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With the aim of better understanding the dynamic changes in sympatho-vagal tone occurring during the night, human heart rate variability (HRV) during the various sleep stages was evaluated by means of autoregressive spectral analysis. Each recording consisted of an electroencephalogram, an electrooculogram, and electromyogram, and electrocardiogram, and a spirometry trace. All of the data were sampled and stored in digital form. Sleep was analysed visually, but HRV was analysed off-line by means of original software using Burg's algorithm to calculate the LF/HF ratio (LF: 0.04-0.12 Hz; HF: 0.15-0.35 Hz) for each sleep stage. Seven healthy subjects (four males; mean age 35 years) were enrolled in the study. Our findings show a progressive and significant reduction in the LF/HF ratio through sleep stages S1-S4, as a result of an increase in the HF component; this indicates the prevalence of parasympathetic activity during slow-wave sleep. During wakefulness, S1 and REM, the LF/HF values were similar and close to 1.
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P F Gangemi, and
A Parigi, and
R Silipo, and
P Ragghianti, and
E Sirabella, and
M Morelli, and
L Bagnoli, and
R Vergassola, and
G Zaccara
December 2013,
Sleep,
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P F Gangemi, and
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P Ragghianti, and
E Sirabella, and
M Morelli, and
L Bagnoli, and
R Vergassola, and
G Zaccara
January 2017,
Technology and health care : official journal of the European Society for Engineering and Medicine,
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P F Gangemi, and
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G Zaccara
March 2022,
Entropy (Basel, Switzerland),
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P F Gangemi, and
A Parigi, and
R Silipo, and
P Ragghianti, and
E Sirabella, and
M Morelli, and
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R Vergassola, and
G Zaccara
February 2016,
Chaos (Woodbury, N.Y.),
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P F Gangemi, and
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G Zaccara
January 2000,
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G Zaccara
March 2023,
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