Multifractal spectra of laser Doppler flowmetry signals in healthy and sleep apnea syndrome subjects

Benjamin Buard; Wojciech Trzepizur; Guillaume Mahe; François Chapeau-Blondeau; David Rousseau; Frédéric Gagnadoux; Pierre Abraham; Anne Humeau

doi:10.1117/12.831901

17 July 2009 Multifractal spectra of laser Doppler flowmetry signals in healthy and sleep apnea syndrome subjects

Benjamin Buard, Wojciech Trzepizur, Guillaume Mahe, François Chapeau-Blondeau, David Rousseau, Frédéric Gagnadoux, Pierre Abraham, Anne Humeau

Author Affiliations +

Proceedings Volume 7373, Therapeutic Laser Applications and Laser-Tissue Interactions IV; 73730P (2009) https://doi.org/10.1117/12.831901
Event: European Conferences on Biomedical Optics, 2009, Munich, Germany

Abstract

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.

Citation Download Citation

Benjamin Buard, Wojciech Trzepizur, Guillaume Mahe, François Chapeau-Blondeau, David Rousseau, Frédéric Gagnadoux, Pierre Abraham, and Anne Humeau "Multifractal spectra of laser Doppler flowmetry signals in healthy and sleep apnea syndrome subjects", Proc. SPIE 7373, Therapeutic Laser Applications and Laser-Tissue Interactions IV, 73730P (17 July 2009); https://doi.org/10.1117/12.831901

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available

Members: $17.00

Non-members: $21.00 ADD TO CART

PROCEEDINGS
7 PAGES

DOWNLOAD PAPER SAVE TO MY LIBRARY

GET CITATION

RIGHTS & PERMISSIONS

Get copyright permission Get copyright permission on Copyright Marketplace

KEYWORDS

Doppler effect

Blood

Cardiovascular system

Pathology

Signal analyzers

Skin

Blood circulation

Show All Keywords

Keywords/Phrases

Search In:

Publication Years