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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