Legal and postal addresses of the publisher: office 1410a, 17 Naberezhnaya Severnoy Dviny, Arkhangelsk, 163002, Russian Federation, Northern (Arctic) Federal University named after M.V. Lomonosov

Phone: (818-2) 21-61-21
E-mail: vestnik_med@narfu.ru
http://medbio.narfu.ru/en/

ABOUT JOURNAL

Variability of Electrocardiogram Components in Response to a Mental Test in Men Aged 18– 19 Years. P. 35–40

Версия для печати

Section: Physiology

UDC

612.172.2:612.172.4:612.176

Authors

Nadezhda G. Russkikh*, Lev I. Irzhak*
*Syktyvkar State University named after Pitirim Sorokin (Syktyvkar, Russian Federation)

Abstract

This paper studied electrocardiograms (ECG) of healthy young men aged 18–19 years at rest and during a mental test. The work aimed to examine the duration of the PP, РT, and PQ intervals and the TP segment at rest and in response to a mental test. The research involved 15 first-year students of Syktyvkar State University named after Pitirim Sorokin. Their body length (cm) and weight (kg) were measured and their heart rate was palpated for 60 seconds. Using the VNS-ritm device (Neurosoft, Russia), 50 ECG cardiac cycles were recorded in lead II at rest (seated position) and during the mental test (mental counting from 100 to 1 for one minute). Within one minute, the heart rate increased by an average of 41 %, the РР interval decreased by 30 %, the duration of the РT and PQ intervals remained at the initial level, although the share of the РT interval in the cardiac cycle increased by 33 %. The duration of the TP segment almost halved. Thus, the lowest variability in this experiment was observed in the PT and PQ intervals, while the highest, in the TP segment. It was revealed that the higher the heart rate as a result of the mental test, the bigger the share of the atrioventricular complex (PT) and the smaller the share of the electrical diastole (TP) in the total duration of the PP interval. The degree of the increase in heart rate and shortening of the ECG elements’ duration depends on their values at rest.

Keywords

electrocardiogram, electrocardiogram intervals, heart rate, mental test, heart rate variability, young men aged 18–19 years
Download (pdf, 1.6MB )

References

  1. Agadzhanyan N.A., Baevskiy R.M., Berseneva A.P. Funktsional’nye rezervy organizma i teoriya adaptatsii [Functional Reserves of the Body and the Theory of Adaptation]. Vestnik vosstanovitel’noy meditsiny, 2004, no. 3, pp. 4–11. 
  2. Danilova N.N. Serdechnyy ritm i informatsionnaya nagruzka [Heart Rhythm and Information Load]. Vestnik Moskovskogo universiteta. Ser. 14: Psikhologiya, 1995, no. 4, pp. 14–27. 
  3. Pankova N.B. Funktsional’nye proby dlya otsenki sostoyaniya zdorovykh lyudey po variabel’nosti serdechnogo ritma [Functional Tests for the Assessment of the Healthy People State Using Heart Rate Variability]. Rossiyskiy fiziologicheskiy zhurnal im. I.M. Sechenova, 2013, vol. 99, no. 6, pp. 682–696. 
  4. Sidorenko G.I., Frolov A.V., Vorob’ev A.P. Psikhoemotsional’nye testy i perspektivy ikh primeneniya v kardiologii [Psychoemotional Tests and Prospects of Their Use in Cardiology]. Kardiologiya, 2004, no. 6, pp. 59–64. 
  5. Kuznetsova O.B. Variabel’nost’ ritma serdtsa v protsesse uchebnoy deyatel’nosti studentov s raznym urovnem fizicheskoy aktivnosti [Heart Rate Variability During Students’ Learning with Various Levels of Physical Activity]. Chelyabinsk, 2007. 21 p. 
  6. Russkikh N.G., Irzhak L.I. Izmenenie pokazateley serdechnogo ritma i kardiointervalov u detey 6-7 let v otvet na aktivnuyu ortostaticheskuyu probu [The Change of Indicators of Heart Rhythm and Cardio Intervals in Children 6–7 Years in Response to the Active Orthostatic Test]. V mire nauchnykh otkrytiy, 2016, no. 3, pp. 127–138. 
  7. Stepanyan A.Yu., Grigoryan V.G., Agababyan A.R., Arakelyan A.N., Arutyunyan N.D. Issledovanie vliyaniya vypolneniya zadach prostranstvenno-obraznogo tipa na variabel’nost’ serdechnogo ritma [Study of the Influence of Performing Spatial and Image Tasks on Heart Rate Variability]. Zhurnal vysshey nervnoy deyatel’nosti im. I.P. Pavlova, 2005, no. 55, pp. 472–477. 
  8. Bashkirov P.N. Uchenie o fizicheskom razvitii cheloveka [The Study of Human Physical Development]. Moscow, 1962. 340 p. 
  9. Khaspekova N.B. Diagnosticheskaya informativnost’ monitorirovaniya variabel’nosti ritma serdtsa [Diagnostic Informative Value of Heart Rate Variability Monitoring]. Vestnik aritmologii, 2003, no. 23, pp. 15–23. 
  10. Irzhak L.I., Dudnikova E.A. Chastota serdechnykh sokrashcheniy i dlitel’nost’ elementov EKG u vzroslogo cheloveka pri fizicheskoy nagruzke [HR and Duration of ECG Elements of an Adult During Physical Exercises]. Rossiyskiy fiziologicheskiy zhurnal im. I.M. Sechenova, 2017, no. 2, pp. 209–216.