Fig. 1

Impact of corrective filters on overview heart rate variability parameters. Values are presented as mean ± SD or median and interquartile range (10th–90th percentiles). +: represents the mean. PNS: parasympathetic nervous system; sympathetic nervous system. aSignificant statistical difference compared to none; bsignificant statistical difference compared to very low; csignificant statistical difference compared to low; dsignificant statistical difference compared to medium; esignificant statistical difference compared to strong. Statistical significance (p < 0.05) for repeated-measures ANOVA (Tukey–Kramer post-hoc) or Friedman test (Dunn’s post-hoc)..