Significance of biochemical and hematological indicators of racing skiers during adaptation to training loads

Aim. The aim of this article is to study the dynamics of hematological and biochemical blood indicators in racing skiers at different stages of preparation depending on their qualifications and establish significant indicators for forecasting athletes' performance at future competitions. Materials and methods. We examined male racing skiers aged 21-23 having the rank of the Candidate for Master of Sport (n = 14) and Master of Sport (n = 6). The study was conducted using instrumental methods and the methods of mathematical statistics. Results. We established that the following indicators can be considered as statistically significant in the dynamics from the preparation to competitive stages: low density lipoproteins (р = 0.00); erythrocyte acetylcholinesterase enzyme (р = 0.02); blood coagulation time (р = 0,021); skeletal muscle creatine kinase enzyme (р = 0.00); hematocrit (р = 0.035); triglycerides (р = 0.05). Conclusion. Our study demonstrates that under significant dynamics of the established indicators at the preparation stage racing skiers are able to perform within 67.89 RUS-points at distance sports (80th place of 2000 athletes in the database of the Cross-Country Ski Federation of Russia).