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Título: Identification of anaerobic threshold using heart rate response during dynamic exercise
Autor(es): Marães, Vera Regina Fernandes Silva
Silva, Ester da
Catai, Aparecida Maria
Silva, Luciana Duarte Novais
Moura, Maria Aparecida
Oliveira, Lucien de
Gallo Júnior, Lourenço
Assunto: Batimento cardíaco
Coração - contração
Exercícios físicos
Sistema cardiovascular
Limiar anaeróbio
Data de publicação: Mai-2005
Editora: Associação Brasileira de Divulgação Científica
Referência: MARAES, Vera Ramos Fernandes Silva. et al. Identification of anaerobic threshold using heart rate response during dynamic exercise. Brazilian Journal of Medical and Biological Research, Ribeirão Preto, v. 38, n. 5, maio 2005. Disponível em: <http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2005000500010&lng=pt&nrm=iso>. Acesso em: 07 nov. 2012. http://dx.doi.org/10.1590/S0100-879X2005000500010.
Resumo: The objective of the present study was to characterize the heart rate (HR) patterns of healthy males using the autoregressive integrated moving average (ARIMA) model over a power range assumed to correspond to the anaerobic threshold (AT) during discontinuous dynamic exercise tests (DDET). Nine young (22.3 ± 1.57 years) and 9 middle-aged (MA) volunteers (43.2 ± 3.53 years) performed three DDET on a cycle ergometer. Protocol I: DDET in steps with progressive power increases of 10 W; protocol II: DDET using the same power values as protocol 1, but applied randomly; protocol III: continuous dynamic exercise protocol with ventilatory and metabolic measurements (10 W/min ramp power), for the measurement of ventilatory AT. HR was recorded and stored beat-to-beat during DDET, and analyzed using the ARIMA (protocols I and II). The DDET experiments showed that the median physical exercise workloads at which AT occurred were similar for protocols I and II, i.e., AT occurred between 75 W (116 bpm) and 85 W (116 bpm) for the young group and between 60 W (96 bpm) and 75 W (107 bpm) for group MA in protocols I and II, respectively; in two MA volunteers the ventilatory AT occurred at 90 W (108 bpm) and 95 W (111 bpm). This corresponded to the same power values of the positive trend in HR responses. The change in HR response using ARIMA models at submaximal dynamic exercise powers proved to be a promising approach for detecting AT in normal volunteers.
Licença: Brazilian Journal of Medical and Biological Research - Todo o conteúdo deste periódico, exceto onde está identificado, está licenciado sob uma Licença Creative Commons(Attribution-NonCommercial 3.0 Unported (CC BY-NC 3.0)). Fonte: http://www.scielo.br/scielo.php?script=sci_serial&pid=0100-879X&lng=pt&nrm=iso. Acesso em: 07 nov. 2012.
DOI: http://dx.doi.org/10.1590/S0100-879X2005000500010
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