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Proceedings Paper

Time-frequency analysis of heart rate variability in elderly people
Author(s): Herbert C. Sager; Juergen Guntermann
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Paper Abstract

Assessment of the ability of the autonomic nervous system (ANS) to regulate blood pressure (BP). This is of particular importance for elderly people, for whom the project was designed. We measure a patient's BP noninvasively under various conditions: deep respiration, passive tilt, etc. The variability of the heart rate in the lower frequency band (LF) (0.04 - 0.15 Hz) is known to have sympathetic- and parasympathetic origin, while in the higher (HF) (0.15 - 0.4 Hz) it is vagally mediated. We do a Time-Frequency analysis for the two frequency bands (Wigner) and eliminate the 'cross-terms' with a novel method due to Qian and Chen. We obtain a clear resolution of the activity in LF and HF over time. Research is ongoing aiming at identifying unambiguously the sympathetic and vagal activity.

Paper Details

Date Published: 21 November 2001
PDF: 8 pages
Proc. SPIE 4591, Electronics and Structures for MEMS II, (21 November 2001); doi: 10.1117/12.449167
Show Author Affiliations
Herbert C. Sager, Fachhochschule Aargau (Switzerland)
Juergen Guntermann, Fachhochschule Aargau (Switzerland)

Published in SPIE Proceedings Vol. 4591:
Electronics and Structures for MEMS II
Neil W. Bergmann; Derek Abbott; Alex Hariz; Vijay K. Varadan, Editor(s)

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