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Sensitivity of Visual System in 5-Day “Dry” Immersion With High-Frequency Electromyostimulation

The aim of this work was to study the sensitivity of the visual system in 5-day “dry” immersion with a course of high-frequency electromyostimulation (HFEMS) and without it. “Dry” immersion (DI) is one of the most effective models of microgravity. DI reproduces three basic effects of weightlessness:...

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Autores principales: Shoshina, Irina, Zelenskaya, Inna, Karpinskaia, Valeriia, Shilov, Yuri, Tomilovskaya, Elena
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Frontiers Media S.A. 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8740068/
https://www.ncbi.nlm.nih.gov/pubmed/35002633
http://dx.doi.org/10.3389/fncir.2021.702792
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author Shoshina, Irina
Zelenskaya, Inna
Karpinskaia, Valeriia
Shilov, Yuri
Tomilovskaya, Elena
author_facet Shoshina, Irina
Zelenskaya, Inna
Karpinskaia, Valeriia
Shilov, Yuri
Tomilovskaya, Elena
author_sort Shoshina, Irina
collection PubMed
description The aim of this work was to study the sensitivity of the visual system in 5-day “dry” immersion with a course of high-frequency electromyostimulation (HFEMS) and without it. “Dry” immersion (DI) is one of the most effective models of microgravity. DI reproduces three basic effects of weightlessness: physical inactivity, support withdrawal and elimination of the vertical vascular gradient. The “dry” immersion included in the use of special waterproof and highly elastic fabric on of immersion in a liquid similar in density to the tissues of the human body. The sensitivity of the visual system was assessed by measuring contrast sensitivity and magnitude of the Müller-Lyer illusion. The visual contrast sensitivity was measured in the spatial frequency range from 0.4 to 10.0 cycles/degree. The strength of visual illusion was assessed by means of motor response using “tracking.” Measurements were carried out before the start of immersion, on the 1st, 3rd, 5th days of DI, and after its completion. Under conditions of “dry” immersion without HFEMS, upon the transition from gravity to microgravity conditions (BG and DI1) we observed significant differences in contrast sensitivity in the low spatial frequency range, whereas in the experiment with HFEMS—in the medium spatial frequency range. In the experiment without HFEMS, the Müller-Lyer illusion in microgravity conditions was absent, while in the experiment using HFEMS it was significantly above zero at all stages. Thus, we obtained only limited evidence in favor of the hypothesis of a possible compensating effect of HFEMS on changes in visual sensitivity upon the transition from gravity to microgravity conditions and vice versa. The study is a pilot and requires further research on the effect of HFEMS on visual sensitivity.
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spelling pubmed-87400682022-01-08 Sensitivity of Visual System in 5-Day “Dry” Immersion With High-Frequency Electromyostimulation Shoshina, Irina Zelenskaya, Inna Karpinskaia, Valeriia Shilov, Yuri Tomilovskaya, Elena Front Neural Circuits Neural Circuits The aim of this work was to study the sensitivity of the visual system in 5-day “dry” immersion with a course of high-frequency electromyostimulation (HFEMS) and without it. “Dry” immersion (DI) is one of the most effective models of microgravity. DI reproduces three basic effects of weightlessness: physical inactivity, support withdrawal and elimination of the vertical vascular gradient. The “dry” immersion included in the use of special waterproof and highly elastic fabric on of immersion in a liquid similar in density to the tissues of the human body. The sensitivity of the visual system was assessed by measuring contrast sensitivity and magnitude of the Müller-Lyer illusion. The visual contrast sensitivity was measured in the spatial frequency range from 0.4 to 10.0 cycles/degree. The strength of visual illusion was assessed by means of motor response using “tracking.” Measurements were carried out before the start of immersion, on the 1st, 3rd, 5th days of DI, and after its completion. Under conditions of “dry” immersion without HFEMS, upon the transition from gravity to microgravity conditions (BG and DI1) we observed significant differences in contrast sensitivity in the low spatial frequency range, whereas in the experiment with HFEMS—in the medium spatial frequency range. In the experiment without HFEMS, the Müller-Lyer illusion in microgravity conditions was absent, while in the experiment using HFEMS it was significantly above zero at all stages. Thus, we obtained only limited evidence in favor of the hypothesis of a possible compensating effect of HFEMS on changes in visual sensitivity upon the transition from gravity to microgravity conditions and vice versa. The study is a pilot and requires further research on the effect of HFEMS on visual sensitivity. Frontiers Media S.A. 2021-12-24 /pmc/articles/PMC8740068/ /pubmed/35002633 http://dx.doi.org/10.3389/fncir.2021.702792 Text en Copyright © 2021 Shoshina, Zelenskaya, Karpinskaia, Shilov and Tomilovskaya. https://creativecommons.org/licenses/by/4.0/This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
spellingShingle Neural Circuits
Shoshina, Irina
Zelenskaya, Inna
Karpinskaia, Valeriia
Shilov, Yuri
Tomilovskaya, Elena
Sensitivity of Visual System in 5-Day “Dry” Immersion With High-Frequency Electromyostimulation
title Sensitivity of Visual System in 5-Day “Dry” Immersion With High-Frequency Electromyostimulation
title_full Sensitivity of Visual System in 5-Day “Dry” Immersion With High-Frequency Electromyostimulation
title_fullStr Sensitivity of Visual System in 5-Day “Dry” Immersion With High-Frequency Electromyostimulation
title_full_unstemmed Sensitivity of Visual System in 5-Day “Dry” Immersion With High-Frequency Electromyostimulation
title_short Sensitivity of Visual System in 5-Day “Dry” Immersion With High-Frequency Electromyostimulation
title_sort sensitivity of visual system in 5-day “dry” immersion with high-frequency electromyostimulation
topic Neural Circuits
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8740068/
https://www.ncbi.nlm.nih.gov/pubmed/35002633
http://dx.doi.org/10.3389/fncir.2021.702792
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