Relationship between vagal withdrawal and reactivation indices and aerobic capacity in taekwondo athletes

Relação entre a retirada e reativação vagal com a capacidade aeróbia em atletas de taekwondo

ORIGINAL ARTICLE

Relationship between vagal withdrawal and reactivation indices and aerobic capacity in taekwondo athletes

Relação entre a retirada e reativação vagal com a capacidade aeróbia em atletas de taekwondo

Luiz Augusto Perandini^I;II; Thiago Alfredo Siqueira-Pereira^I; Nilo Massaru Okuno^I; Lúcio Flávio Soares-Caldeira^I; Anthony S. Leicht^III; Fábio Yuzo Nakamura^I

^IUniversidade Estadual de Londrina, Departamento de Educação Física. Londrina, PR. Brazil

^IICentro Universitário Padre Anchieta, Jundiaí, SP, Brazil.

^IIIInstitute of Sport and Exercise Science, James Cook University, Townsville, Australia.

^{Correspondence to}

ABSTRACT

The aim of this study was to evaluate the relationship between vagal withdrawal and reactivation indices and maximal running velocity (Vmax) in taekwondo athletes. Eleven elite taekwondo athletes (seven men: 23.7±2.2 years, 72.4±7.0 kg, 178.8±7.5 cm, 51.9±2.9 ml.kg^-1.min^-1, and four women: 18.8±1.5 years, 61.8±1.8 kg, 168.0±4.4 cm, 41.6±2.4 ml.kg^-1.min^-1) performed a graded exercise test until exhaustion, with the last complete stage performed corresponding to Vmax. Heart rate variability (HRV) parameters were calculated at 1-minute intervals until 85% of maximum HR and plotted against time for the estimation of vagal withdrawal indices (t, amplitude (A) and area under the curve (AUC)). Vagal reactivation indices were determined based on HR recovery during the first 60 s (HRR60s) and negative reciprocal of the slope of the regression line obtained during the first 30 s of HRR (T30). The vagal withdrawal parameters A and AUC were moderately and significantly correlated with Vmax (r = 0.61-0.71, P < 0.05), whereas t presented a low correlation (r = 0.22-0.40, P > 0.05). T30 and HRR60s were also significantly correlated with Vmax (r = -0.77 and 0.64, P < 0.05, respectively). The present results showed that vagal withdrawal (A and AUC) and vagal reactivation (T30 and HRR60s) indices were significantly correlated with Vmax, suggesting that these indices can be used for the evaluation and monitoring of aerobic fitness in taekwondo athletes.

Keywords: Exercise; Heart rate; Combat sports

RESUMO

O objetivo deste estudo foi verificar em atletas de taekwondo a relação entre a retirada e reativação vagal com a velocidade aeróbia máxima (Vmax). Onze atletas de elite de taekwondo (sete homens: 23,7±2,2 anos, 72,4±7,0 kg, 178,8±7,5 cm, 51,9±2,9 ml.kg^-1.min^-1; e quatro mulheres: 18,8±1,5 anos, 61,8±1,8 kg, 168,0±4,4 cm, 41,6±2,4 ml.kg^-1.min^-1) realizaram um teste progressivo até exaustão, sendo a Vmax considerada o último estágio completo realizado. Os parâmetros da variabilidade da freqüência cardíaca (VFC) foram calculados a cada minuto do teste até o atingimento de 85% da FC máxima, e plotados contra o tempo para a estimativa dos indicadores de retirada vagal (t, amplitude (A) e área sob a curva (ASC)). Os indicadores de reativação vagal foram determinados pela recuperação da FC nos primeiros 60 s (RFC60s) e recíproca negativa da reta de regressão linear obtida pela RFC dos primeiros 30 s (T30). Os parâmetros de retirada vagal A e ASC foram moderado e significativamente correlacionados à Vmax (r = 0,61-0,71, P < 0,05), enquanto o t apresentou baixa correlação (r = 0,22-0,40, P > 0,05). O T30 e RFC60s apresentaram correlação significante com a Vmax (r = -0,77 e 0,64, P < 0,05, respectivamente). Os resultados do presente estudo mostraram que os indicadores da retirada (A e ASC) e reativação vagal (T30 e RFC60s) foram significativamente correlacionados com a Vmax, sugerindo que esses indicadores poderiam ser utilizados na avaliação aeróbia e monitoramento do treinamento de atletas de taekwondo.

Palavras-chave: Exercício; Freqüência cardíaca; Esportes de combate

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ACKNOWLEDGEMENTS

We thank Henrique Bortolotti and Nelson Rodrigues (Química/UEL) for technical assistance during data collection.

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Recebido em 22/06/09

Aprovado em 06/08/09

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Publication Dates

• Publication in this collection
  06 Feb 2013
• Date of issue
  Feb 2010

History

• Received
  22 June 2009
• Accepted
  06 Aug 2009