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Using Modified Sample Entropy to Characterize Aging-Associated Microvascular Dysfunction.

Fuyuan Liao1, Yih-Kuen Jan2

  • 1Department of Biomedical Engineering, Xi'an Technological UniversityXi'an, China; Rehabilitation Engineering Lab, Department of Kinesiology and Community Health, University of Illinois at Urbana-ChampaignChampaign, IL, USA.

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|May 6, 2016
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Summary
This summary is machine-generated.

A new modified Sample Entropy (SampEn) method accurately measures skin blood flow (SBF) dynamics, overcoming limitations of standard methods. This approach reveals higher blood flow regularity in older adults and during vasodilation.

Keywords:
agingblood flow oscillationscomplexitysample entropyskin blood flow

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Area of Science:

  • Physiology
  • Biomedical Engineering
  • Nonlinear Dynamics

Background:

  • Cutaneous microvascular function is assessed via skin blood flow (SBF) response to thermal stimuli.
  • Spectral analysis quantifies regulatory mechanisms but misses nonlinear dynamics.
  • Standard Sample Entropy (SampEn) is sensitive to sampling rates, potentially yielding misleading results for oversampled data.

Purpose of the Study:

  • To address the limitations of standard SampEn in analyzing oversampled time series data.
  • To introduce a modified SampEn approach for robust assessment of nonlinear dynamics in SBF signals.
  • To evaluate the modified SampEn's performance in characterizing microvascular function across different age groups.

Main Methods:

  • Modified the SampEn definition by incorporating a lag, chosen via the auto mutual information function, to mitigate oversampling issues.
  • Tested the modified SampEn using simulated time series data and actual skin blood flow (SBF) data from young and old adults.
  • Compared the performance of modified SampEn against standard SampEn across varying sampling rates.

Main Results:

  • Modified SampEn demonstrated consistent results across different sampling rates for simulated data, unlike standard SampEn.
  • Skin blood flow data exhibited increased regularity during maximal vasodilation compared to baseline in both age groups.
  • Older adults showed higher SBF regularity than younger adults, with enhanced cardiac oscillations contributing to this during peak vasodilation.

Conclusions:

  • The modified SampEn approach provides reliable and consistent nonlinear analysis of time series data, even with varying sampling rates.
  • This method enhances the characterization of cutaneous microvascular function by quantifying blood flow oscillations.
  • The findings suggest modified SampEn is a valuable tool for assessing microvascular regulatory mechanisms, particularly in aging research.