HILDEBRANDT INDEX AS A PROGNOSTIC CRITERION OF ABANDONMENT OF AN INTENSE PHYSICAL ACTIVITY

The aim is to research human cardio respiratory system at the time of abandonment of intense physical activity based on Hildebrandt index. Materials and methods: The research involved 16 male volunteers practicing regular physical exercises. Exploration of physical status of test subjects occurred at rest and during exercise testing on a bicycle ergometer. Exercise testing made test subjects experience the step-dosed physical activity with intensity growing up to capacity. The power of the first phase of exercise was 60 W, and the power of subsequent exercise phases successively increased in increments of 20 W up to the test subject’s capacity. The duration of each exercise phase was 2 minutes. We recorded ECG and pneumogram, measured blood pressure and pedaling speed. Assessment of hemodynamic parameters, Hildebrandt index and the “physiological value” of the work accomplished occurred through calculation. Results. The research revealed that Hildebrandt index was practically independent from angular pedaling speed during low intense exercise, which demonstrates stable status of the test subjects’ cardiorespiratory system. Abandonment of exercise resulted in significant increase of cardiac output, “physiological value” of the work accomplished, and Hildebrandt index while angular pedaling speed, on the contrary, had a tendency to decrease. Regression analysis revealed that increase of angular pedaling speed caused decrease of respiratory rate while Hildebrandt index, on the contrary, was growing. These points illustrate violation of intersystem relations of motor and cardiorespiratory systems at the time of abandonment of exercise. Conclusion. Increasing Hildebrandt index on the background of decreasing respiratory rate is a prognostic sign of abandonment of an intense physical activity. The data obtained can become the basis for the diagnosis of “abandonment” of cyclists.

1. Popov К.S., Burlutskaia А.V., Bikusheva R.N. et al. Association of autonomic parameters and the level of asthma control of children. Meditsinskii almanakh [Medical almanac], 2018, no. 3(54), pp. 60-64. (in Russ.)
2. Big Medical Encyclopedia. Ed. by B.V. Petrovskii. Third edition, online version, https://бмэ.орг/index.php (in Russ.)
3. Fudin N.A., Sudakov K.V., Khadartsev A.A. et al. Hildebrandt index as an integral indicator of the physiological value of athletes in the process of increasing step-dosed physical activity. Vestnik novykh meditsinskikh tekhnologii [Bulletin of new medical technologies], 2011, Vol. XVIII, no. 3, pp. 244-248. (in Russ.)
4. Karpman V.L., Belotserkovskii Z.B., Gudkov I.A. et al. Cardiohemodynamics and physical performance of athletes. Мoscow, Sovetskii sport Publ., 2012, 189 p.
5. Klassina S.Ia. Physiological model of coach-athlete social interaction during training on a veloergometer. Vestnik novykh meditsinskikh tekhnologii [Bulletin of new medical technologies], 2014, vol. 21, no. 3, pp. 122-126. (in Russ.)
6. Doeltgen S.H, Ridding M.C. Behavioural exposure and sleep do not modify corticospinal and intracortical excitability in the human motor system. Clin Neurophysiol, 2010, no. 121, pp. 448–452.
7. Kérdö I. Ein aus Daten der Blutzirkulation kalkulierter Index zur Beurteilung der vegetativen Tonuslage. Acta neurovegetativa, 1966, Bd. 29, no. 2, pp. 250-268. (in German).
8. Powers S.K, Williams J. Exercise-Induced Hypoxaemia in Highly Trained Athletes. Sports Medicine, Springer, 1987, Vol. 4, Issue 1, pp. 46–53.
9. Sharma P., Vyacheslav M., Carissa C., Vanessa R., Bodo M. Pyruvate dose response studies targeting the vital signs following hemorrhagic shock. J. Emerg Trauma Shock, 2015 Jul-Sep; no. 8(3) p. 1.
10. Webb W.R, Moulder P.V, Harrison L.H, Broussard M.L. Simple method for evaluating cardiac output. J La State Med Soc. 2009 Sep-Oct; no. 161(5), pp. 287-89.