Analysis on the Cyclical Fluctuations of the Blood Flow in the Microcirculation

In order to analyze the relationship between time series of the blood flow that has been measured in a small area of tissue and patterns of the blood flow fluctuations in the capillary unit, the autocorrelation coefficient model was established to characterize the continuity of blood flow based on the theory of autocorrelation coefficient. And it´s proved that if we take blood flow of a local tissue as a clustered sequences, which are made up of a number of capillary units with the same pseudo cycle and different phases, the sequence of microcirculation blood flow and the capillary unit have the same cycle fluctuations. Measured the blood flow of the human biceps in resting, denoised the signals through wavelet tranform, and derived the spectrum and pseudo cycle by Matlab. The character of blood flow fluctuations in a capillary unit can thus be estimated, which provided an effective way to find out character of the blood flow in the capillary unit.