.4 m, which was 181.4±42.0 m less than the predicted (p=0.005). There was a positive correlation between Z score 6MWT and the number of surgical procedures (r=-0.455; p=0.022). Conclusions: Children and adolescents with congenital heart disease have low functional capacity, but they are not completely sedentary.

RESUMO Objetivo: Avaliar o nível de atividade física e a capacidade funcional de crianças e adolescentes com cardiopatia congênita, além de descrever correlações entre funcionalidade, achados cirúrgicos e ecocardiográficos, perfil metabólico e inflamatório e diferenças entre cardiopatias congênitas acianótica e cianótica. Métodos: Estudo transversal com crianças e adolescentes com cardiopatia congênita entre seis e 18 anos de idade. Foi realizado o teste de caminhada de 6 minutos para avaliar a capacidade funcional, e aplicou-se a versão curta do Questionário Internacional de Atividade Física (IPAQ) para avaliar os níveis de atividade física. Foram feitos também: exame ecocardiográfico, coleta de sangue para avaliação de perfil metabólico e inflamatório (glicemia, triglicerídeos, colesterol total, lipoproteína de alta densidade - HDL-colesterol, lipoproteína de baixa densidade - LDL-colesterol, hemograma completo, proteína C reativa, insulina). Resultados: Foram avaliados 25 indivíduos, dos quais 14 tinham cardiopatia congênita acianótica e 11 cianótica. A média de idade foi de 12,0±3,7 anos, e 20 (80%) eram do sexo masculino. O IPAQ mostrou que seis (24%) indivíduos eram muito ativos, oito (32%) eram ativos, nove (36%) tinham atividade física irregular e dois (8%) eram sedentários. A média de distância percorrida no teste de caminhada dos 6 minutos, considerando todos os indivíduos estudados, foi de 464,7±100,4 m, sendo 181,4±42,0 m menor do que o previsto (p=0,005). Encontrou-se correlação entre o escore Z do teste de caminhada de 6 minutos e o número de procedimentos cirúrgicos realizados (r=-0,455; p=0,022). Conclusões: Crianças e adolescentes com cardiopatia congênita têm baixa capacidade funcional, mas não são completamente sedentários.
Descritores: Exercício
Tolerância ao Exercício
Estilo de Vida Sedentário
AMERICAN DENTAL ASSOCIATIONACCESSORY NERVE
-Determinação da Pressão Arterial/métodos
Determinação da Pressão Arterial/estatística & dados numéricos
Brasil/epidemiologia
Índice de Massa Corporal
Estudos Transversais
Teste de Caminhada/métodos
Teste de Caminhada/estatística & dados numéricos
Cardiopatias Congênitas/diagnóstico
Cardiopatias Congênitas/fisiopatologia
Cardiopatias Congênitas/psicologia
Cardiopatias Congênitas/epidemiologia
Frequência Cardíaca
Limites: Seres Humanos
Masculino
Feminino
Criança
Adolescente
Responsável: BR1.1 - BIREME


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Id: biblio-1051644
Autor: Rodríguez-De Ávila, Ubaldo; Campos Braga, Isaac; Paba Barbosa, Carmelina; Leocadio-Miguel, Mario André; Fontanelle-Araujo, John.
Título: La Variabilidad de la Frecuencia Cardíaca (VFC) como medida Objetiva de la Atención Sostenida en el Salón de Clase / The Variability of Heart Rate (HRV) as an Objective Measurement of Sustained Attention in the Classroom
Fonte: Duazary;16(2,n.esp):395-402, 2019. tab, ilus.
Idioma: es.
Resumo: El objetivo que se propone en el presente informe es probar la hipótesis teórica de que el tiempo de atención sostenida en los estudiantes en el salón de clase puede ser medida por la respuesta autonómica de la VFC. 10 sujetos participaron del experimento. La VFC fue observada por medio del análisis de series temporales en segmentos de cinco (5) minutos hasta completar la ventana de observación para medias móviles simples de 60 minutos. Se analizaron las series RR en los dominios de tiempo, de frecuencia e índices no lineares.

