PubMed Health⌕ Search

Biomedical subjects

N I Moiseeva

Publications and source records attributed to N I Moiseeva.

At least 19 recordsLinked to original sources
PubMed1995

[Decreased oxygen content in the atmosphere--an ecological disaster imperceptibly sneaking up?].

With the use of gas chromatography there have been done 112 analyses of an oxygen content in the air of St. Petersburg. The results were computer-processed with an application of the standard programs of statistical analysis and program of analysis of the extreme values which permitted to provide the stability of the studied process. In an autumn-winter period (November-January) the values of oxygen content in the air in 37 measurements have been different from the norm in that they declined more than 0.5% and in 12 measurements-approximately by 1%. The mean values of December and January differed from the norm by 0.652; 0.639; 0.834%, respectively. In February, the mentioned changes were smoothed over. As a result of a decrease of oxygen in the period when the green plants stop air purification, the air composition ceases to content, which is the indication of a partial disorder of regulating activity of the biota.

Atmosphere↗
PubMed1990

[The effect of the motor regimen on the state of the blood circulation in 6-year-old children in kindergarten].

Six-year old children attending day-care centers' groups with different motor regimens (a regular group and experimental classes where children spend 2.5-3.5 hours a day at the desk) were examined at the beginning (September) and at the end (May) of a school year for the following parameters: arterial blood pressure, pulse and breathing rate, as well as a step of regulation of the cardiac rhythm and spontaneous motor activity (determined with the help of coherent optics equipment according to ECG and actogram recordings). It has been found out that children from the experimental class have the bloodcirculation regulation status which is worse than that in children following a regular regimen. The authors suppose that it might be due to the reduction of physical activity.

Child↗
PubMed1986

Slow-wave oscillations of the multi-unit activity average frequency in the human brain during drowsiness and sleep.

Slow-wave oscillations of the mean frequency of multi-unit activity (MUA) were studied in the cerebral subcortical structures of parkinsonic and epileptic patients treated with the aid of implanted electrodes, during sleep, drowsiness and awakening. During slow-wave sleep, the MUA slow-wave oscillations become augmented, the number of oscillatory components increases as well as the amount of oscillations with identical or similar periods in different structures. During paradoxical sleep, the total amount of oscillatory components decreases. The MUA rhythmic activity is quite obvious in awakening from sleep, the short-period components prevailing. The data obtained reveal high incidence of the rhythms with periods of about 20 sec which is considered from the standpoint of the hypothetical adaptogenic rhythm in the CNS developing at the moments of certain efforts and adaptive activity of the organism.

Cerebral Cortex↗
PubMed1979

The significance of different sleep stages for the regulation of electrical brain activity in man.

In 9 patients with implanted electrodes, the relationships between 13 deep subcortical structures and the premotor cortex were considered during different sleep stages, using both neuronal activities and slow electrical processes (including scalp EEG). Changes occurred asynchronously with a relative independence between the various brain structures during slow sleep. On the other hand, during REM sleep, all parameters reveal a high degree of synchronization of the activities. It is suggested that during slow wave sleep each of the separate rhythms display their own regulation, while in paradoxical sleep, it is their inter-relationships which are mainly controlled. The REM stage probably has some other function, associated with the fact that a neuronal population which has taken no part in any activity during wakefulness now reacts.

Action Potentials↗
PubMed1978

[Biorhythm structure as one of the criteria of the body's capacity for physiologic adaptation].

In order to establish the criteria of the organism's ability for adaptation, we examined 16 healthy subjects, 10 of whom were able to very well adapt themselves to changes in environment, whereas 6 subjects could not do that well enough. In the background examinations (and for the well-adapting subjects in examinations made after meridian crossing in flight), the blood pressure, heart rate, and capillaroscopic picture were recorded during 3 days 5 times a day. Apart from that, the biorhythmic structure of the natural nocturnal sleep EEG was analysed. The data obtained showed that the well-adapting subjects had these characteristics of the biorhythms structure: relatively higher mean values of the parameters under study, a major dispersion of these values over different hours of the day and night, and clear temporal structure of the 24-hr curve as expressed by occurrence of the maximal and the minimal values of the functions at the same hours.

Adaptation, Physiological↗
PubMed1976

Activity of neuronal populations of human subcortical structures during sleep.

Multi-unit activity of 14 subcortical structures was studied during drowsiness and sleep in patients with depth electrodes implanted in the brain for therapeutic purposes. The mean firing rate of the multi-unit activity was found to decrease during "slow-wave" sleep in each cycle. The multi-unit activity was sharply increased during paradoxical sleep. In successive sleep cycles the mean firing rate somewhat increased from cycle to cycle during slow sleep. The mean firing rate was considerably increased during wakefulness after a sufficiently logn sleep, as compared with the initial background values. Fluctuations of the mean firing rate were characteristic of paradoxical sleep. When studying simultaneously 2 or 3 structures, both uniform or different changes of the neuronal activity were possible. Changes of the firing rate in separate structures may develop a few seconds prior to the "clinical display" of the REM phase. All (or nearly all) the structures, whose activity during sleep is rather independent, are presumed to be able to be a source of the REM phase.

Brain↗
PubMed1975

The characteristics of EEG activity and the subjective estimation of time during dreams of different structure.

During dreams evoked by stimuli of a certain duration, the EEF was studied in healthy subjects and in patients with implanted electrodes (EEG, ESCoG (electrosubcorticogram), unit activity). Estimation of the temporal structure of the dream was made from the verbal account of the subject. In the case of an unformed dream the duration of the dream was shown to be adequately estimated, the EEF and ESCoG patterns to be rather variable, and correlation between the bioelectric activities of different structures to be nearly absent. Apparently, in these cases, only some of the structures participate in the formation of dreams, which accounts for their unstructure, with no disorder of temporal and spatial relationships, is accompanied by certain orderly rhythms, similar EEG and ESCoG patterns, and a high correlation between bioelectric processes occurring in the structures under study. Dreams with a complex structure, with simultaneous action in different aspects and with major overestimation of their duration, are accompanied by polymorphous EEG and ESCoG patterns. Almost no correlation is observed between bioelectric processes in different structures. Apparently these dreams are associated with independent activities in different structures and, in the verbal account, the subject tends to place the events in a certain temporal order which creates the effect of considerable acceleration of the time flow.

Alpha Rhythm↗