Effects of the FIFA 11 + warm-up programme on motor performance in U-15 female soccer players: a randomized controlled trial.

The results of the study indicate that the intervention had a highly significant and substantial effect on agility performance; the high level of significance of the group × time interaction ( p < 0.001) and large effect size (η p 2 = 0.512) clearly demonstrate the intervention-specific effect of the marked reduction in IA duration observed in the experimental group (F = 23.056, p < 0.001, η p 2 = 0.512).

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In contrast, although both groups showed slight improvements in 30 m sprint performance (experimental: Δ = -0.10 s; control: Δ = -0.05 s), the group × time interaction did not reach statistical significance (F = 1.126, p = 0.300, n p 2 = 0.049).

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