Determinação das zonas de transição metabólica durante a corrida mediante os limiares de variabilidade da frequência cardíaca / Determination of transition metabolic zones during running using hert rate variability thresholds

AUTOR(ES)
DATA DE PUBLICAÇÃO

2011

RESUMO

The aim of the present study was to obtain evidences of validity and reliability of the thresholds of heart rate variability (HRV). Nineteen male subjects, healthy and runners (30,4 ± 4,1 years; 175,9 ± 6,4 cm; 74,3 ± 8,5 kg) performed a progressive maximal test on a treadmill with initial velocity 5 km.h-1 e increases of 1 km.h-1 every 3 minutes (1% slope) until voluntary exhaustion. All subjects performed the retest at an interval of time between 48 hours and one week. It was measured gas exchange, blood lactate and heart rate variability (Poincaré plot). The aerobic threshold (AT) and anaerobic (AnT) were determined by lactate, ventilatory and heart rate variability. ANOVA for repeated measures and post-hoc test of Bonferroni was used to compare the methods. To analyze the reproducibility of the variables were used the Bland- Altman plots and intraclass correlation coefficient (ICC). The results of this study show that the velocity at the second and third models employed to determine the AT by HRV were not significantly different (p >0.05) of the first lactate threshold and ventilatory. Similarly, there were no significant differences in the velocities corresponding to AnT detected by different methods (p>0.05). The ICC values were between 0.69 to 0.80 (p <0.001). We conclude that the AT and the AnT can be estimated by HRV analysis, since it utilizes the procedures employed in this study

ASSUNTO(S)

limiar anaeróbio aerobic threshold anaerobic threshold blood lactate consumo de oxigênio heart rate variability incremental test to exhaustion lactato sanguineo limiar aeróbio oxygen uptake teste progressivo até a exaustão variabilidade da frequência cardíaca

ACESSO AO ARTIGO

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