Table 1: Kinetics of serum concentrations of IGF-I and IGFBP-3, observed in soccer players in the U-15 category (n = 11) at different moments of the competitive season.

Competitive Season

 

Initial

Intermediate

Final

IGF-I (ng/mL)

Pre-training

445.54 ± 91.1

459.9 ± 67.52*

460.72 ± 94.65*

Post-training

455.09 ± 87.75

519 ± 115.39*

428.72 ± 87.33*

∆IGF-I

9.54 ± 3.36

59.09 ± 95+

-32 ± 49

IGFBP-3 (ng/mL)

Pre-training

4.46 ± 0.63

4.91 ± 1.04a

4.6 ± 0.97a

Post-training

4.61 ± 0.79

5.53 ± 1.66b

4.5 ± 0.79b

∆IGFBP-3

0.14 ± 0.16

0.62 ± 0.65

-0.01 ± 0.17

GH (ng/mL)

Pre-training

2.85 ± 2.94

4.29 ± 4.48

7.35 ± 7.36

Post-training

1.75 ± 2.31

4.11 ± 6.15

2.5 ± 2.57

∆GH

-1.1 ± 0.63

-0.18 ± 1.67

-4.85 ± 4.79

*Difference between moments Pre and Post - STS p ≤ 0.05

aDifference between moments intermediate - pre STS Vs. final - pre STS p = 0.03

bDifference between moments intermediate - post STS Vs. final - post STS p = 0.04

∆ = (post-training dosage - pre-training dosage).