Background. The investigation into whether the MCT1 gene in swimming and the inclusion of exercises involving critical velocity in water warm-ups have an effect on performance is ongoing. Objectives. This study aims to examine the relationship between swimming performance and blood lactate level with MCT1 after critical velocity. Methods. 33 girls and 27 boys were included in the study. Intraoral swab and intraoral buccal swap samples were taken from the participants to be used for MCT1 gene analysis by the expert with transport swab, which can be used in DNA analysis. After DNA isolations, MCT1 gene polymorphisms were performed with Real-time PCR. After resting, the resting blood lactate levels (LArest) were taken from the fingertips with Lactate Scout+. Then, the swimmers performed a water warm-up with critical velocity and were taken to the 4 repetitions of the 50-meter (m) individual medley maximal swimming test. Immediately after the test, the blood lactate levels were taken at the 1st (LA1), 6th (LA6), and 15th (LA15) minute rest periods. The swimming test was recorded with a SJCAM camera. The end time was determined with Kinovea 0.9.5. IBM SPSS 24.0 program was used for data analysis. The relationship between blood lactate and swimming performance vs MCT1 dominant genotype and allele distribution was analyzed by Pearson correlation. The significance level was taken as p<0.05. Results. No significant differences between LArest and performance vs MCT1 (p>0.05). A significant correlation was found between LA1, LA6, LA15 values vs MCT1 (p<0.05). Conclusion. In conclusion, this study confirmed that there is a relationship between the MCT1 dominant genotype and blood lactate levels in swimmers, but this relationship with performance has not been confirmed.
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