The objective proposed in this report is to test the theoretical hypothesis that the time of attention sustained by students in the classroom can be measured by the autonomic response of the VFC. 10 subjects participated in the experiment. HRV was observed by means of the analysis of time series in segments of five (5) minutes until completing the observation window for simple moving averages of 60 minutes. The RR series were analyzed in the time, frequency and non-linear index domains.
Descritores: Frequência Cardíaca
Tipo de Publ: Artigo Clássico
Responsável: CO644.1 - Biblioteca Germán Bula Meyer


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Id: biblio-1008711
Autor: Sequeira, Orlando Robert; Torales, Judith María; García, Laura Beatriz; Centurión, Osmar Antonio.
Título: Evaluación diagnóstica y manejo terapéutico farmacológico en pacientes con fibrilación auricular / Diagnostic evaluation and pharmacological therapeutic management in patients with atrial fibrillation
Fonte: Mem. Inst. Invest. Cienc. Salud (Impr.);17(2):86-101, ago. 2019. ilus, tab.
Idioma: es.
Resumo: La fibrilación auricular (FA) es la arritmia sostenida más frecuente que puede presentarse en una amplia variedad de condiciones clínicas. A pesar de los progresos en el tratamiento de los pacientes con FA, esta arritmia sigue siendo una de las más importantes causas de accidente cerebrovascular, insuficiencia cardiaca, muerte súbita y morbilidad cardiovascular en todo el mundo. El objetivo del tratamiento con fármacos antiarrítmicos es mejorar los síntomas relacionados con la FA, y buscar un equilibrio entre la carga sintomática, la posibilidad de reacciones farmacológicas adversas y las preferencias del paciente. El control de la frecuencia cardiaca a corto y largo plazo se puede lograr con bloqueadores beta, digoxina, bloqueadores de los canales del calcio o tratamiento combinado. Si bien otros fármacos antiarrítmicos de clase III también tienen un efecto limitador de la frecuencia, solo deben emplearse para el control del ritmo cardiaco. Restaurar y mantener el ritmo sinusal también es una parte integral del tratamiento de la FA. Los fármacos antiarrítmicos de clase III duplican la tasa de pacientes en ritmo sinusal. El tratamiento para el control del ritmo está indicado para mejorar los síntomas de los pacientes con FA que siguen sintomáticos a pesar del tratamiento adecuado para el control de la frecuencia cardiaca. La combinación de antiarrítmicos que prolongan el intervalo QT no se debe emplear para el control del ritmo cardiaco en la FA(AU)

Atrial fibrillation (AF) is the most frequent sustained arrhythmia that can occur in a wide variety of clinical conditions. Despite progress in the treatment of patients with AF, this arrhythmia remains one of the most important causes of stroke, heart failure, sudden death and cardiovascular morbidity worldwide. The aim of treatment with antiarrhythmic drugs is to improve the symptoms related to AF, and to look for a balance between the symptomatic load, the possibility of adverse pharmacological reactions and the patient preferences. The short and long term heart rate control can be achieved with beta blockers, digoxin, calcium channel blockers or combination therapy. Although other class III antiarrhythmic drugs also have a frequency-limiting effect, they should only be used for the control of heart rhythm. Restoring and maintaining sinus rhythm is also an integral part of the treatment of AF. Class III antiarrhythmic drugs double the rate of patients who maintain their sinus rhythm. Treatment for rhythm control is indicated to improve the symptoms of patients with AF who remain symptomatic despite adequate treatment for heart rate control. The combination of antiarrhythmics that prolong the QT interval should not be used to control heart rhythm in AF(AU)
Descritores: Fibrilação Atrial/tratamento farmacológico
Antiarrítmicos/uso terapêutico
-Fibrilação Atrial/diagnóstico
Frequência Cardíaca/efeitos dos fármacos
Limites: Seres Humanos
Tipo de Publ: Revisão
Responsável: PY3.1 - Biblioteca


