Multifractality in the peripheral cardiovascular system from pointwise holder exponents of laser Doppler flowmetry signals
Multifractality in the peripheral cardiovascular system from pointwise holder exponents of laser Doppler flowmetry signals
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DOI：
10.1529/biophysj.107.119057
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发表时间：
2007-12-15
影响因子：
3.4
通讯作者：
Abraham, Pierre
中科院分区：
文献类型：
--
作者：
Humeau, Anne;Chapeau-Blondeau, Francois;Abraham, Pierre
我们研究皮肤激光多普勒血流测量信号的动态，提供心血管系统的外围视图。 Holder 指数的分析表明，年轻健康受试者在休息时的实验信号呈弱多重分形。我们对基于具有线性耦合和波动的非线性耦合振荡器的心血管系统标准理论模型生成的数据进行相同的分析。我们表明，该理论模型虽然捕捉了动力学的基本特征，但还不够复杂，无法反映微血管机制的多重分形不规则性。
We study the dynamics of skin laser Doppler flowmetry signals giving a peripheral view of the cardiovascular system. The analysis of Holder exponents reveals that the experimental signals are weakly multifractal for young healthy subjects at rest. We implement the same analysis on data generated by a standard theoretical model of the cardiovascular system based on nonlinear coupled oscillators with linear couplings and fluctuations. We show that the theoretical model, although it captures basic features of the dynamics, is not complex enough to reflect the multifractal irregularities of microvascular mechanisms.