Saratov JOURNAL of Medical and Scientific Research


Synchronization of low-frequency rhythms in electroencephalogram by respiration with linear dependent time frequency.

Year: 2016, volume 12 Issue: №4 Pages: 541-548
Heading: Physiology and Pathophysiology Article type: Original article
Authors: Karavaev A.S., Runnova A.E., Borovkova E.l., Ishbulatov Y.M., Khorev V.S., Kiselev A.R., Zhuravlev M.O., Ponomarenko V.I., Prokhorov M.D., Bezruchko B.P., Koronovsky A.A..
Organization: Saratov Branch of Institute of Radio Engineering and Electronics n.a. V.A. Kotelnikov, Saratov State Medical University, Saratov state university

The aim of the present study was to investigate the features of interaction of low-frequency rhythms in delta band of electroencephalogram (EEG) and processes in vegetative regulation of circulation with respiration. Materials and methods. 19 leads of EEG, photoplethysmogram (PPG) and respiration were simultaneously recorded in four healthy males (19-25 years old) during 30 minutes physiological test with linearly increasing frequency of respiration. Modern methods of nonlinear dynamics were used to diagnose the presence of phase and frequency synchronization between respiration and low-frequency rhythms in delta band of EEG and in PPG. Results. We found significantly long sections of synchronization of delta rhythms in cervical leads of EEG and low-frequency rhythms in PPG by respiration with linearly increasing frequency. Conclusion. Obtained results correlate well with established hypothesis which suggest that low-frequency rhythms in baroreflectory regulation of circulation are in complex dynamic relationships with structures of brain stem. A method was proposed for quantitative evaluation of synchronization strength between respiration and low-frequency rhythms in electrical brain activity in physiological tests with respiration with frequency linearly increasing in time.

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Comparison of key indicators of external respiration function in students of three health groups


Purpose: to define key indicators of function of external breath of students of three groups of health taking into account various total sizes of a body. Material and Methods. For an assessment of breathing function, volume and highspeed characteristics the diagnosing Eton installations (Russia) and Schiller (Switzerland) were used. Results. Age peculiarities of respiratory ventilation disorders and differentiated assessment of circulatory and metabolic parameters according to the total body size in the special health groups (SHG) are analyzed in the article. Breathing volumetric characteristics were examined among the 17-18 aged students in the different health groups. Special attention is paid to the effect of the long-term severe bronchial patency disorders which lead to the respiratory muscles overstrain and the decrease of their strength endurance. This results in the lungs capacity decrease which is typical for the special health groups' students. Conclusion. It is shown that the students of the 1st health group had lower body weight and the same body length in comparison with the 2nd and 3rd groups. This determined unequal role of respiration in providing vital processes in terms of educational activities, especially in case of disorders of musculoskeletal and cardio-respiratory systems.

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