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Influence of Intermittent Endurance on Individual Playing Time in Games for U-18 Soccer Players and Takahiko Nishijima [Received November 13, 2013; Accepted August 18, 2014] The purpose of this study was to investigate the influence of intermittent endurance on individual playing time in games for U-18 soccer players. Subjects were twenty-four male soccer players (high school students) aged 16.7±0.8 years. Subjects performed the Yo-Yo intermittent recovery level 2 test (Yo-Yo IR2 test) for intermittent endurance. Individual playing time in official games and factors of substitution were recorded. Subject Yo-Yo IR2 test results were 1197±171m. When subjects were divided by Yo-Yo IR2 test results (intermittent endurance), high intermittent endurance subjects showed a tendency for greater playing time (%) in soccer games; however, low intermittent endurance subjects did not. The intermittent endurance of regular players (starters) in games was significantly higher than that of non-regular players (non-starters) as substitute members and non-members on the same team. Player (MF) who had the highest intermittent endurance was not substituted by physical factors but player (MF) who had the lowest intermittent endurance was substituted many times by physical factors. From these results, it was concluded that intermittent endurance influenced the individual playing time in games for U-18 soccer players. It was suggested that intermittent endurance of young soccer players should be developed throughout the year. Keywords: High-intensity running, Yo-Yo intermittent recovery level 2 test, Starters and non-starters, Member substitution |