Abstract—This work was aimed at studying the effects of weak geomagnetic disturbances on systolic blood pressure, the R–R interval, the low-frequency and high-frequency components, and its ratio of heart rate variability spectrum under natural and shielded geomagnetic field conditions. All tests were performed with male Wistar rats placed in simulation and shielded chambers. In the simulation chamber, significant shifts in the parameters under study were observed on the days of geomagnetic disturbances: an increase in systolic blood pressure, as well as in the ratio of low- to high frequency components of the heart rate variability spectrum. In the shielded chamber, the parameters were not considerably different under quiet and disturbed geomagnetic field. In addition, in the stimulation chamber, the value of the mean daily barometric pressure was inversely correlated with systolic blood pressure; this relationship was significantly weakened under shielded geomagnetic field conditions. It was concluded that weak geomagnetic disturbances affect cardiovascular and autonomic nervous system functions. The authors hypothesize that the enhanced effect of a slight decrease in barometric pressure on systolic blood pressure in the natural geomagnetic field could be associated with the effect of geomagnetic activity on the mechanisms of blood oxygenation.
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The work was supported by the Basic Science Research Program of State Academies for 2014–2020 (GP-14, Section 63).
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Statement on the welfare of animals. All applicable international, national, and/or institutional guidelines for the care and use of animals were followed. Research conditions were coordinated with and approved by the Ethical Committee of the Center (no. 77 of 21.06.2010).
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Abbreviations: SBP, systolic blood pressure; ISI, inter-systolic interval; LF, low-frequency component of the heart rate variability spectrum; HF, high-frequency component of the heart rate variability spectrum.
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Kuzmenko, N.V., Shchegolev, B.F., Pliss, M.G. et al. The Influence of Weak Geomagnetic Disturbances on the Rat Cardiovascular System under Natural and Shielded Geomagnetic Field Conditions. BIOPHYSICS 64, 109–116 (2019). https://doi.org/10.1134/S0006350919010111
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DOI: https://doi.org/10.1134/S0006350919010111