  4 / 2073 LILACS  
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Id: biblio-1051025
Autor: Rodriguez, Javier; Páez, Jaime; Cortes, Jairo; Montenegro, Carlos; Castro, Mario; Simanca, Fredys; Correa, Catalina; Prieto Bohórquez, Signed Esperanza.
Título: Evaluación del comportamiento cardíaco mediante una metodología diagnóstica basada en sistemas dinámicos en 16 horas / Evaluation of the cardiac behaviour with a diagnostic methodology sustained in dynamical systems in 16 hours
Fonte: Prensa méd. argent;104(7):352-360, sep2018. tab, graf.
Idioma: es.
Resumo: Antecedentes: Con conceptos provenientes de la teoría de sistemas dinámicos y la geometría fractal, se ha logrado caracterizar el comportamiento de la dinámica cardíaca, dando resultados objetivos y estableciendo distinciones entre estados de normalidad y enfermedad. Objetivo: Aplicar una ley matemática exponencial de la dinámica cardíaca, inscrita en el contexto de los sistemas dinámicos y la geometría fractal, para evidenciar su utilidad diagnóstica en 16 horas. Materiales y métodos: Fueron empleados 200 Holters y registros electrocardiográficos continuos, entre normales y con diferentes alteraciones cardíacas. Se simuló una secuencia de frecuencias cardíacas en 16 y 21 horas, con la cual se construyó el atractor de cada dinámica. También se calculó la dimensión fractal y la ocupación de los atractores en el espacio fractal. Se estableció el diagnóstico físico-matemático en 16 y 21 horas y la subsecuente validación estadística. Resultados: Fueron obtenidos valores en la rejilla Kp entre 44 y 198 para estados patológicos y entre 221 y 377 para estados de normalidad en 16 horas, la sensibilidad y especificidad fue del 100% y el coeficiente Kappa de 1. Conclusión: Se logró diferenciar de manera adecuada estados normales de patológicos mediante la ley exponencial aplicada en registros de 16 horas

Background: With concepts derived from dynamical systems theory and fractal geometry, it has been possible to characterize the behavior of the cardiac dynamics, giving objective results and estabishing distinctions between states of normality and disease. Objective: To apply an exponential mathematical law of cardiac dynamics, inscribed in the context of dynamical systems and fractal geometry, to demonstrate its diagnostic utility in the context of a reduction in the evaluation time, originally of 21 hours. Materials and methods: There were used 200 Holters and cotinuous electrocardiographic records, between normal and with different cardiac alterations. A sequence of heart rates was simulated in 16 and 21 hours, with which the attractor of each dynamic was constructed. There were also calculated the fractal dimension and the occupation of the attractors in the fractal space. The physical-mathematical diagnosis was establishd at 16 and 21 hours, and the staqtistical validation was performed. Results: Values obtained in the Kp grid were between 44 y 198 for pathological sttes, and between 221 and 377 for normal states in 16 hours. The sensitivity and specificity was 100% and the Kappa coefficient was 1. Conclusion: It was possible to differentiate adequately normal states of pathological by means fo the exponential law applied in registers of 16 hours
Descritores: Análise Estatística
Eletrocardiografia Ambulatorial/estatística & dados numéricos
Dinâmica não Linear
Fractais
Determinação da Frequência Cardíaca/métodos
Frequência Cardíaca
-Padrões de Referência
Limites: Seres Humanos
Adulto
Meia-Idade
Idoso
Idoso de 80 Anos ou mais
Responsável: AR392.1 - Biblioteca


