IntroductionIt is known that from the physical point of view intrinsic electromagnetic radiation (IER) of a person is the result of fluctuations of microcharges and microcur rents generating random electromagnetic fields. Due to the absence of strict thermodynamic balance in biological tissues, the brightness temperature T i (t) of the electro magnetic radiation is a stochastic process and is deter mined by the electrophysical characteristics of biological tissues, the absorption coefficient χ(t), and the thermo dynamic temperature T(t) [1].Interaction of IER of the brain and regulatory mecha nisms and systems in the human body has been insufficient ly studied. This fully applies to the autonomic nervous sys tem (ANS), segmental departments of which are involved in the regulation of cerebral circulation and cognitive process es [2]. Gulyaev and Godik [3] formulated the hypothesis of parametric modulation of the intrinsic physical fields of a person by biochemical and biophysical processes of the body. The hypothesis was confirmed by results of experi mental studies [4, 5] obtained using methods of statistical and information analysis. In order to improve the quality of identification of these processes, appropriate mathematical methods of state diagnosis can be used, including the methodology of diagnostics of states described by dynamic series of characteristics [6]. In this case, the multifractal analysis of the signals enables obtaining of estimates that provide insight into the self organization of the signals and internal nonlinear dynamic processes [7]. This work is aimed at assessing the possibilities of application of multifractal formalism in the study of the role of autonomic regulation in the formation of IER of the brain.
Materials and MethodsTo solve this problem, an MRTRS 40 radiophysical complex [5] was used. The measuring system of the com The article discusses capabilities of a modified MRTRS 40 radiophysical complex for co processing of heart rate variability (HRV) signals and intrinsic electromagnetic radiation of the brain. It is shown that the use of multi fractal analysis for aggregate functional studies of HRV and intrinsic electromagnetic radiation of the brain enables estimation of the similarity of the following processes: − activity of the sympathetic division of the autonomic nervous system with periods of fluctuations in the range 6.5 25 s and fluid transport dynamics in the intercellular and intracellular spaces of brain tissues with periods of fluctuations ranging from 20 to 40 s; − activity of central ergotropic and humoral metabolic mechanisms of heart rate regulation, defined as very low frequency oscillations of HRV in the range from 25 to 300 s, and processes of thermodynamic regulation in the brain tissues with periods of fluctuations in the range 50 70 s. If a systematic discrepancy of these estimates cannot be considered insignificant, then a situation is character ized in which the role of autonomic regulation is reduced in brain functional processes.