摘要：The purpose of this study was to investigate whether the victories achieved by national soccer teams in world championships in the under-17 and under-20 categories are repeated in the adult category. Data on the sporting lives of the soccer players who participated in international competitions in the under-17 and under- 20 categories and in the national teams were gathered. The data sources were the official FIFA (Fédération Internationale de Football Association; International Federation of Association Football) website via the internet. The findings indicate that a national team that became the champion in the under-17 category or the under-20 category did not result in the team or the players performing better in the adult soccer category. Hence, it is reasonable to conclude that the development of high-level performance in categories of young soccer players is not an indicator of high-level performance among adults.
关键词：Early Specialization;Long-Term Planning;Soccer;Youth Teams
