Backgraund. Peripheral blood reticulocytes and aging of the activity of these cells are markers of erythropoiesis
activity. The purpose of this study was to examine changes of reticulocytes in blood formation of elite athletes in
endurance sports during the preparation and the competitive periods.
Methods. Reticulocytes and IRF content was examined in blood of 305 elite athletes aged 20-26 years that
specialized in swimming, biathlon, cross-country skiing, kayaking and canoeing, rowing and cycling. At various
stages of preparation 459 blood tests were performed and processed. Capillary blood was analysed using a
haematology analyser SYSMEX XT 2000i.
Results. Differences in reticulocytes depending on sport, gender and qualification were not found. Increase in
reticulocytes was marked for male athletes in the age aspect, for females, reduction was observed. A tendency of
average reticulocytes group data in peripheral blood at various stages of the annual preparation cycle was found:
reduction of the amount of reticulocytes in competition period. This pattern was found regardless of gender. Similar
evidence was found concerning the dynamics of IRF at the stages of the annual training.
Conclusion. The effect of training activity on reticulocyte indices in the annual training cycle is related to the
direction, duration and intensity of physical activity in different periods of training. Changes in reticulocytic indices
may be due to effects such as hemoconcentration and hemodilution appearing after exercise in the corresponding
areas of energy supply.
The article presents the results of serum enzymes study in endurance sports. 311 elite athletes were investigated in swimming, biathlon, cycling, cross country skiing, rowing and kayaking. Capillary blood examination was performed on training camps during ten years. We included in statistical analysis 6950 CK tests, 5904 - AST and 5667- ALT. They were analyzed depending on kind of sport, training stage preparation and gender. The physiological serum enzyme ranges of elite athletes were estimated in view of sport, gender differences and stage of preparation. Serum enzyme activity trend was found in endurance sports at various preparation stages of the annual cycle of training. The high individual variation of CK activity was in endurance sports (variation coefficient 65,0-102,9% for men and 44,0-128,8% for women). It revealed the significantly higher CK activity in men compared to women. The trend of CK activity decrease was found from preparatory to competitive period. We examined the excess frequency enzyme activity higher upper limit of reference ranges for healthy individuals. It was 29,0% for CK, 23,2% - AST and 9,3% - ALT.
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