Athletes with heavy training loads are prone to infectious diseases. It has been shown that these exercises may suppress immune function. The aim of this study was to investigate the effect of one session of intense physical activity with glutamine supplementation on selected factors of wrestlers' immune system. For this purpose, 20 wrestlers were selected and randomly divided into two groups of supplement and placebo. The first blood sample was taken from the subjects. Then they did the Bruce test. Immediately after the end of the test, blood samples were taken from the subjects for the second time and then to the supplement group. The glutamine supplement was given the same amount of maltodextrin per kilogram of body weight and the placebo group. Blood samples were taken from the subjects for the third and fourth time 1 and 2.5 hours after taking the supplement or placebo. After measuring blood factors, the findings were statistically analyzed (ANOVA) at a significance level of p <0.05. The results showed that the percentage of neutrophils in the supplement group increased significantly 2.5 hours after supplementation compared to immediately after exercise and 1 hour after supplementation. This increase was less in the supplement group than in the placebo group. The percentage of lymphocytes in the supplement group decreased significantly 2.5 hours after supplementation compared to the pre-test, immediately after exercise and 1 hour after supplementation, which was less in the supplement group than the placebo group. The percentage of monocytes in the supplement group increased significantly 2.5 hours after supplementation compared to immediately after exercise. This increase was less in the supplement group than in the placebo group. The results of this study showed that glutamine supplementation during strenuous exercise has beneficial effects on the immune system of athletes.

The influence of exercise training on anabolic hormones is especially important for growth and development in childhood years. The aim of this study was determine effect of 8 weeks of swimming training on secretion of growth hormone in 9-11 years old boys. To test the research hypothesis, the people who were willing to cooperate with the investigator randomly assigned to experimental group (n=15: age: 9.33±0.30, height: 130.46±7.53, weight: 27.04±7.39) and control group (n=15: age: 9.39±0.39, height: 133.53±7.52, weight: 27.15±4.92). Experimental group participated in 8 weeks swimming training with intensity of 45-65% HRmax for 3 times per week and 1 hour per session. During this time control group did not participate in this protocol and continue to routine activity. Fasting blood sample were collected 48 hours before and after of 8 weeks swimming training to assess serum growth hormone. 8 weeks swimming training led to significant increase on growth hormone in experimental group (P= 0.000). But increase growth hormone in control group not significant (P= 0.383). In result, 8 week of swimming training led to significant increase on secretion growth hormone in 9-11 years old boys.