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"Medicina Sportiva" No.14 - 2008 The 15-th Sports Medicine Balkan Congress
APPLIED EXERCISE PHYSIOLOGY


THE  CHANGES  OF  BLOOD LACTATES, IN CORRELATIONS WITH SOME BIOCHEMICAL PARAMETERS, DURING THE TRAINING PROCESS OF PROFESSIONAL SOCCER PLAYERS

Handziska Eli, Dalip Metin,  Handziski Zoran,   Nikolik Slobodan
Institute of Physiology, Medical Faculty, Skopje; Center of Sports Medicine and Exercise Science „Kineticus", Republic of Macedonia.

INTRODUCTION. Although the blood lactates and anaerobic threshold (AnT) are the well established  parameters in following up the training process of professional soccer players, some other biochemical parameters, as creatine kinase (CK), free radicals (FR) and potassium (K+) are interested in monitoring the volume and intensity of soccer training process. Some other data suggest that CK could be a better indicator of training adaptation than LDH and blood lactates.
The aim of this study is to evaluate the changes of blood lactates, in correlations with some biochemical parameters, during a soccer competition half- season.
MATERIAL AND METHODS. This study included 30 professional football players from one of the teams of the first football league. The investigations are made at three points: in the beginning of the preparation period, after the preparation period, and after competition period. Each of the investigations was performed in three phases. The following parameters had been determined: AnT (km/h and beat/min) with Conconi method; blood lactates during maximal treadmill test and during high intensity soccer training, divided in 6 series (4 minutes exercise with 2 minutes rest) of high intensity aerobic-anaerobic training; before and after maximal treadmill test, plasma concentrations of  CK, FR and K+ by DEROM method; responses of plasma concentrations of CK, FR and K+ as differences of their concentration before and after maximal treadmill test.
RESULTS. Although there were no significant differences in blood lactates during the maximal treadmill test between three phases of training process, the blood lactates on the level of reached AnT significantly decreased after the phase of preparation, increased on the maximal level and decreased after the stage of recovery at the end of phase of competition. There were the significant increases in blood lactates after the 6th series and phase of recovery of high intensity soccer training at the end of phase of competition. The AnT changed insignificantly during the training process. There were significant correlations between blood lactates and biochemical parameters, especially with K+ at the end of phase of competition.
CONCLUSIONS. All results suggest that after the started adaptation on increased volume of training, after the phase of preparation, there are signs of depletion of glucostatic regulation, connected with fatigue and disadaptition at the end of competition season. Accordingly with no increased of AnT, the necessity of changes of training process of this soccer club is obvious.
KEY WORDS: soccer, blood lactates, creatine kinase, free radicals, potassium.






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