Laser Doppler flowmetry (LDF) signals give a peripheral view of the cardiovascular system. To better understand the
possible modifications brought by sleep apnea syndrome (SAS) in LDF signals, we herein propose to analyze the
complexity of such signals in obstructive SAS subjects, and to compare the results with those obtained in healthy
subjects. SAS is a pathology that leads to a drop in the parasympathetic tone associated with an increase in the
sympathetic tone in awakens SAS patients. Nine men with obstructive SAS and nine healthy men participated awaken in
our study and LDF signals were recorded in the forearm. In our work, complexity of LDF signals is analyzed through the
computation and analysis of their multifractal spectra. The multifractal spectra are estimated by first estimating the
discrete partition function of the signals, then by determining their Renyi exponents with a linear regression, and finally
by computing their Legendre transform. The results show that, at rest, obstructive SAS has no or little impact on the
multifractal spectra of LDF signals recorded in the forearm. This study shows that the physiological modifications
brought by obstructive SAS do not modify the complexity of LDF signals when recorded in the forearm.
Conference Committee Involvement (2)
Noise in Complex Systems and Stochastic Dynamics III
24 May 2005 | Austin, Texas, United States
Noise in Complex Systems and Stochastic Dynamics II
26 May 2004 | Maspalomas, Gran Canaria Island, Spain
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