. 2021 Apr 27;18(9):4646. doi: 10.3390/ijerph18094646

Table 4.

Stepwise regression analyses relating both maturity offset and chronological age (CA) with components of force-velocity (FV) profiles in sprinting and jumping, body size, and training experience

Sprinting	Model 1			Model 2			Model 3
Maturity offset	B	SE B	β	B	SE B	β	B	SE B	β
P_max	0.01	0	0.92 ^§	0.01	0	0.64 ^§	0.01	0.001	0.76 ^§
Training experience				0.39	0.06	0.36 ^§	0.38	0.06	0.36 ^§
RF peak							−7.76	2.22	−0.16 ^†
R² adjusted	0.849			0.897			0.909
CA	B	SE B	β	B	SE B	β	B	SE B	β
P_max	0.01	0	0.9 ^§	0.01	0	0.55 ^§	0.01	0	0.62 ^§
Training experience				0.58	0.08	0.43 ^§	0.53	0.08	0.4 ^§
Body size							0.12	0.04	0.12 *
R² adjusted	0.8			0.87			0.881
Jumping	Model 1			Model 2
Maturity offset	B	SE B	β	B	SE B	β	B	SE B	β
F₀	0.004	0	0.91 ^§	0.003	0	0.7 ^§	0.003	0	0.74 ^§
Training experience				0.43	0.06	0.4 ^§	0.36	0.05	0.33 ^§
FV slope							−0.11	0.2	−0.17 ^§
R² adjusted	0.834			0.901			926
CA	B	SE B	β	B	SE B	β	B	SE B	β
F₀	0.004	0	0.89 ^§	0.003	0	0.54 ^§	0.003	0	0.62 ^§
Training experience				0.61	0.08	0.46 ^§	0.54	0.07	0.4 ^§
FV slope							−0.12	0.3	−0.14 ^§
R² adjusted	0.792			0.880			0.896

FV slope, force-velocity slope; V₀, theoretical maximal velocity; F₀, theoretical maximal force; P_max, theoretical maximal power; FV deficit, percent difference respect to the optimal FV profile; Training experience: years of specific soccer training; Body size: product of body mass and stature residuals (individual values minus the mean); R² = Pearson’s multivariate coefficient of determination; B = unstandardized beta (regression) coefficient; SE B = standard error of B; β = standardized beta (regression) coefficient. * p < 0.05, ^† p < 0.01, ^§ p < 0.001.