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Dynamics of Brain Potentials in Volunteers for Modeled Head-to-Pelvis G-Loads (+Gz) on a Short-Arm Human Centrifuge

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Abstract

To develop an on-board version of a short-arm human centrifuge (SAHC) as a source of artificial gravity on board manned space vehicles, a series of head-to-pelvis +Gz runs was performed on a SAHC at the Institute of Biomedical Problems, Russian Academy of Sciences. Nine male volunteers participated in a three-stage experiment with exposure to 2.1, 2.41, and 2.92 g. The electroencephalogram (EEG) was monitored during SAHC runs. The classical visual EEG analysis revealed specific changes in the bioelectrical activity of the brain, which manifested themselves in the EEG recordings as a characteristic and specific pattern for each volunteer. Spectral analysis provided information on the dynamics of relative power values (RPV) of the EEG spectrum delta-2 (2–4 Hz), theta (4–8 Hz), alpha (8–13 Hz), and beta-1 (13–24 Hz) bands in total for all 19 leads. The results showed that the totality of changes in the RPV of the EEG delta-2-, theta-, alpha-, and beta-1 bands for all leads made it possible to trace the dynamics of brain functioning under various modes of +Gz simulation on a SAHC. The greatest 15.5% decrease in the theta RPV with a simultaneous 8.4% increase in the beta RPV at maximum load was evidence of activation of the cerebral cortex due to attenuation of the inhibitory effect of the nonspecific brain system on it. Neurophysiological individual typological features, as well as the absence of changes in the alpha-band RPV in EEG patterns in the group of volunteers as a whole, indicated a fairly successful adaptation of the CNS to g-loads in all SAHC runs.

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ACKNOWLEDGMENTS

This work was supported by the project of the Russian Academy of Sciences no. 63.2 “The study of integrative processes in the central nervous system, patterns of behavior and human activity in conditions of autonomy and under the influence of other extreme environmental factors.”

Funding

This work was supported by ongoing institutional funding. No additional grants to carry out or direct this particular research were obtained.

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Authors and Affiliations

  1. State Research Center of the Russian Federation, Institute of Biomedical Problems, Russian Academy of Sciences, Moscow, Russia

    D. V. Schastlivtseva, T. I. Kotrovskaya, M. I. Koloteva & T. M. Glebova

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  1. D. V. Schastlivtseva
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  2. T. I. Kotrovskaya
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  3. M. I. Koloteva
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  4. T. M. Glebova
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Correspondence to D. V. Schastlivtseva.

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The authors of this work declare that they have no conflicts of interest.

ETHICS APPROVAL AND CONSENT TO PARTICIPATE

All procedures performed in studies involving human participants were in accordance with the biomedical ethics principles formulated in the 1964 Helsinki Declaration and its later amendments and approved by the local Ethics Committee of the Institute of Biomedical Problems, Russian Academy of Sciences (Moscow). Each study participant provided a signed voluntary written informed consent after explanation of the potential risks and benefits, as well as the nature of the upcoming study, to him.

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Translated by E. Babchenko

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Schastlivtseva, D.V., Kotrovskaya, T.I., Koloteva, M.I. et al. Dynamics of Brain Potentials in Volunteers for Modeled Head-to-Pelvis G-Loads (+Gz) on a Short-Arm Human Centrifuge. Hum Physiol 49, 819–824 (2023). https://doi.org/10.1134/S0362119723070137

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