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The different expression of respiratory sinus arrhythmia in REM- versus nonREM-sleep indicates a dependence of cardiorespiratory interaction on patterns of sleep. Investigations of the intensity of respiratory entrainment on heart rhythmicity during various stages of sleep will provide an insight into the coupling of cardiorespiratory interaction and sleep patterns. 42 healthy children (12 to 15 years old) were polygraphically investigated over 24 h. An ECG, EOG, and actogram were performed, respiratory movements were observed, and the skin temperature was taken. The power spectra of the instantaneous heart rate and the respirograms were calculated. The analysis of coherence was carried out to determine how pronounced the cardiorespiratory interaction is. REM-sleep, nonREM-phases, and wakefulness were compared. The spectral parameters of instantaneous heart rate show differences between both stages of sleep and the waking state. Due to a dependence of spectral power on breathing patterns, drawing quantitative conclusions is not possible. The analysis of coherence provides more information about sleep patterns within the cardiorespiratory interaction. It is very pronounced during non-REM-sleep (0.80 +/- 0.07; mean +/- standard deviation). Heart rhythmicity proceeds independent of breathing during REM-sleep (0.52 +/- 0.11). The coupling is weaker than during wakefulness (0.64 +/- 0.09).
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