. 2019 Nov 19;18(4):729–737.

Table 1.

Characteristics and composition of the sample size without dropouts. Values are reported as mean ± standard deviation.

IG1	IG2	CG
n = 11 6^th German division age 22.7 ± 3.7 years height 181.1 ± 5.2 cm weight 76.9 ± 7.5 kg age of club entry (soccer) 4.8 ± 0.9 years soccer time per week 4-7 h/week	n = 9 3^th German youth division age 17.1 ± 0.9 years height 179.7 ± 7.6 cm weight 74.4 ± 11.7 kg age of club entry (soccer) 4.6 ± 0.8 years soccer time per week 4-7 h/week	n = 13 6^th, 7^th German division age 21.5 ± 1.4 years height 182.5 ± 6.9 cm weight 77.5 ± 6.1 kg age of club entry (soccer) 4.5 ± 1.5 years soccer time per week 4-7 h/week

IG1 intervention group 1; IG2 intervention group 2; CG control group.