N.V. RYLOVA¹, A.V. ZHOLINSKY², A.A. BIKTIMIROVA¹

 ¹ Kazan State Medical University, Kazan

² Federal Scientific and Clinical Center for Sports Medicine and Rehabilitation of the FMBA of Russia, Moscow

Contact details:

Rylova N.V. — MD, Professor of the Department of Hospital Pediartics

Address: 49 Butlerov St., Russian Federation, Kazan, 420012, tel.: +7 (917) 397-33-93, e-mail: rilovanv@mail.ru

Based on the currently available scientific literature, the indicators of cellular energy status, in particular the elevated levels of carnitine in muscle tissue, may be associated with the neuromuscular fatigue.

The purpose is to study the relationship between cellular energy exchange and endurance of young athletes.

Material and methods. The study included children aged 12 to 18 years. The main research group (94 young athletes) consisted of two subgroups depending on the nature of the training load — cyclic (46) and game (48) sports. The control group was 37 children engaged in physical training only at school. Special research methods were: tandem chromatography-mass spectrometry and cardiorespiratory stress testing.

Results. The indicators of free carnitine in young athletes, depending on the type of sports load, have significant differences. Using the Tukey criterion revealed that the content of free carnitine is significantly higher in athletes with cyclic loads than in athletes of game type sports and the control group. Differences in absolute and relative maximum oxygen consumption (MIC) in the study groups were significant. Evaluation of the absolute MIC found that boys — athletes of cyclic sports, show a higher level of MIC than athletes of game types and control groups. Relative indicators of the MIC indicate similar trends.

Conclusion. It was found that the indicators of cellular energy and MIC are significantly higher among young athletes of cyclic sports in comparison with game sports. With a comprehensive study of the energy status of young athletes, it is possible to predict the level of physical performance. The contribution of the level of free carnitine to the variance of the absolute MIC index is 20,9% (p < 0,01).

Key words: young athletes, carnitine metabolism, physical performance.

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