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Imaging of power spectral heart rate variability regarding subject position
Kališnik, Jurij-Matija ...
Heart rate variability (HRV) and its assessment using power spectral analysis revealed a possibility to quantify the characteristics of autonomic nervous system, related cardiovascular status and ...sympathovagal interaction. This study was designed to assess vagal tone in supine and right recumbent positionin normal healthy subjects as many maneuvers that potentially increasevagal tone have been sought both in normal subjects and in patients with heart disease. Seven subjects, four male and three female, aged 20 - 27 years were enrolled in the study. To evaluate the time-dependent stability of short term ECG recordings, every subject participated in ix ECG recording sessions (three successive morning and three successive afternoon measurements). Heart rate power spectra were obtained by off line Fast FourierTransform analysis. The frequency domain measures, namely very low frequency power (VLF), low frequency power (LF), high frequency power (HF) andtotal power wexe determined, and their normalized correlates used in the Comparison between supine and right recumbent position. Normalized high frequency (nHF) indicated cardiac vagal activity, normalized low frequency power indexed sympathetic modulated activity, low frequency power / high frequency power ratio (LF/HF) represented sympathovagal balance. The results showed remarkable variation among successive day measurements as well as amongstudy subjects. However, several types of response to adopting right recumbent position could be identified. In the first, in right recumbent position the values of nHF, indicator of vagal activity did not differ appreciably from the values measured in supine position. Secondly, there was atendency towards higher nHF values and lower LF/HF power ratio in supine position. We were not able to notice any appreciable difference among morning and afternoon short-term measurements. Finally, our results do not suggest higher vagal modulation when lying in right recumbent pos
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