Figure 2. Change in GH, IGF-1 and IGFBP3 between each time period across 2 soccer seasons in young soccer players (A, C, E) and control subjects (B, D, F). GH, growth hormone; IGF-1, insulin-like growth factor-1, IGFBP3, insulin-like growth factor binding protein-3; T0: first test; T1: second test; T2: third test; T3: fourth test; T4: fifth test. $, (p < 0.001): Hormonal change from T0-T1; µ, (p < 0.001): Hormonal change from T0-T2; £, (p < 0.001): Hormonal change from T0-T3; ¥, (p < 0.001): Hormonal change from T1-T2; §, (p < 0.001): Hormonal change from T2-T3; #, (p < 0.001): Hormonal change from T3-T4; *, (p < 0.001): Hormonal change from T0-T4.