Background and Aim: Lactate tolerance is one of the important points for all of the athletes, especially those in need of high anaerobic capacity. Therefore, the effect of different training practices on lactate tolerance is important for athletic instructors. The aim of this study was to investigate and compare the maximal level of lactic acid in exhaustive protocols in active young men in the University of Mohaghegh Ardabili.

Material and Method: In this semi-experimental study, 24 active students with an average age of 23.2 ± 0.56 years, mean weight of 65 ± 3.4 kg and body mass index of 22 ± 2.2 kg / m2 were selected. They were randomly divided into four groups and in each group 30, 60, 90, 120 seconds’ exhausted protocol were performed. Blood lactate was measured by taking blood from the fingertips of the participants to estimate the maximum lactic acid level in the protocols at the end of each test. Data were analyzed by using one-way Analysis of Variance (ANOVA) and Bonferroni post hoc test.

Results: The results showed that there was a significant difference between the maximum level of lactic acid obtained from 30, 60, 90 and 120 seconds exhausting protocols (p <0.05). Also, the results of Bonferroni post hoc test showed that there was a significant difference between the lactic acid obtained from the 30 seconds protocol with the 60 seconds protocol, the maximum lactic acid level in 30 seconds with 90 seconds and the maximum level of lactic acid of the protocol for 30 seconds with 120 seconds (p ≤0.05). In consequence, the results of the Bonferroni test showed no significant difference between the lactic acid obtained from 60, 90 and 120 seconds protocols (p <0.05).

Conclusion: The results of this study showed that with the decreasing steps of the exhausting protocols, the maximum lactic acid level is increased. Therefore, it can be concluded that using these protocols to estimate physiological indices should be questioned.