  5 / 2073 LILACS  
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Id: biblio-1050740
Autor: Porras-Alvarez, Javier; Bernal-Calderón, María Olinda.
Título: Variabilidad de la frecuencia cardiaca: evaluación del entrenamiento deportivo. Revisión de tema / Heart rate variability: sports training evaluation. Theme review
Fonte: Duazary;16(2):259-269, 2019. tab.
Idioma: es.
Resumo: autónomo sobre el sistema cardiovascular; evalúa la capacidad de recuperación del sistema cardiovascular como respuesta al ejercicio físico. El análisis de los índices de la variabilidad de la frecuencia cardiaca refleja la respuesta autonómica cardiovascular a las diferentes cargas de entrenamiento. Esta revisión temática muestra las conclusiones y los protocolos de evaluación utilizados para controlar y evaluar el entrenamiento en atletas. La variabilidad de la frecuencia cardiaca fue analizada por los métodos de dominio tiempo y frecuencia. La búsqueda se realizó en las bases de datos de SCOPUS, PubMed y el motor de búsqueda Google Académico, utilizando las palabras clave "heart rate variability", "athletes" y "cardiac autonomic modulations". Los artículos seleccionados tuvieron como población objeto de estudio atletas de nivel competitivo de diferentes deportes. En conclusión, La evaluación de la variabilidad de la frecuencia cardiaca permite determinar la adaptación o inadaptación a las cargas de entrenamiento, programar el volumen y la intensidad adecuada de la carga de entrenamiento, supervisar el rendimiento a lo largo de los periodos de entrenamiento y monitorear el estado de forma deportiva durante los campeonatos en todos los deportes.

The heart rate variability is a non-invasive method to evaluate the response of the autonomic nervous system on the cardiovascular system; it assesses the recovery capacity of the cardiovascular system in response to physical exercise. The analysis of heart rate variability indices reflects the autonomic response to the different training loads. This thematic review shows the conclusions and evaluation protocols used to control and evaluate athletic training. The heart rate variability was analyzed by the time and frequency domain methods. The search was made in the databases of SCOPUS, PubMed and the Google Scholar search engine, using the keywords "heart rate variability", "athletes" and "cardiac autonomic modulations". The selected articles had as their target population athletes of competitive level of different sports. In conclusion, the evaluation of heart rate variability allows to determine the adaptation or non-adaptation to the training loads, to programme the appropriate volume and intensity of the training load, to supervise the performance throughout the training periods and monitor the performance sports during the championships.
Descritores: Exercício
-Frequência Cardíaca
Tipo de Publ: Revisão
Responsável: CO644.1 - Biblioteca Germán Bula Meyer


  6 / 2073 LILACS  
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Id: lil-767071
Autor: Silva, Anderson A; Lima, Daniela A; Vieira, Gabriella F; Fernandes, Aline A; Pereira, Danielle A. G.
Título: Assessment of intensity effort of middle-aged adults practicing regular walking
Fonte: Braz. j. phys. ther. (Impr.) = Rev. bras. fisioter;19(6):491-497, Nov.-Dec. 2015. tab.
Idioma: en.
Resumo: Background: Walking is one of the most commonly recommended activities for sedentary individuals. When performed at the correct intensity, it can provide cardiovascular, respiratory, metabolic, and other benefits by providing a training effect in addition to reducing the risk of death from cardiovascular diseases and other chronic health conditions. Objectives: The primary aim of this study was to assess whether individuals who practiced regular unsupervised walking carry out the activity safely and with sufficient effort intensity parameters to have a positive physiological (training) effect. The secondary objective was to compare the training heart rate (HR) and the stability of the HR within the ideal range of training between the sexes. Method: Individuals were selected from walking tracks within the city of Belo Horizonte, Brazil. The study included subjects from 40 to 60 years of age who had practiced walking for at least two months prior to the study, walking at least three times a week. Individuals who agreed to participate in the survey were asked to walk 15 minutes at their usual pace with their HR measured every 5 minutes using a heart rate monitor. Their average walking HR was compared to the average training HR based on the formula: (220 - age) × 70 to 80% that would result in a positive physiological training effect. Results: Of the 142 individuals evaluated, 25.4% achieved the average training HR. This result was significantly lower than those who did not achieve the average training HR while walking (p=0.002). There were significant differences between men and women who had reached the training HR (p=0.0001). Conclusion: The authors found that individuals who walk regularly performed outside the range of the ideal HR intensity that would cause a positive physiological effect and therefore would probably not achieve a beneficial training effect while walking.
Descritores: Caminhada
Terapia por Exercício/normas
Frequência Cardíaca/fisiologia
-Brasil
Terapia por Exercício/métodos
Limites: Seres Humanos
Adulto
Meia-Idade
Responsável: BR1.1 - BIREME


