Effect of Taekwondo Training on Physical Fitness and Growth Index According to IGF-1 Gene Polymorphism in Children.
10.4196/kjpp.2015.19.4.341
- Author:
Bonghan LEE
1
;
Kijin KIM
Author Information
1. Department of Physical Education, Keimyung University, Daegu 704-701, Korea. kjk744@kmu.ac.kr
- Publication Type:Original Article
- Keywords:
Elementary school students;
Growth index;
IGF-1 gene polymorphism;
Physical fitness;
Taekwondo training
- MeSH:
Child*;
Glucose;
Hand Strength;
Heterozygote;
Homozygote;
Humans;
Insulin-Like Growth Factor I*;
Leg;
Male;
Physical Fitness*;
Thigh
- From:The Korean Journal of Physiology and Pharmacology
2015;19(4):341-347
- CountryRepublic of Korea
- Language:English
-
Abstract:
This study analyzed the effect of regular Taekwondo training for 16 weeks on physical fitness and growth index depending on different IGF-1 gene polymorphisms. The subjects of the study were 44 male students who were 8 year years old. The IGF-1 gene showed the highest frequency of 18 CA repeat (190 bp) in 50% of subjects, and was found in the homozygote (n=11), heterozygote (n=22) and non-carriers (n=11). The results of the physical fitness and growth index among the gene polymorphism groups indicated no significant differences but the expected height of the non-carrier group was significantly high (p<0.05). After Taekwondo training, the homozygote group and the non-carrier groups demonstrated significant (p<0.05) increase in grip strength and in time in the standing with one leg while closing eyes test, respectively. Only the homozygote group had a significant (p< 0.05) increase in thigh circumference. IGF-1 concentration significantly (p<0.05) increased in the heterozygote group, while HOMA-IR significantly (p<0.05) decreased in the homozygote group. Furthermore, there was a significant (p<0.05) decrease in glucose in both the homozygote and the non-carriers groups. The difference between physical fitness and growth index depending on the IGF-1 gene polymorphism after Taekwondo training did not show consistent impact.
