Impairment in diagnostic capabilities of morphological and biochemical blood composition in terms of the well-timed correction for training loads in highly trained athletes can be ascribed to a number of reasons, among them the lack of focused research on the said problem with due regard for specifics of a sport. Analyzed from this standpoint were the findings of biochemical monitoring in highly trained canoeists over a period of three years. Involved in the research were 19 well and highly trained male athletes aged from 21 to 33 years, among them 7 Merited Masters of Sports, 6 Masters of Sports of International Level, 6 Masters of Sports. Multiply registered (up to 25 measurements per athlete) were selected parameters of blood composition: morphological (blood hemoglobin concentration, hematocrit volume), protein (total protein) and biochemical (amount of urea nitrogen, glucose, cortisol, total and free testosterone, alanine aminotransferase, asparagine transferase, total creatinephosphokinase, iron) ones. From amongst 10 parameters of morphological and biochemical blood composition registered in highly trained canoeists amount of urea nitrogen, total protein and creatine phosphokinase (to a smaller degree) only are representative to some part of the delayed post-exercise changes (in addition, it should be noted that total protein has statistically significant positive correlation with hematocrit volume in many samples). The assumption that the rate of post-exercise restoring of biochemical parameters is higher in athletes with the best performance during relevant competition seasons lacks support.
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