EN
After single, maximal physical exercise on ergometer in the investigated sport groups (cyclists-seniors and juniors and weightlifters-seniors) were found: no statistically significant differences in haematocrit count and haemoglobin concentration, increase of leukocytes number in cyclists-seniors (p < 0,001) and weight-lifters-seniors (p < 0,001), statistically significant increase of glucose (p < 0,05), free fatty acids (p < 0,05) and total lipids (p < 0,05) concentrations in cyclists-seniors and a significant decrease of glucose concentration (p < 0,05) in cyclists- juniors, statistically significant increase of lactic acid concentration in cyclists-seniors (p < 0,001) and juniors (p < 0,05) so as in weight-lifters-seniors (p < 0,001), statistically significant increase of pyruvate in cyclists-seniors (p < 0,001) and weight-lifters-seniors (p < 0,05), statistically significant increase of citric acid (p < 0,05) in cyclists-juniors, statistically significant decrtease of T4 in cyclists-seniors (p < 0,05) and slight decrease of T4 in weight-lifters-seniors. In both groups after an exercise occured also a slight decrease of T3 concentration, no significant correlations between hormons of thyroid gland and lactate, pyrurate and citrate, in weight-lifters seniors a correlation between after- -exercise values of T4 and FFA (r = 0,670) and between T3 and FFA (r = 0,730), - befor an exercise occured such correlations: in cyclists- -seniors between rT3 and citrate (r = 0,836) in cyclists- -juniors between T4 and citrate (r = 0,773) and between T3 and citrate (r = 0,638), in weight-lifters seniors between T4 and lactate (r = 0,736) and between rT3 and pyruvate (r = -0,762).