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In order to investigate the potential of heart rate measures to reflect changes in the circadian rhythm or in sleepiness, an ultrashort sleep-wake experimental protocol was used to unmask circadianor sleepiness-related effects: Over a duration of 50 hours and always alternating, subjects attempted to fall asleep within 10 minutes and must stay awake in the following 20 minutes. Body temperature, as a representation of circadian rhythm, and heart rate were recorded continuously. During waking, subjects had rated their perceived sleepiness. Measures of heart rate (HR) and heart rate variability (HRV) in the time domain as well as spectral features and phase-space trajectory descriptors were computed over RR interval series and cross-correlated with body temperature and sleepiness. Heart rate, specific high-frequency spectral features and Poincaré descriptors of short-term HRV displayed the best overall coherence.

The relation of heart rate variability measures to psychophysiological variables with circadian rhythmicity