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Fig. 2 | BMC Public Health

Fig. 2

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. 2

HRV spectrogram of the same study participant after the one-week vacation: The red ellipsoidal marking highlights the increased frequency density in the HF spectrum (0.15–0.4 Hz). Increasing yellow and light red coloring express good nocturnal parasympathetic activity. X-axis: time of the HRV analysis; y-axis: frequency spectrum in Hz; Hz: Hertz; HF: high frequency. This spectrogram shows improved sleep quality with demonstrable nocturnal parasympathetic activity

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BMC Public Health

ISSN: 1471-2458

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