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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Choi, Y. Ko, S.-B. Sun, Y. |
| Copyright Year | 2006 |
| Description | Author affiliation: Dept. of Electr. & Comput. Eng., Rhode Island Univ., Kingston, RI (Choi, Y.) |
| Abstract | The effect of changing posture from supine to standing on the heart rate variability (HRV) was analyzed on the EUROBAVAR data set using power spectral analysis. Power spectral analysis has been commonly used to provide indices of autonomic cardiovascular modulation. Although the interpretation of power spectra is in dispute, it is generally agreed that the high-frequency (HF) power components represent the cardiac vagal modulation and the low-frequency (LF) power components are related to sympathetic activity. And then their ratio (LF/HF) is considered as an index of sympathovagal balance. In the supine lying position, relatively fast vagal activity plays a dominant role, whereas the upright standing position results in vagal inhibition and sympathetic predominance. Postural changing from supine to standing position showed the significant decrease in the indexes of vagal influence on HRV; HF power in both absolute and normalized unit decreased (320 to 121 $ms^{2}times10^{3}/Hz$ with P<0.005 and 49 to 37 n.u. with P<0.005, respectively) and LF/HF increased (1.4 to 2.65, P<0.005;. The baroreflex sensitivity (BRS) values were estimated by time sequence method, alpha-coefficients and transfer gains in LF and HF bands. There was a clear difference between BRS values in the supine and the standing positions with the averaged supine-to-standing BRS ratios of 2.35plusmn0.4. BRS estimates using HF components indicated higher values than LF analysis. With the evident decrease in normalized HF power and increase in LF/HF, the effect of changing positions to standing from supine lying can be concluded as a clear reduction in vagal influence on the heart rate variability |
| Starting Page | 110 |
| Ending Page | 114 |
| File Size | 125518 |
| Page Count | 5 |
| File Format | |
| ISBN | 1424400384 |
| DOI | 10.1109/CCECE.2006.277554 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 2006-05-07 |
| Publisher Place | Canada |
| Access Restriction | Subscribed |
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subject Keyword | Baroreflex Hafnium Heart rate variability Spectral analysis Rail to rail inputs Blood pressure Cardiology Heart rate Sun Autonomic nervous system autonomic nervous system Baroreflex regulation time sequence method power spectral analysis |
| Content Type | Text |
| Resource Type | Article |
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