Makarova G.A.
Kuban State University of Physical Culture, Sports and Tourism, Krasnodar

Pogrebnoy A.I.
Kuban State University of Physical Culture, Sports and Tourism, Krasnodar

Chernukha S.M.
Kuban State University of Physical Culture, Sports and Tourism, Krasnodar

Karpov A.A.
Kuban State University of Physical Culture, Sports and Tourism, Krasnodar

Objective of the study aims to find out how important low blood sugar (hypoglycemia) is as a risk factor for physical deterioration in professional kayakers and canoe rowers.
Methods and structure of the study. The aim of the study was to substantiate the importance of maintaining a stable carbohydrate level in the body of athletes during intense physical exertion, based on the analysis of literature data. For this purpose, venous blood glucose levels were monitored by highly qualified rowers in kayaks and canoes. 40 hours after the last training session, 73 male rowers (aged 18-37 years) with sports titles were examined: Honored Master of Sports (MMS), Master of Sports of International class (MSMC) and Master of Sports (MS). 35 athletes were re-examined. Venous blood samples were analyzed at the Consulting and diagnostic center of the S.V. Ochapovsky Research Institute No. 1 (Krasnodar). A total of 166 glucose measurements were performed.
Results and conclusions. The centile gradations of the hematocrit index were determined and significant differences in glucose levels corresponding to hematocrit above and below 75 percent were established. A study of venous blood glucose levels 40 hours after the last workout showed that its maximum values (95%) are below the limits recommended by the World Health Organization for healthy people (5.5 mmol/L). At the same time, in 28.4% of cases, the glucose level was below 4.1 mmol/l, of which 52.0% of cases had values less than 3.9 mmol/L. In the context of sports medicine, the introduction of the term "potential hypoglycemia" is justified, which can act as one of the personal risk factors not only for a decrease in the effectiveness of training, but also for the occurrence of various clinical manifestations of non-functional overstrain, including risks to the cardiovascular system. To prevent the syndrome of potential hypoglycemia in athletes, it is necessary to include the determination of blood glucose levels in the list of parameters recorded during the medical and biological control.

Keywords: highly skilled rowers, kayaks, canoes, glucose concentration, hematocrit index, centile gradations, risk factor.

References

1. Alaverdyan A.M., Alperovich B.R., Gorodetsky V.V., et al. Fizicheskoe perenapryazhenie u sportsmenov: Metod, rekomend [Physical overstrain in athletes: Method, recommendations]. Moscow, 1987. 41 p.
2. Volkov N.I., Nesen E.N., Osipenko A.A., Korsun S.N. Biohimiya myshechnoj deyatelnosti [Biochemistry of muscle activity]. Kyiv: Olympic Literature, 2000. – 503 p.
3. Diagnostika i korrekciya perenapryazheniya centralnoj nervnoj sistemy u sportsmenov ciklicheskih vidov sporta (Metod. rekomendacii dlya vrachej sbor. komand SSSR) [Diagnostics and correction of central nervous system overstrain in athletes of cyclic sports (Method, recommendations for doctors of the USSR national teams)] USSR Ministry of Health, Chief Directorate of Medical and Preventive Care, et al. Moscow, 1986. 25 p.
4. Klinicheskie rekomendacii Rossijskoj associacii endokrinologov. Nediabeticheskie gipoglikemii. 2022 g. [Clinical recommendations of the Russian Association of Endocrinologists. Non-diabetic hypoglycemia. 2022]. URL: https://library.mededtech.ru/rest/documents/nediabeticheskie_gipogl04.09...
5. Makarova G.A., Kolesnikova N.V., Skibitsky V.V., Baranovskaya I.B. Diagnosticheskij potencial kartiny krovi u sportsmenov [Diagnostic potential of blood picture in athletes]. M.: Sport, 2020. 256 p.
6. Rutyakina L.A., Berezovskaya G.A. Gipoglikemii v patogeneze serdechno-sosudistogo riska [Hypoglycemia in the pathogenesis of cardiovascular risk]. 2013. No. 6. Pp. 15-21. URL: https://pharmateca.ru/ru/archive/article/11646.
7. Faktory, vliyayushchie na rezultaty analizov [Factors influencing test results]. URL: https://newlab-med.ru/novosti/31686
8. Amawi, A., W. AlKasasbeh, M. Jaradat, et. al. // Athletes’ nutritional demands: a narrative review of nutritional requirements / Frontiers in nutrition. 2024. Vol. 10. Art. 1331854.
9. DeRosa, M.A., P.E. Cryer Hypoglycemia and the sympathoadrenal system: neurogenic symptoms are largely the result of sympathetic neural, rather than adrenomedullary, activation / American Journal of Physiology-Endocrinology and Metabolism. 2004. Vol. 287(1). P. E32-E41.
10. Dvořáková, K. A literature review of biomarkers used for diagnosis of relative energy deficiency in sport / K. Dvořáková, A.C. Paludo, A. Wagner, et. al. // Frontiers in Sports and Active Living. 2024. Vol. 6. Art. 1375740.
11. Jensen, J., P.I. Rustad, A.J. Kolnes, Y.C. Lai The role of skeletal muscle glycogen breakdown for regulation of insulin sensitivity by exercise / Frontiers in physiology. 2011. Vol. 2. Art. 112.
12. Mountjoy, M., K.E. Ackerman, D.M. Bailey, et. al. 2023 International Olympic Committee's (IOC) consensus statement on Relative Energy Deficiency in Sport (REDs) // British Journal of Sports Medicine. 2023. Vol. 57(17). P. 1073-1097.
13. Petibois, C. Biochemical Aspects of Overtraining in Endurance Sports / C. Petibois, G. Cazorla, J-R. Poortmans, G. Déléris // SportsMed. 2002. № 32 (13). P. 867-878.
14. Physiological Tests for Elite Athletes / R.K. Tanner, C. J. Gore (Eds); Australian Institute of Sport. – 2nd ed. – Champaign, Ill: Human Kinetics. 2013. 560 p.
15. Rana, O. Acute hypoglycemia decreases myocardial blood flow reserve in patients with type 1 diabetes mellitus and in healthy humans / O. Rana, C.D. Byrne, D. Kerr, et. al.// Circulation. 2011. Vol. 124(14). P.1548-1556.
16. Shirley, M., D. Longman, K. Life history perspective on athletes with low energy availability Elliott-Sale // Sports Med. 2022. № 52. рр. 1223-1234.
17. Towler, D.A., C.E. Havlin, S. Craft, P. Cryer Mechanism of awareness of hypoglycemia. Perception of neurogenic (predominantly cholinergic) rather than neuroglycopenic symptoms / Diabetes. 1993. Vol. 42(12). P. 1791-1798.