RELATION BETWEEN VO2max AND SOME BIOCHEMICAL PARAMETERS DURING THE TRAINING PROCESS OF PREFESSIONAL SOCCER PLAYERS

APPLIED EXERCISE PHYSIOLOGY

RELATION BETWEEN VO2max AND SOME BIOCHEMICAL PARAMETERS DURING  THE TRAINING PROCESS OF PREFESSIONAL SOCCER PLAYERS

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

INTRODUCTION. The football game is a type of high intensity, intermittent type of physical loading by activating all metabolic ways of energy production. The supercompensation of the organ systems is a desired aim, including of the increasing of VO2max. On the other side, some biochemical parameters, as creatine kinase (CK), free radicals (FR) and potassium ions (K+ ), are mentioned in the literature as the indicators of adaptation or disadaptation of the training process in soccer.
The aim of this study is to evaluate the relation between VO2max (dependent variable) and some biochemical parameters (independent variables) in process of evaluation of the effects of training process of professional soccer players.
MATERIALS AND METHODS. This study included 30 professional football players from one of the teams of the first football league. The investigations were 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: indirect VO2 max (ml/kg/min) during a maximal treadmill test; 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. There were the significant changes of VO2max during the training process of soccer players, an increasing after the preparation phase and a decreasing at the end of the phase of competition. At the same time, there were the significant changes of biochemical parameters: an increasing of plasma concentration of FR and K+ on the one side, and a decreasing of plasma concentration of CK, on the other side, at the end of phase of competition. Only the decreasing of the CK plasma response after the maximal treadmill test, after the preparation phase, showed a significant negative influence on VO2max.
CONCLUSIONS. The increase of VO2max after the phase of preparation, as a positive effect of training process, was connected with a decrease of CK plasma response on maximal treadmill test, maybe as a result of an adaptation of muscle cell membrane on increased volume of training in the phase of preparation. Taking account the decrease of VO2max at the and of phase of competition, together with the decrease of plasma CK and CK plasma response on maximal treadmill test, on the one side, and increase of plasma FR and K+ and their responses, on other side, it was indicated that there were some signs of fatigue and disadaptation at the end of the phase of competition.
KEI WORDS: soccer, VO2max, creatine kinase, free radicals, potassium.