Changes in cortisol levels in young athletes during the process of adaptation to physical exercise

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Dr. Biol., Professor M.V. Shayhelislamova1
PhD, Associate Professor N.B. Dikopolskaya1
PhD, Associate Professor A.A. Sitdikova1
PhD, Associate Professor G.A. Bilalova1
1Kazan (Volga region) Federal University, Kazan

Objective of the study is to investigate cortisol excretion levels in boys aged 11-15 years under conditions of increased physical activity.
Methods and structure of the study. The study involved hockey players aged 11-15 years and boys from a control class who were engaged in physical training as part of the general school curriculum. The excretion of urinary bound (B) and free (F) cortisol was studied. The B content was determined by chemiluminescent immunoassay on microparticles using the ARCHITECT i optical system (manufactured in the USA). The determination of F was carried out using an immunoenzymatic colorimetric method with a laboratory device – URINARY ‘FREE’ CORTISOL ELISA (EIA-2989), (manufactured in Germany). A functional test in the form of a dosed bicycle ergometer load was used.
Results and conclusions. Increased physical activity is a dominant factor in the development of glucocorticoid function in the adrenal cortex of boys aged 11–15. High F and B levels in young hockey players, exceeding the values of boys in the control group, indicate the stressful effect of physical activity, especially in the early stages of training. A decrease in F at the age of 15 against a background of stable B values, manifested in a state of relative rest and after dosed physical activity, may indicate the formation of a glucocorticoid reserve during training and an increase in the body's resistance to increased physical activity with age.

Keywords: free and bound cortisol, boys aged 11–15, hockey training.

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