Modulation of the Sympatho-Vagal Balance during Sleep: Frequency Domain Study of Heart Rate Variability and Respiration.

Front Physiol · 2012 · PMC3299415 · PMID 22416233

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a clear trendno p-value reported

Anyway, a clear trend in the sympatho-vagal balance during the night could not be identified for the whole group: a shift toward the sympathetic component during REM sleep was more evident during the final sleep cycles for some subjects and during the initial ones for others.

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