Heart rate variability in the recovery after maximal exercise in young overweight

Abstract

The aimed this study was analyze the heart rate variability (HRV) in the active recovery in young with different body mass index (BMI) and it was associate the variables at rest and recovery. Eighteen young, eutrophic – E (22.36 ± 1.92 kg.m^-2) and overweight – O (29.71 ± 2.97 kg.m^-2) were assessed. The heart rate (HR) and the HRV index (RMSSD and SDNN) at rest, exercise and recovery after maximal exercise during 5 minutes, even as, the areas under the curve of the HRV were analyzed. The maximal oxygen uptake – VO_2máx – was lower (p<0.05) in the young overweight. The LnRMSSD_30s and LnSDNN_30s index at the end of the exercise (E: 0.46 ± 0.11 and 0.75 ± 0.12; O: 0.58 ± 1.15 and 0.73 ± 0.12 ms) were reduced compared to rest (E: 1.56 ± 0.11 and 1.72 ± 0.13; O: 1.42 ± 0.11 and 1.65 ± 0.23 ms) and have remained lower (p<0.05) at the end of the recovery (E: 0.54 ± 0.23 and 0.67 ± 0.24; O: 0.47 ± 0.23 and 0.67 ± 0.23 ms) without differences between groups. Moreover, the morphologic variables were associated (p<0.05) to aerobic fitness (r= -0.71 to -0.76), and the HR to HRV index in the different physiological moments. In conclusion, there was not vagal reactivation after 5 minutes of active recovery after a maximal exercise in young, with similar behavior between eutrophic and overweight. Also, morphological variables was associated inversely with the aerobic fitness, and the HR to HRV index in the different physiological moments.