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We verify the validity of the recently suggested universal superstatistical model for the modeling of the aggregated local network traffic. The empirical data set consists of 14 complete daily traffic logs obtained at the link between the Internet Service Provider (ISP) and the local subnet comprising part of the campus network of Ivanovo State University. We show explicitly that the superstatistical...
We studied the mutual dynamics of systolic blood pressure and pulse intervals. We used two approaches to estimate their stability, based either of phase difference analysis or on time delay stability analysis. In the first approach, we determined the intervals where the time delay of the maximum of the absolute value of the cross-correlation function of two analyzed processes remains stable. In the...
We studied the heart rate and the blood pressure responses to a stepwise physical stress with different intensity based on control system theory principles. We found that in a certain range of intensities both the heart rate and the blood pressure regulation can be represented by a simple linear feedback model. We suggest a typical response model to physical stress that is both reproducible and scalable...
We studied the dynamics of blood pressure and heart rate fluctuations during a head-up tilt testing in 127 patients and healthy individuals. To assess the regulation efficiency, in addition to the conventionally measured baroreflex sensitivity BRS, we also studied the stochastic phase synchronization coefficient Sync between short-term variations of the blood pressure and the heart rate estimated...
We studied the interrelation between the echocardiographic indices and the indices of collagenolysis system in 68 patients with progressive chronic heart failure with preserved ejection fraction and thick walls of the left ventricle. We found that while the tissue inhibitor TIMP-1 level is independent of the left ventricular dilation status, after being normalized to the individual matrix metalloproteinases...
The stress tests are used to reduce the influence of individual characteristics of the subjects on the quality of functional diagnostics of the condition of various body systems. The aim of the study was to develop methods and software for quantitative estimation of parameters of the motor response in children during tourniquet test. The quantitative characteristics of motor response for healthy children...
We aimed at studying the efficiency of blood pressure — heart rate feedback regulation, in particular the arterial baroreflex mechanism. We analyzed 150 short-term beat-to-beat recordings of blood pressure and pulse intervals and calculated their level of synchronization. We determined the synchronization coefficient as a fraction of the record fragments where the standard deviation of the Hilbert...
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