  7 / 2073 LILACS  
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Id: lil-767067
Autor: Tamburus, Nayara Y; Paula, Roberta F. L; Kunz, Vandeni C; César, Marcelo C; Moreno, Marlene A; Silva, Ester da.
Título: Interval training based on ventilatory anaerobic threshold increases cardiac vagal modulation and decreases high-sensitivity c-reative protein: randomized clinical trial in coronary artery disease
Fonte: Braz. j. phys. ther. (Impr.) = Rev. bras. fisioter;19(6):441-450, Nov.-Dec. 2015. tab, graf.
Idioma: en.
Projeto: Conselho Nacional de Desenvolvimento Científico e Tecnológico; . Conselho Nacional de Desenvolvimento Científico e Tecnológico; . Conselho Nacional de Desenvolvimento Científico e Tecnológico.
Resumo: Background: Autonomic dysfunction and inflammatory activity are involved in the development and progression of coronary artery disease (CAD), and exercise training has been shown to confer a cardiovascular benefit. Objective: To evaluate the effects that interval training (IT) based on ventilatory anaerobic threshold (VAT) has on heart rate variability (HRV) and high-sensitivity C-reactive protein (hs-CRP) levels, as well as the relationship between both levels, in patients with CAD and/or cardiovascular risk factors (RF). Method: Forty-two men (aged 57.88±6.20 years) were divided into two training groups, CAD-T (n= 12) and RF-T (n= 10), and two control groups, CAD-C (n= 10) and RF-C (n=10). Heart rate and RR intervals in the supine position, cardiopulmonary exercise tests, and hs-CRP levels were measured before and after IT. HRV was analyzed by spectral and symbolic analysis. The CAD-T and RF-T underwent a 16-week IT program of three weekly sessions at training intensities based on the VAT. Results: In the RF-T, cardiac sympathetic modulation index and hs-CRP decreased (p<0.02), while cardiac parasympathetic modulation index increased (p<0.02). In the CAD-T, cardiac parasympathetic modulation index increased, while hs-CRP, systolic, and diastolic blood pressures decreased (p<0.02). Both control groups showed increase in hs-CRP parameters (p<0.02). There was a strong and significant association between parasympathetic and sympathetic modulations with hs-CRP. Conclusion: The IT program based on the VAT promoted a decrease in hs-CRP associated with improvement in cardiac autonomic modulation.
Descritores: Nervo Vago/fisiopatologia
Pressão Sanguínea/fisiologia
Doença da Artéria Coronariana/reabilitação
Proteína C-Reativa/metabolismo
Limiar Anaeróbio
Doenças Cardiovasculares/fisiopatologia
Frequência Cardíaca/fisiologia
-Doença da Artéria Coronariana/fisiopatologia
Doença da Artéria Coronariana/metabolismo
Proteína C-Reativa/química
Resultado do Tratamento
Estimulação do Nervo Vago
Limites: Seres Humanos
Responsável: BR1.1 - BIREME


