We examined 24 high school Taekwondo students in C area for 3 weeks with a group of 12 of them on a 25 % dietary restriction of Kitogenic and the other group of 12 on a NKD, and analyzed their effects on body composition, stamina, antioxidant enzyme reactions and cytokine in peripheral blood. From the experiment, we were able to come up with following conclusions.

First, the result of the two experiments on body composition (Weight, BMI, Body fat percentage, Muscle mass, LBM) is significant. Weight and BMI significantly improved for both groups. Muscle mass and LBM have significantly decreased. The KD group has decreased more than that of the NKD group.

Secondly, the result of the experiments on stamina (2 kilometer run, mean power per weight on Winggate test, fatigability and parallelism) are significant. The KD group showed higher improvement on cardiovascular endurance and muscle endurance that those of the NKD group in the 2 km run and sit-up. The Winggate test, which tests anaerobic motor ability, showed that maximum power per weight decreased for the KD group compared to that of the NKD group, but mean power per weight and fatigability have improved more that those of the NKD group. The test of agility and muscle strength on 100 meter run, standing long jump, grip strength and parallelism decreased for both groups.

Thirdly, the antioxidant enzyme reaction (SOD, ROS, MDA) had no effect on both groups.

Lastly, there were no changes on cytokine for both groups.

In conclusion, the Kitogenic Diet has improved body weight, BMI, and body fat percentage. It was, however, unavoidable to lose muscle mass and LBM due to the weight loss. Stamina, such as cardiovascular endurance and muscular endurance, has shown improvement even though there was the weight loss. We were also able to confirm that agility, which is one of the most important attributes for Taekwondo players, decreased the first week of the KD experiment, but it recovered to its original state during the rest of the weeks. The KD group has also shown that there were no change on antioxidant enzyme reaction and cytokine, which proves that the KD method of diet is a safe method without causing oxidative stress and inflammatory reactions.