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Illustration of the study protocol. q: Eight-item overtraining, Karolinska Sleepiness Scale Groningen Sleep Quality Scale questionnaires. Q: 14-item fatigue scale and Profile of Mood States questionnaires in addition to q. hrv: 3 min in supine position followed by 3 min in standing position orthostatic test. HRV: 6 min supine followed by 6 min standing orthostatic test. BPV, blood pressure variability; PVT, psychomotor vigilance task; PSG, polysomnography; PPG, photoplethysmography.
