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To investigate the levels of MMP9 and TIMP1 before and after acute maximal exercise and the role of MMP9 -1562 C/T and TIMP1 372 T/C polymorphisms in athletes and sedentary individuals. The athlete group (n = 43) and sedentary group (n = 43) performed the Yo-Yo intermittent recovery test level 1. A blood sample was taken before and after the test. MMP9, TIMP1, MMP9/TIMP1 ratio, blood lipids, and lipoproteins (total cholesterol, high and low-density lipoprotein cholesterol) and indicators of muscle damage (creatine kinase, aspartate aminotransferase, alanine aminotransferase) were determined from postprandial venous blood samples. Genetic polymorphisms were determined from DNA samples obtained from peripheral blood. MMP9 levels were found higher in both groups after the YOYO IR-1 test (exercise) (sedentary group, pre-exercise: 1771.15 ± 862.17 pg/mL, post-exercise: 2172.18 ± 680.93 pg/mL; athletic group, pre-exercise: 1373.57 ± 705.16 pg/mL, post-exercise: 1723.72 ± 733.88 pg/mL, p < 0.05). TIMP1 levels were also found higher in both groups after exercise (sedentary group, pre-exercise: 4.63 ± 3.99 ng/mL, post-exercise: 5.3 ± 3.51 ng/mL; athletic group, pre-exercise: 3.26 ± 2.34 ng/mL, post-exercise: 3.59 ± 1.99 ng/mL, p < 0.05). Basal serum MMP9 levels were significantly higher in sedentary individuals as compared with athletes (p = 0.046). MMP9 -1562 C/T and TIMP1 372 T/C polymorphisms had no effect on MMP9 and TIMP1 levels (p > 0.05). As a conclusion acute exercise increases MMP9 and TIMP1 levels in male athletes and sedentary individuals. Chronic anaerobic exercises performed by the athletic group may caused lower MMP9 levels. MMP9 -1562 C/T and TIMP1 372 T/C genetic polymorphisms are not associated with MMP9 and TIMP1 activation.

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