Fig. 1From: Associations between match participation, maturation, physical fitness, and hormonal levels in elite male soccer player U15: a prospective study with observational cohortCorrelation coefficients (95%CI) the minutes of playing soccer player in the compositions with the skeletal age (years); maturity offset (years); Soccer training (months); VO2max (ml.kg−1.min−1); Fatigue index (seconds); CMJ indicates the best of countermovement jumps performance (cm); GH, and IGF1 levels (ng/dl)Back to article page