Recently developed technological approaches using positional data and network analysis were adopted in this study to investigate the existence of drops in tactical performance from the first to the second half of official matches in two different age groups. Fifty outfield players from U-17 (n = 25) and U-20 (n = 25) youth academies were monitored over the 2020 competitive season. Players’ positional data were collected by GPS devices, and all matches were recorded for adoption of the Social Network Analysis approach. The individual and collective performances were monitored for both halves of the matches and compared between age group and match period using a mixed two-way ANOVA. Results indicated the absence of drops in collective tactical performance over the halves, although, on the individual scale, players reduced the spatial exploration from the first half to the second half. Older players presented higher density, LPWRatio and lower spatial exploration than younger players. Teams showed stable collective performance within the match, although drops in individual tactical performance were observed and were not age-dependent. Finally, older players tended to present a higher individual and collective performance.

本研究采用最近开发的使用位置数据和网络分析的技术方法来调查两个不同年龄段的官方比赛从上半场到下半场战术表现下降的情况。来自 U-17 ( n  = 25) 和 U-20 ( n = 25) 在 2020 年的竞争赛季中对青年学院进行了监测。球员的位置数据由 GPS 设备收集，并记录所有比赛以采用社交网络分析方法。对两半比赛的个人和集体表现进行监测，并使用混合双向方差分析在年龄组和比赛时段之间进行比较。结果表明，上半场的集体战术表现没有下降，尽管在个人尺度上，球员从上半场到下半场减少了空间探索。与年轻玩家相比，年长玩家呈现出更高的密度、LPWRatio 和更低的空间探索。球队在比赛中表现出稳定的集体表现，尽管观察到个人战术表现下降并且与年龄无关。最后，