The aim of this study was to investigate the effects of sodium bicarbonate intake on the lactic acid, heart rate and aerobic performance in elite mountain cyclists. Ten cyclists, who were licensed, participated in the study between 20 and 23 years of age. In the study, 0,3 g/kg body weight dosage NaHCO3 substance was given orally by mixing 500 ml fruit juice 2 hours before the test. In order to see the Lactate Acid (LA) levels of the athletes, the ergonomics bicycle ergometer test was applied with the Monark brand 839E model ergometer. According to NaHCO3 intake status, Lactate Measurements, HR, Burnout Time and Distance traveled were recorded. The data obtained from the lactic acid studied in the study were analyzed by repeated measures ANOVA analysis technique in factorial order. In the determination of the difference between the athletes before and after the test, "in-group Paired t test" was applied. The significance level was evaluated according to "0,05" significance level. There was a statistically significant difference between the two groups of LA values before and after receiving NaHCO3 (p < 0,05). However, there was a more significant decrease in LA values after NaHCO3+ administration. Comparing the NaHCO3 uptake status of the LA values before and after taking NaHCO3, no significant difference was found (p > 0,05), immediately after the end of the test and 5 minutes after the end of the test (p < 0,05). In the present study, the comparison of HR, Burnout duration and distance data in NaHCO3 intake status showed that the performance after NaHCO3 was more significant and there was a statistically significant difference between the intake (p < 0,05). In conclusion, in our study, it was tested that lactic acid values of NaHCO3 group in lactic acid values were lower. From this point of view, we can say that the athletes taking NaHCO3 can tolerate lactic acid and perform their performances more.