Changes in heart rate variability (HRV) in patients with severe and moderate obstructive sleep apnea before and after acute CPAP therapy during nocturnal polysomnography.

Sleep Sci · 2020 · PMC7384525 · PMID 32742578

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a decreasing trendno p-value reported

Heart rate increases during the inhalation and shows a decreasing trend in the exhalation; hence, these changes affect the HF index.

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