Abstract
The synchronization of mice motor activity, which reflects the activity–rest cycle, with variations in the X component of the geomagnetic field vector (BOXX) in the range of fluctuations from 10 to 120 min has been studied. The percentage of pixels on the video recording that changed their intensity within 10 s is used as an indicator of motor activity. The experiment was performed simultaneously on 16 males of the C57BL/6 line in October 2019 in Moscow. The mice were kept single in a plastic box (t = 22–26°С) under an artificial 12-h light regime and free access to water and food. The degree of similarity of the rhythm of biological and BOXX indicators is analyzed for each animal by evaluating the degree of similarity of their Fourier spectra for each 12-h day and night intervals. An analysis of the time series averaged over the group showed that almost all harmonics in the interval of 50–120 min correspond to equal harmonics of the BOXX. The cross-correlation function of two series has a statistically significant absolute maximum with a zero time lag between the series. On average, 18% of individual segments show statistically significant correlation between the spectra of activity–rest cycle and BOXX. This result indicates the adjustment of the biological rhythm for the variations of the geophysical one, which corresponds to the effect of adjusting the rhythms of heart and brain human activity to an external rhythm generator, the geomagnetic field.
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ACKNOWLEDGMENTS
The results presented in this article are based on data collected from magnetic observatories. We thank the national institutions supporting the observatories and the leadership of the INTERMAGNET international network for promoting the high standards of practice in magnetic observatories (www.intermagnet.org).
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This study was supported by the state budget and partly with financial support from the Russian Foundation for Basic Research, project no. 20-013-00603a.
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Translated by T. Kuznetsova
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Dorokhov, V.B., Arseniev, G.N., Sakharov, D.S. et al. Synchronization of Activity–Rest Cycle Indicators in Mice with Geomagnetic Field Variations in the Millihertz Frequency Range. Izv. Atmos. Ocean. Phys. 57, 1308–1321 (2021). https://doi.org/10.1134/S0001433821100029
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DOI: https://doi.org/10.1134/S0001433821100029