  8 / 2073 LILACS  
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Id: lil-792717
Autor: Sperling, Milena P. R; Simões, Rodrigo P; Caruso, Flávia C. R; Mendes, Renata G; Arena, Ross; Borghi-Silva, Audrey.
Título: Is heart rate variability a feasible method to determine anaerobic threshold in progressive resistance exercise in coronary artery disease?
Fonte: Braz. j. phys. ther. (Impr.) = Rev. bras. fisioter;20(4):289-297, July-Aug. 2016. tab, graf.
Idioma: en.
Projeto: CAPES; . FAPESP.
Resumo: ABSTRACT Background Recent studies have shown that the magnitude of the metabolic and autonomic responses during progressive resistance exercise (PRE) is associated with the determination of the anaerobic threshold (AT). AT is an important parameter to determine intensity in dynamic exercise. Objectives To investigate the metabolic and cardiac autonomic responses during dynamic resistance exercise in patients with Coronary Artery Disease (CAD). Method Twenty men (age = 63±7 years) with CAD [Left Ventricular Ejection Fraction (LVEF) = 60±10%] underwent a PRE protocol on a leg press until maximal exertion. The protocol began at 10% of One Repetition Maximum Test (1-RM), with subsequent increases of 10% until maximal exhaustion. Heart Rate Variability (HRV) indices from Poincaré plots (SD1, SD2, SD1/SD2) and time domain (rMSSD and RMSM), and blood lactate were determined at rest and during PRE. Results Significant alterations in HRV and blood lactate were observed starting at 30% of 1-RM (p<0.05). Bland-Altman plots revealed a consistent agreement between blood lactate threshold (LT) and rMSSD threshold (rMSSDT) and between LT and SD1 threshold (SD1T). Relative values of 1-RM in all LT, rMSSDT and SD1T did not differ (29%±5 vs 28%±5 vs 29%±5 Kg, respectively). Conclusion HRV during PRE could be a feasible noninvasive method of determining AT in CAD patients to plan intensities during cardiac rehabilitation.
Descritores: Doença da Artéria Coronariana/fisiopatologia
Limiar Anaeróbio
Exercício/fisiologia
Ácido Láctico/química
Treinamento de Resistência/métodos
Frequência Cardíaca/fisiologia
Limites: Seres Humanos
Idoso
Responsável: BR1.1 - BIREME


  9 / 2073 LILACS  
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Id: biblio-828288
Autor: Porta, Alberto; Takahashi, Anielle C. M; Catai, Aparecida M.
Título: Cardiovascular coupling during graded postural challenge: comparison between linear tools and joint symbolic analysis
Fonte: Braz. j. phys. ther. (Impr.) = Rev. bras. fisioter;20(5):461-470, Sept.-Oct. 2016. graf.
Idioma: en.
Resumo: ABSTRACT Background A joint symbolic analysis (JSA) is applied to assess the strength of the cardiovascular coupling from spontaneous beat-to-beat variability of the heart period (HP) and the systolic arterial pressure (SAP) during an experimental protocol inducing a gradual baroreflex unloading evoked by postural change (i.e. graded head-up tilt). Method: The adopted JSA can quantify the degree of association between the HP and SAP variabilities as a function of the time scale of the HP and SAP patterns. Traditional linear tools assessing the HP-SAP coupling strength, such as squared correlation coefficient, squared coherence function, and percentage of baroreflex sequences, were computed as well for comparison. Results: We found that: i) JSA indicated that the strength of the cardiovascular coupling at slow temporal scales gradually increased with the magnitude of the orthostatic challenge, while that at fast temporal scales gradually decreased; ii) the squared correlation coefficient and percentage of baroreflex sequences did not detect this behavior; iii) even though squared coherence function could measure the magnitude of the HP-SAP coupling as a function of the time scale, it was less powerful than JSA owing to the larger dispersion of the frequency domain indexes. Conclusion: Due to its peculiar features and high statistical power, JSA deserves applications to pathological groups in which the link between HP and SAP variabilities is lost or decreased due to the overall depression or impairment of the cardiovascular control.
Descritores: Postura/fisiologia
Sistema Nervoso Autônomo/fisiologia
Pressão Sanguínea/fisiologia
Barorreflexo/fisiologia
Frequência Cardíaca/fisiologia
Limites: Seres Humanos
Responsável: BR1.1 - BIREME


