Table 1. Descritive values (mean and standard deviation) of research in baseline. Variables Mean (SD) SDNN (ms) 64.2 (23.7) pNN50 (%) 21.7 (4.8) InRMSSD (ms) 3.6 (0.5) LF (n.u.) 51.7 (20.2) HF (n.u.) 52.2 (18.6) LF/HF 1.0 (0.2) CSAI-2R 30.1 (5.6) IPS (points) 754.3 (72.6) Age (years) 15.6 (0.2) BMI (kg/m²) 21.8 (1.7) %BF 20.4 (4.5) Training regimen (years) 10.6 (0.7) Note. SDNN = standard deviation of all N-N intervals; pNN50 = successive percentage of differences in R-R intervals greater than 50 ms; InRMSSD = logarithm of the difference of the quadratic mean of the successive normal R-R intervals; LFnu = corrected low frequency spectral component; HFnu = corrected high frequency spectral component; LF/HF = ratio between LF and HF; CSAI-2R = Competitive Anxiety Inventory; IPS = International Point Score; BMI = body mass index; %BF = body fat percentage.