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Relative Age Effects in Korean Football: Analysis of Age-Specific International Teams
Korean J Sports Med 2019;37:94-100
Published online September 1, 2019;  https://doi.org/10.5763/kjsm.2019.37.3.94
© 2019 The Korean Society of Sports Medicine.

Tae-Seok Jeong1, Sang-Yeol Bang1, Sehwan Park1, Young-Soo Lee2, Yong-Rae Kim2, Young-Seok Kim3

1SPIK Sports Medicine Clinic and Performance Center, Seoul, 2Department of Sports Science, Sejong University, Seoul, 3Korea Sport Industry Development Institute, Pohang University of Science and Technology, Pohang, Korea
Correspondence to: Young-Seok Kim
Korea Sport Industry Development Institute, Pohang University of Science and Technology, 77 Cheongam-ro, Nam-gu, Pohang 37673, Korea
Tel: +82-54-279-8843, Fax: +82-54-279-8852, E-mail: tessj@hanmail.net

*This research project was supported by the Sports Promotion Fund of Seoul Olympic Sports Promotion Foundation from Ministry of Culture, Sports and Tourism.
Received July 5, 2019; Revised August 12, 2019; Accepted August 13, 2019.
This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
 Abstract
Purpose: This study aimed to identify relative age effects of South Korea national male football teams that participated in 38 international competitions in age-specific categories from 2000 to 2018; U-16 (n=176), U-17 (n=82), U-19 (n=198), U-20 (n=147), and U-23 (n=166).
Methods: Available information on birth-dates, heights, and body weights of South Korean elite male football players was collected from the official websites. Chi-square test was conducted and odds ratios were calculated with 95% confidence interval in order to examine differences of quarter distribution between expected and observed subgroups.
Results: The birth distributions observed in each team were significantly different than those expected in general population of the same age (U-16: 2=59.364, p<0.05; U-17: 2=36.829, p<0.05; U-19: 2=51.697, p<0.05; U-20: 2=39.531, p<0.05) except U-23 (2=17.759, p=0.087). The magnitude of birth distribution was 3.2 times higher in the first quarter compared to that in the fourth quarter and was decreased in accordance with age. In accordance with age, the distribution of 쐁ompetition age group was significantly decreased in each team (U-16, 91%; U-17, 89%; U-19, 76%; U-20, 63%; U-23, 42%; p<0.05) but that of 쐕nder-competition age group was increased (U-16, 9%; U-17, 11%; U-19, 24%; U-20, 37%; U-23, 58%; p<0.05). There is also significant difference in distribution between both 쐁ompetition and 쐕nder-competition age group at the same tournament category (p<0.05).
Conclusion: Conclusively, these findings indicate that Korean players who are in the early stage of development have higher 쐒elative age effects than those in the late stage of development. This may implicate that it is necessary to develop strategies for relatively late-mature players who have potentials in terms of skills and intelligence of football.
Keywords : Football, Relative age, Talent
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