The aim of the work was to evaluate the behavior of laboratory rats under the influence of negative air ions using various behavioral models. To create an excess of negative air ions, a Hippocrates ionizer (Enterprise Energia, Naberezhnye Chelny, Russia) was used. The exposure was carried out daily for 2 hours for 18-20 days. Wistar rats were used in the work. It was found that according to the open field test, under the influence of negative air ions, the level of indicators reflecting vertical and horizontal motor activity increased; decreased grooming rates and the number of bowel movements; the frequency of examination of holes increased. According to the elevated plus maze test, the number of visits to open and closed arms, hanging from open arms significantly increased with a simultaneous decrease in the frequency and duration of grooming, a decrease in the duration and number of freezes. The index of anxiety in the studies changed insignificantly. On the model of a black-and-white chamber, the time spent by rats in the dark and light compartments varied. The rats of the experimental group spent more time in the open space of the test, there was a significant increase in the exits and the duration of the time of looking out from the dark into the light compartments. In general, according to the behavioral models used, keeping animals in an environment enriched with air ions led to significant changes in the behavior of animals, increasing activity, emotional reactivity and stress resistance.
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