Abstract
Here, we studied changes in pain sensitivity in rats subjected to low-intensity millimeter-wavelength electromagnetic radiation (EMR MM) of 7.1 mm and 0.1 mW/cm2 in the occipital-collar region with daily exposure of 30 min over 21 days. As well, this radiation was combined with moderate electromagnetic shielding (EMS) which had the following parameters. The shielding coefficients of the constant component of the magnetic field along the vertical and horizontal constituents were 4.4- and 20-fold, respectively, with an exposure of 22 h/day over 21 days. The pain sensitivity was estimated with algometric tests, that is, the hot plate, flick-tail, and algesimeter-pincher tests; these allowed observation of the pain impulse at different regulatory levels. The algological effects of both individual and combined EMR MM and EMS were demonstrated. It was shown that EMR MM has an antinociceptive property when combined with EMS, as well as a modulation effect caused by shielding during hyperalgesia. At the same time, shielding reduces the antinociceptive effect of EMR MM.
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Funding
This study was supported within the initiative part of the federal program of the Minister of Science and Education of Russian Federation: Temporal Organization of Human and Animal Physiological Systems: Phenomenology and Mechanisms of Generation and Regulation of micro- and meso-rhythms (project no. 6.5452.2017/8.9).
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Statement on the welfare of animals. This study was performed in accordance with GOST R-53434-2009 of Basics of Relevant Laboratory Practice and rules of the European Convention for the protection of vertebrate animals used for experimental and other scientific purposes.
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Translated by A. Boutanaev
Abbreviations: EMR is electromagnetic radiation; EMR MM is millimeter-wavelength electromagnetic radiation; EMS is electromagnetic shielding; PRLtft ispain response latency in a tail-flick test; Fpul is mechanical pain threshold; PRLhpt is pain response latency in a hot plate test.
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Chuyan, E.N., Dzheldubaeva, E.R. & Tribrat, N.S. The Effects of Low-Intensity Millimeter-Wavelength Radiation and Electromagnetic Shielding on Pain Sensitivity in Rats. BIOPHYSICS 65, 505–513 (2020). https://doi.org/10.1134/S0006350920030033
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DOI: https://doi.org/10.1134/S0006350920030033