Tao Lei, Maogang Jiang, Yue Tian, Kangning Xie, Feijiang Li, Da Jing, Yili Yan, Guanghao Shen, Erping Luo
Wavelet transform, Laser Doppler, Skin blood flux,Microcirculation, Magnetic field
The traditional parameters to evaluate human microcirculation such as mean values of skin blood flux (SBF) and velocity of skin blood flow measured by laser Doppler flowmetry (LDF) failed to find the biological effects of magnetic field (MF) on human microcirculation according to numerous researches. Although this inefficacy of MF indicated by these traditional parameters, other potential parameters were seldom investigated. Therefore, this study aimed to find other potential parameters by using time-frequency analysis as indicators to investigate whether MF affects human microcirculation in future studies. Continuous wavelet transform which has superior frequency resolution in low frequency band was applied in present study to convert two dimensional data of flux signal with low frequency band into three dimensional data involving the temporal and frequency information of the original signal. Six characteristic peaks identified relating to microvascular mechanism were recognized in the frequency interval between 0.005 and 2 Hz and the amplitude of each peak varied with time. This method may provide a new idea and method for the analysis and processing human SBF signal and lay a foundation for future study of MF effects on human microcirculation. However, more studies are needed to demonstrate the interesting and encouraging effects of MF on untraditional parameters such as wavelet coefficients of SBF signal and to explain the precise action mechanism of MF on human microcirculation.
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