UDC

616.127:612.084

DOI

10.37482/2687-1491-Z073

Authors

Lev I. Irzhak* ORCID: https://orcid.org/0000-0003-3459-7848
Nadezhda G. Russkikh* ORCID: https://orcid.org/0000-0003-4413-8258
Aleksandra N. Parshukova* ORCID: https://orcid.org/0000-0001-7297-3395

*Syktyvkar State University named after Pitirim Sorokin (Syktyvkar, Komi Republic, Russian Federation)

Abstract

The purpose of this article was to determine the effect of the clinostatic test on the electrical properties of the myocardium in older adults leading an active lifestyle. Materials and methods. The study involved 38 people aged between 70 and 90 years living in a northern city (Syktyvkar, 61°N) and leading an active lifestyle. The indicators of the electrical properties of the cardiac muscle were determined before and after the clinostatic test. For this purpose, an ECG was recorded in the standard lead II in the standing and lying positions. Results. Using the method of paired comparisons, we showed a decrease in heart rate under the influence of the clinostatic test from 76 ± 10 beats/min to 64 ± 10 beats/min. The variability of ECG components according to pNN50 (the percentage of successive NN intervals differing from each other by more than 50 ms) in older adults in the standing position was, on average, two times lower than in the lying position. The PP interval increased from 0.81 ± 0.12 s (in the standing position) to 0.90 ± 0.10 s (in the lying position). The PT interval remained practically unchanged, staying at the level of (0.46 ± 0.07) – (0.49 ± 0.07) s. The TP segment grew from 0.35 to 0.42 ± 0.10 s. The RD amplitude was 1.04 ± 0.43 mV in the standing and 0.88 ± 0.30 mV in the lying position; the propagation rate of depolarization in the cardiac muscle was 245 ± 137 and 205 ± 106 mm/s, respectively. In addition, the paper discussed the mechanism of opposite reactions to the clinostatic test, i.e. increasing duration of cardiointervals and decreasing amplitude indicators.

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Corresponding author: Lev Irzhak, address: prosp. Oktyabr’skiy 55, Syktyvkar, 167000, Respublika Komi, Russian Federation; e-mail: irzhak31@mail.ru
For citation: Irzhak L.I., Russkikh N.G., Parshukova A.N. Variability of Time and Amplitude ECG Indicators in Older Adults. Journal of Medical and Biological Research, 2021, vol. 9, no. 4, pp. 355–365. DOI: 10.37482/2687-1491-Z073

Keywords

electrocardiogram, older adults, cardiointervals, cardioamplitudes, clinostatic test, electrical properties of the myocardium

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