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Fig. 1 | BMC Public Health

Fig. 1

From: Effects of a one-week vacation with various activity programs on well-being, heart rate variability, and sleep quality in healthy vacationers—an open comparative study

Fig. 1

HRV spectrogram of a study participant one day before the vacation: The red ellipsoidal marking indicates a low frequency density in the HF spectrum (0.15–0.4 Hz), whereas the weak yellow coloring indicates reduced nocturnal PNS activity. X-axis: time of the HRV analysis; y-axis: frequency spectrum in Hz; Hz: Hertz; HF: high frequency. This spectrogram shows poor sleep quality and diminished nocturnal parasympathetic activity

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BMC Public Health

ISSN: 1471-2458

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