Relação entre a retirada e reativação vagal com a capacidade aeróbia em atletas de taekwondo DOI:10.5007/1980-0037.2010v12n1p8

Abstract

-The aim of this study was to evaluate the relationship between vagal withdrawal and reactivation indices and maximal running velocity (Vmax) ) 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 (τ, 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 τ 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.

Heart rate variability reproducibility during exercise

“…It appears that both methods of HRV quantification yield similarly reproducible indices of HRV during exercise. We thought that the time domain parameters would demonstrate a greater reproducibility as these are suggested to be less influenced by non-stationarities in the data (Pagani et al 1988, Perandini et al 2009, Asmussen and Kristiansson 1968). However, it must be noted that quantification of HRV in the frequency-domain requires pre-processing to improve the stability of the RR timeseries, and this might conceivably have improved the repeatability of the frequency-domain HRV measures.…”

Parasympathetic activity delayed after self‐paced exercise

“…In the present study, the faster HRR found in the first (HRR60s) and second (HRR120s) minutes after constant load exercise suggests that the beginning of passive recovery is also influenced by withdrawal of sympathetic activity (Danieli et al., 2014). The RMSSD 30s , a non‐stationary HRV index representing vagal modulation, was higher for some minutes after the constant workload exercise (Perandini et al., 2010). In addition, the higher value observed at 120 s may be related to the higher decay of heart rate at the same time in constant workload exercise.…”