Linear analysis of the heart rate variability before and after 16 weeks of training.

The values are presented as the means ± SD. RMSSD: square root of the mean squared differences between adjacent normal RR intervals, in a time interval; PNN50: percentage of adjacent RR intervals differing longer than 50 ms; LF: low frequency; HF: analysis of variance for repeated measures,*p≤0.05, p value: entre-group difference. Pos Hoc Bonferroni’s test. High-frequency, Wilcoxon Test: intra-group comparison, ANOVA: inter-group comparison.