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The Bias toward Biological Maturation through the Talent Selection in Japanese Elite Youth Soccer Players

机译：日本优秀青少年足球运动员选材对生物成熟的偏向。

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In the present study, we aimed to determine whether the advancement in skeletal age (SA) of youth soccer players relative to chronological age was dependent on the maturation spurt or selection bias toward biological maturation. These factors were investigated using cross-sectional and mixed longitudinal study designs. Height, body mass, SA, and maturation differences in 181 youth soccer players (age range; 9.3-16.0 years) were measured. SAs were assessed using the Tanner-Whitehouse three (TW3) and Japanese-standardized SA (J-SA) methods. Thirty-seven of the 181 players (age range; 9.6-13.0 years) then participated in a one-year follow-up study. The participants were divided into seven age groups (under 10 (U10)-U16). Cross-sectional differences in all measurements between the categories were compared with annual increment data. There were significant cross-sectional differences in height (14.9 vs. 10.9±3.3 cm), body mass (13.4 vs. 8.2±3.1 kg), and SA (J-SA: 1.7 vs. 1.0±0.6 yrs; TW3: 2.6 vs. 1.5±0.8 years) between the U12 and U13 groups (p<0.01 each). Furthermore, these differences were higher than those for mixed longitudinal data. These findings imply that advanced biological maturation in youth soccer players may depend on selection bias towards the early biological maturation.
机译：在本研究中，我们旨在确定青年足球运动员的骨骼年龄（SA）相对于年龄的增长是否取决于成熟突增或对生物学成熟的选择偏见。使用横截面和混合纵向研究设计研究了这些因素。测量了181名青年足球运动员（年龄段; 9.3-16.0岁）的身高，体重，SA和成熟度差异。使用Tanner-Whitehouse三（TW3）和日本标准化SA（J-SA）方法评估SA。然后，在181名运动员中，有37名（年龄段; 9.6-13.0岁）参加了为期一年的随访研究。参与者分为七个年龄段（10岁以下（U10）-U16）。将类别之间所有度量的横截面差异与年度增量数据进行比较。身高（14.9 vs. 10.9±3.3 cm），体重（13.4 vs. 8.2±3.1 kg）和SA（J-SA：1.7 vs. 1.0±0.6 yrs; TW3：2.6 vs. U12和U13组之间的距离为1.5±0.8岁（每个p <0.01）。此外，这些差异高于混合纵向数据的差异。这些发现暗示青年足球运动员的高级生物成熟可能取决于对早期生物成熟的选择偏见。

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