Fig. 1

Nocturnal RMSSD and sleep storms during and post return to sport (RTS) for regular (rRTS), prolonged (pRTS), and control athletes. * = significant differences between pRTS and control athletes; a = significant differences between rRTS and pRTS athletes (applying Kruskal-Wallis Test with Post-hoc tests (Dunn-Bonferroni-Tests)).