Results from HRV analysis. Results for selected HRV parameters. Shown as boxes are median, first quartile, and third quartile. Whiskers extend to data points closest to 1.5 times the interquartile range. Outliers are marked as circles. Transversal post hoc tests (indicated by the existence of horizontal bars) were included for those time instants where the Kruskal-Wallis test showed significant group differences (cf. Table 3). Results from longitudinal post hoc testing were omitted in the graphic for clarity and are given in Table 4. * p<0.05; ** p<0.01; *** p<0.001.