Korean J Physiol Pharmacol.  2015 Jul;19(4):341-347. 10.4196/kjpp.2015.19.4.341.

Effect of Taekwondo Training on Physical Fitness and Growth Index According to IGF-1 Gene Polymorphism in Children

• Lee B
• Kim K

• KMID: 2285577
• DOI: http://doi.org/10.4196/kjpp.2015.19.4.341

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.

Keyword

Elementary school students; Growth index; IGF-1 gene polymorphism; Physical fitness; Taekwondo training

MeSH Terms

Child*
Glucose
Hand Strength
Heterozygote
Homozygote
Humans
Insulin-Like Growth Factor I*
Leg
Male
Physical Fitness*
Thigh
Glucose
Insulin-Like Growth Factor I

Figure

• 

  Fig. 1 The capillary electrophoresis of CA repetition Upper: CA repetitive heterogeneous; Middle: 4 CA repetitive heterogeneous; Lower: Homogeneous.

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  Fig. 2 Difference before and after the Taekwondo training for the physical fitness factors according to the IGF-1 gene polymorphisms *p<0.05.

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  Fig. 3 Difference before and after the Taekwondo training for the circumference depending on the IGF-1 gene polymorphisms *p<0.05, +p<0.001.

• 

  Fig. 4 Difference before and after the Taekwondo training for the blood factor depending on the IGF-1 gene polymorphisms *p<0.05, **p<0.01, +p<0.001.

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