  10 / 2073 LILACS  
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Id: lil-788032
Autor: Soares, Antonio Henrique Germano; Farah, Breno Quintella; Cucato, Gabriel Grizzo; Bastos-Filho, Carmelo José Albanez; Christofaro, Diego Giulliano Destro; Vanderlei, Luiz Carlos Marques; Lima, Aluísio Henrique Rodrigues de Andrade; Ritti-Dias, Raphael Mendes.
Título: Is the algorithm used to process heart rate variability data clinically relevant? Analysis in male adolescents / O algoritmo utilizado para processamento de dados da variabilidade da frequência cardíaca é clinicamente relevante? Análise em adolescentes do gênero masculino
Fonte: Einstein (Säo Paulo);14(2):196-201tab.
Idioma: en.
Resumo: ABSTRACT Objective To analyze whether the algorithm used for the heart rate variability assessment (fast Fourier transform versus autoregressive methods) influenced its association with cardiovascular risk factors in male adolescents. Methods This cross-sectional study included 1,152 male adolescents (aged 14 to 19 years). The low frequency, high frequency components (absolute numbers and normalized units), low frequency/high frequency ratio, and total power of heart rate variability parameters were obtained using the fast Fourier transform and autoregressive methods, while the adolescents were resting in a supine position. Results All heart rate variability parameters calculated from both methods were different (p<0.05). However, a low effect size (<0.1) was found for all parameters. The intra-class correlation between methods ranged from 0.96 to 0.99, whereas the variation coefficient ranged from 7.4 to 14.8%. Furthermore, waist circumference was negatively associated with high frequency, and positively associated with low frequency and sympatovagal balance (p<0.001 for both fast Fourier transform and autoregressive methods in all associations). Systolic blood pressure was negatively associated with total power and high frequency, whereas it was positively associated with low frequency and sympatovagal balance (p<0.001 for both fast Fourier transform and autoregressive methods in all associations). Body mass index was negatively associated with high frequency, while it was positively associated with low frequency and sympatovagal balance (p values ranged from <0.001 to 0.007). Conclusion There are significant differences in heart rate variability parameters obtained with the fast Fourier transform and autoregressive methods in male adolescent; however, these differences are not clinically significant.

RESUMO Objetivo Analisar se o algoritmo usado para avaliação da variabilidade da frequência cardíaca (transformada rápida de Fourier versus autoregressivo) influencia em sua associação com fatores de risco cardiovascular adolescentes do gênero masculino. Métodos Estudo transversal, que incluiu 1.152 adolescentes do gênero masculino (14 a 19 anos). Componentes de baixa e alta frequência (absolutos e unidades normalizadas), razão componente de baixa frequência/componente de alta frequência e poder total da variabilidade da frequência cardíaca foram obtidos em repouso, na posição supina, usando os métodos transformada rápida de Fourier e autorregressivo. Resultados Todos os parâmetros da variabilidade da frequência cardíaca para ambos os métodos foram diferentes (p<0,05). Entretanto, um pequeno tamanho do efeito (<0,1) foi observado para todos os parâmetros. Os coeficientes de correlação intraclasse entre os métodos variaram de 0,96 a 0,99, enquanto os coeficientes de variação foram de 7,4 a 14,8%. A circunferência abdominal foi negativamente associada com o componente de alta frequência, e positivamente associada com o componente de baixa frequência e o balanço simpatovagal (p<0,001 para a transformada rápida de Fourier e o autorregressivo em todas as associações). A pressão arterial sistólica foi negativamente associada com o poder total e o componente de alta frequência, enquanto foi positivamente associada com o componente de baixa frequência e o balanço simpatovagal (p<0,001 para a transformada rápida de Fourier e o autorregressivo em todas as associações). O índice de massa corporal foi negativamente associado com o componente de alta frequência, enquanto foi positivamente associado com o componente de baixa frequência e o balanço simpatovagal (valores de p variando de <0,001 a 0,007). Conclusão Houve diferenças significantes nos parâmetros da variabilidade da frequência cardíaca obtidos com os métodos transformada rápida de Fourier e autorregressivo em adolescentes masculinos, mas essas diferenças não foram clinicamente significativas.
Descritores: Algoritmos
Técnicas de Diagnóstico Cardiovascular/normas
Frequência Cardíaca/fisiologia
-Índice de Massa Corporal
Estudos Transversais
Fatores de Risco
Circunferência da Cintura/fisiologia
Pressão Arterial/fisiologia
Análise de Fourier
Limites: Seres Humanos
Masculino
Adolescente
Adulto Jovem
Responsável: BR1.1 - BIREME



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