The purpose of the study was to evaluate predicted maturity offset (time before age at PHV) and age at PHV (chronological age [CA] minus maturity offset) in a longitudinal sample of 58 under-13 club level soccer players in central Portugal for whom ages at PHV were estimated with the SITAR model. Two maturity offset prediction equations were applied: the original equation which requires CA sitting height, estimated leg length, height and weight, and a modified equation which requires CA and height. Predicted maturity offset increased, on average, with CA at prediction throughout the age range considered, while variation in predicted maturity offset and ages at PHV within CA groups was considerably reduced compared to variation in observed ages at offset and at PHV. Predicted maturity offset and ages at PHV were consistently later than observed maturity offset and age at PHV among early maturing players, and earlier than observed in late maturing players. Both predicted offset and ages at PHV with the two equations were, on average, later than observed among players maturing on time. Intra-individual variation in predicted ages at PHV with each equation was considerable. The results for soccer players were consistent with similar studies in the general population and two recent longitudinal studies of soccer players. The results question the utility of predicted maturity offset and age at PHV as valid indicators of maturity timing and status.

中文翻译：

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观察和预测足球运动员身高速度峰值时的年龄。

该研究的目的是在葡萄牙中部 58 名 13 岁以下俱乐部级别足球运动员的纵向样本中评估预测的成熟偏移（PHV 年龄之前的时间）和 PHV 年龄（实足年龄 [CA] 减去成熟偏移）。使用 SITAR 模型估计 PHV 的年龄。应用了两个成熟度偏移预测方程：需要 CA 坐高、估计腿长、身高和体重的原始方程，以及需要 CA 和身高的修改方程。平均而言，预测成熟度偏移增加，在整个考虑的年龄范围内预测成熟度偏移和 CA 组内预测成熟度偏移和 PHV 年龄的变化与偏移和 PHV 观察到的年龄变化相比显着减少。在早熟球员中，预测的 PHV 成熟度偏移和年龄始终晚于观察到的 PHV 成熟度偏移和年龄，而早于晚熟球员的观察。平均而言，使用这两个方程预测的 PHV 偏移量和年龄都比在按时成熟的球员中观察到的要晚。每个方程的 PHV 预测年龄的个体内差异是相当大的。足球运动员的结果与一般人群的类似研究和最近的两项足球运动员纵向研究一致。结果质疑预测的成熟度偏移和 PHV 年龄作为成熟时间和状态的有效指标的效用。平均而言，使用这两个方程预测的 PHV 偏移量和年龄都比在按时成熟的球员中观察到的要晚。每个方程的 PHV 预测年龄的个体内差异是相当大的。足球运动员的结果与一般人群的类似研究和最近的两项足球运动员纵向研究一致。结果质疑预测的成熟度偏移和 PHV 年龄作为成熟时间和状态的有效指标的效用。平均而言，使用这两个方程预测的 PHV 偏移量和年龄都比在按时成熟的球员中观察到的要晚。每个方程的 PHV 预测年龄的个体内差异是相当大的。足球运动员的结果与一般人群的类似研究和最近的两项足球运动员纵向研究一致。结果质疑预测的成熟度偏移和 PHV 年龄作为成熟时间和状态的有效指标的效用。