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Determinação do Limiar Anaeróbio de Pacientes com Doença Coronariana em Protocolos de Exercício em Esteira

DOI: http://dx.doi.org/10.15600/2238-1244/sr.v12n30p17-25

https://www.metodista.br/revistas/revistas-unimep/index.php/saude/index 

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Flávia C. R. Caruso1, Ana C. B. Siqueira2, Anielle C. M. Takahashi3, Luis A. Milan4, Aparecida M. Catai5 & Audrey B. Silva6

 

Resumo: Os objetivos deste estudo foram determinar o limiar anaeróbio por meio da frequência cardíaca e identificar a intensidade de esforço correspondente ao limiar anaeróbio em coronariopatas. Métodos: A amostra compôs-se de dez voluntários do sexo masculino com idade média de 61±10 anos, os quais realizaram aquecimento prévio e, posteriormente, um teste de exercício dinâmico com protocolo descontínuo em esteira, com duração de seis minutos em cada velocidade, começando a uma velocidade determinada por cada voluntário, com incrementos de 0,5 km/h até a identificação do limiar anaeróbio. A variabilidade da frequência cardíaca foi registrada em todas as intensidades do exercício, e o limiar anaeróbio, determinado pelo modelo semiparamétrico aplicado aos dados da frequência cardíaca. Foram calculadas a frequência cardíaca média e a variabilidade da frequência cardíaca por meio do índice RMSM. Resultados: foram encontradas diferenças significativas para a média da frequência cardíaca abaixo e acima do limiar anaeróbio (p<0,05). Para o índice RMSM houve aumento significativo do valor de repouso quando comparado às intensidades do exercício (p<0,05). Conclusão: a determinação do limiar anaeróbio em protocolo descontínuo em esteira é um método factível, e as intensidades 0,5 acima ou abaixo do limiar anaeróbio não acarretam em alterações importantes na modulação autonômica da frequência cardíaca.

Palavras-chave: exercício físico – reabilitação – frequência cardíaca – limiar anaeróbio.

 

Abstract: The objectives of this study were determine the anaerobic threshold by heart rate and identify the exercise intensity corresponding to anaerobic threshold in coronary artery disease. Methods: Th e sample consisted of ten male volunteers with mean age 61 ± 10 years, who underwent preheating and then a test protocol type discontinuous dynamic exercise on a treadmill, lasting for six minutes at each speed, starting at a rate determined by each volunteer, with increments of 0.5 km / h to identify the anaerobic threshold. The heart rate variability was recorded in all exercise intensities, and the anaerobic threshold, determined by the semiparametric model applied to heart rate data. We calculated the average heart rate and heart rate variability through the RMSM index. Results: Signifi cant diff erences were found for the values of heart rate below and above the anaerobic threshold (p<0.05). For index RMSM signifi cant increase in the value of rest compared the intensities of exercise (p<0.05). Conclusion: The determination of anaerobic threshold in discontinuous treadmill protocol is a feasible method and the 0.5 intensities above or below the anaerobic threshold did not cause major changes in autonomic modulation of heart rate.

Key words: physical exercise – rehabilitation – heart rate – anaerobic threshold. 

 

1 Mestranda em Fisioterapia Cardiovascular pela Universidade Federal de São Carlos (UFSCar) São Carlos/SP.
2 Universidade Federal de São Carlos (UFSCar) São Carlos/SP.
3 Docente do Departamento de Fisioterapia da Universidade Federal de São Carlos.
4 Universidade Federal de São Carlos (UFSCar) São Carlos/SP.
5 Docente do Departamento de Fisioterapia da Universidade Federal de São Carlos.
6 Docente do Departamento de Fisioterapia Cardiovascular Universidade Federal de São Carlos (UFSCar) São Carlos/SP.

 

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