V.I. Zhulev1, M.B. Kaplan2

1,2 Ryazan State Radio Engineering University named after V.F. Utkina (Ryazan, Russia)

The effectiveness of physiotherapeutic methods can be increased by promptly correcting the parameters of the therapeutic effect based on data obtained from the functional systems of the body. In magnetic therapy, data on the work of the cardiovascular and respiratory systems are most often used.

The paper proposes an approach for measuring the parameters of respiration under conditions of magnetotherapy. The solution is to detect the movement of the chest caused by the patient's breathing activity by using an artificial magnetic field source and continuously measuring this field using a magnetic field sensor attached to the surface of the patient's chest, and then calculating the difference between the base value of the magnetic field recorded by the sensor at holding the patient's breath, and the value of the magnetic field measured by the sensor when the patient breathes. The application of the method assumes that all the characteristics of the artificial magnetic field used are known, and the patient is at rest, when the movement of the chest is due only to the patient's respiratory activity. To obtain the maximum difference between the values of the magnetic field measured during breath holding and in the process of respiratory activity, the sensor should be mounted at the point on the surface of the chest that makes the most amplitude movements during breathing. It is recommended to place the magnetic field source on the line of motion of the magnetic field sensor so that the sensor moves perpendicular to the equipotential surfaces of the magnetic field. However, the deviation from the perpendicular movement, although it will reduce the amplitude of the calculated dependence, will not affect the accuracy of the calculation of the respiratory rate, as well as the possibility of calculating the relative change in the depth of breathing. The most preferred recorded parameter of the magnetic field is the modulus of the magnetic induction vector. In addition to a constant field source, an alternating magnetic field source can be used. However, the use of an alternating magnetic field requires the use, instead of the base value, of the base dependence of the change in the magnetic field, recorded when holding the breath for a time interval that is a multiple of the period of the change in the magnetic field.

The practical implementation of the measurement of breathing parameters is focused on the introduction into the magnetotherapy complex of the "Multimag" series. The presence of a microcontroller control unit in a magnetotherapeutic apparatus provides a potential possibility of synchronizing the processes of generation and measurement of a magnetic field in the case of using alternating magnetic fields.

Zhulev V.I., Kaplan M.B. The use of a magnetic field sensor to determine the parameters of respiration in magnetic therapy conditions. Biomedicine Radioengineering. 2023. V. 26. № 3. Р. 24-28. DOI: https://doi.org/10.18127/j15604136-202303-03 (In Russian)

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