The aims of the present study were to determine anthropometric and physical characteristics according to age and gender of young athletes, and to quantify the relationships among these characteristics. Sixty-four young high-level runners were divided into two groups according to their age: U14 = under 14 year’s athletes; U16 = under 16 year’s athletes. The U16 group presented higher values of the sprint 15 m (p < 0.01, d = 1.14) and modified agility test (p < 0.01, d = 0.66) than the U14 group. However, the boys group presented higher values in the 505 agility test (p < 0.01, d = 0.63), modified agility test (p < 0.01, d = 1.26), horizontal countermovement jump (p < 0.05, d = 0.56), vertical countermovement jump (p < 0.01, d = 0.61) and arm swim vertical countermovement jump (p < 0.01, d = 0.63) than the girls group.
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