Relation of heart rate variability to endothelial function in healthy subjects—Dependence upon cardiac cycle length

      Background: In various diseased states reduced cardiac vagal modulation (CVM) is accompanied by impaired endothelial function. It is unclear whether CVM and endothelial function undergo dysregulation independently, or these systems affect each other negatively as a consequence of the disease process. Since the respective physiology is unclear, as well, we aimed to investigate if such relationship between CVM and endothelial function exists in healthy subjects.
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