Studying the bioeffects of complexly organized electromagnetic impacts of low intensity

Abstract

Introduction. One of the modern tasks of hygienic assessment of the human environment is the accumulation of data on the bioeffects of electromagnetic fields (EMF), formed by the simultaneous action of several microwave sources. There is virtually no literature on the corresponding comparative analysis of the results of identical in conditions and energy effects on animals and humans. The purpose of this work is to compare bioeffects and analyze possible mechanisms of their formation, as a result of the action of electromagnetic fields (EMF) of one, two and three carrier frequencies, within 0.9-1.4 GHz with equivalent energy and modulation characteristics. Materials and methods. The work was performed in experiments on 11 rabbits (2.5-3 kg) of the Chinchilla breed and clinical- physiological studies involving 14 volunteers - men, aged 40-50 years. Irradiation was subjected mainly to the head of the object. The series differed in the number of carrier frequencies, their specific value and modulation within different EEG ranges, while maintaining an energy flux density (EPR) in the total pulse - 300 μW/cm2. We analyzed a set of indicators related to the functional assessment of central nervous, cardiovascular, respiration and muscular vbody systems. Results. The results on the dependence of the EMF effect of complex organization on the carrier frequency, their number and modulation nature are presented. It was established that each of the observed reactions was within the physiological norm, but along with the gain in the number of carrier frequencies and the specific modulation value, their qualitative and quantitative characteristics increased. Analysis of their phenomenology (of the alpha EEG range only at one carrier; + delta with a reflection of the reaction in other indicators - at two; an increase in the percentage of reactions in a complex of indicators, especially EMG - at three) indicated a different degree of synchronization of the bioelectric activity of the brain and the neurophysiological mechanism of their formation. The information obtained, of course, is limited to specific EMF parameters. It complements the relevant information available by highlighting the need for more research on a case-by-case basis. Limitations. The study of the phenomenology and mechanism of bioeffects of several low-intensity EMFs at the same time is a complex task that requires the involvement of a larger number of electromagnetic sources and a variety of indicators of the body’s response than this work was limited to and which, undoubtedly, is promising in the development of this area of research. Conclusion. In this study, there were no reactions that would go beyond the physiological norm. However, further strengthening of synchronization processes in the central nervous system, according to the analysis of the literature, can lead to such changes. This circumstance dictates the need to take it into account in the formation of the appropriate sanitary and hygienic assessment.