During RTS, nocturnal RMSSD of SRC athletes (Mdn = 77.74 ms) showed a trend compared to controls (Mdn = 95.68 ms, p = 0.021, r = −0.382, p adjusted using false discovery rate = 0.126) and positively correlated to “drowsiness” (r = 0.523, p = 0.023, p adjusted = 0.046).
Correlations of Sleep-Associated Symptoms and Nocturnal Cardiac Parasympathetic Activity While “fatigue or low energy” was reported significantly more often in SRC than in control athletes, there was only a trend towards significance in the symptom “drowsiness.” Analysis showed a positive correlation between nocturnal RMSSD during RTS and “drowsiness” (r = 0.532, p = 0.023, p adj. = 0.046), while there was no correlation between RMSSD during RTS and “fatigue or low energy” (r = 0.257, p = 0.304, p adj. = 0.304). 4.