M.S. Zakharov - Head of Department of CJSC «Sberbank - Technology»
S.M. Zakharov - Dr.Sc. (Phys.-Math.), Professor, Head Research Scientist, OAO Institute of Electronic Control Computers of the I.S. Brooke's (INEUM)

The paper presents the research for healthy people of the Hurst exponent of time series of cardio intervals obtained by photoplethysmography. Photoplethysmograms were taken from a patient's finger using the device "Biomouse" representing the optoelectronic pair installed into a computer mouse. In the calculations we used the method of Hurst rescaled range. The number of initial data was chosen to be one hundred (equivalent to approximately 1.5 minute recording) and three hundred (five minute recording). Hurst exponent calculated using the least squares of the empirical dependence rescaled range as a function of the number of cardio intervals on a double logarithmic scale. The obtained values of the Hurst exponent and of the fractal dimension suggest persistence time series of cardio intervals.