The objective of this research was to investigate the effect of Taekwondo training for 16 weeks on obese elementary school students’ growth hormone and bone mineral density(BMD). The study was conducted on male obese elementary school students who reside in D metropolitan city and have body mass index (BMI) higher than 25%. The whole subject group had no particular diseases and did not regularly exercise more than twice a week. Based on basal movement, low section, Taekwondo gym and form pattern, the Taekwondo train program was composed of total 16 weeks; 4 weeks of introductory phase, 4 weeks of maintenance phase and 4 weeks of improvement phase one and two, respectively. BMD was analyzed using Dual-energy X-ray absorptiometry standard protocol. As a result, growth hormone was not significantly difference in group and exericse effects. In BMD, there was a significant difference between the two groups in BMD lumber spine(LS). In BMD-femur, there was a significant difference in the group (p<0.01) and time (p<0.05). In body composition, there was no statistically significant difference between body mass, body mass index, body fat mass and muscle volume. In conclusion, since 16 weeks of Taekwondo training had a positive effect on elementary students’ metabolic syndrome index, BMD and postural balance. We can deduce that elementary students need constant physical activity for their growth, physical development and physical health.

Ⅰ. INTRODUCTION
 Ⅱ. MATERIALS AND METHODS
  1. 연구대상
  2. 태권프로그램
  3. 성장호르몬 및 골밀도 분석
  4. 자료처리
 Ⅲ. RESULTS
  1. 성장호르몬 결과
  2. 골밀도 결과
 IV. DISCUSSION
 V. CONCLUSION
 VI. REFERENCES

• 양일구(Department of a college of general education, Dankook University) | Yang, IL Gu
• 이석준(Graduate school of physical education, Dankook University) | Lee, Suk Jun correspondence
• 박우영(Graduate school of sport science, Dankook University) | Park, Woo Young