Summary
the 2014 International Symposium on Nonlinear Theory and its Applications
2014
Session Number:C2L-D
Session:
Number:C2L-D4
Distinguishing Deterministic Chaos and Periodicity in Human Photoplethysmogram
Nina Sviridova, Kenshi Sakai,
pp.537-540
Publication Date:2014/9/14
Online ISSN:2188-5079
Summary:
The photoplethysmogram (PPG) is widely used in medical settings and sports equipment biological signal. PPG, which is measured noninvasively, can provide valuable information about cardiovascular system performance. The present study sought to investigate the underlying dynamics of healthy young human subjects’ PPG. In previous studies PPG was claimed to be driven by deterministic chaos; however, methods applied for chaos detection were noise sensitive and inconclusive. In this paper, methods of nonlinear time series analysis, including time delay embedding, nonlinear deterministic prediction and Wayland test were applied to PPG to find out whether the signal is driven by deterministic chaos, limit cycle process or nondeterministic process. Results demonstrated the presence of both deterministic chaos and limit cycle in the investigated PPG time series.