## 1 Introduction
In addition, the countermovement jump offers a practical method to monitor fatigue and recovery [13], further highlighting its versatility as a diagnostic tool in both individual and team settings. When used systematically, this assessment effectively guides individualized training programs and addresses specific performance deficits [5,9]. Studies investigating the F-V profile in senior football teams highlight players' positional differences, reflecting the specific physical demands of each role [6,14]. For instance, defenders demonstrate higher F\({}_{0}\) values compared to midfielders and forwards, as reported by a study comparing sprint mechanical properties in football players [4]. In contrast, forwards exhibit higher v\({}_{0}\) and P\({}_{\text{max}}\) values, which are essential for explosive accelerations and sprints during offensive transitions [14]. In addition, elite midfielders often display balanced F-V profiles, emphasizing their hybrid roles that combine high-intensity running with technical skills [15]. These findings emphasize how F-V profiles vary not only by position but also by competitive level, underlining the importance of tailored training programs to address specific neuromuscular and tactical demands [6,14]. Despite the extensive application of the F-V profile in athletic populations [16], several studies have already examined F-V profiles in football players at different levels and positions [14; 17; 18]. However, most of this research has been conducted on adult or elite-level athletes, with limited attention to young football players, particularly regarding the interaction between competitive levels and positional roles [6; 14]. This gap in the literature is critical, as it limits the development of evidence-based training programs tailored to the specific neuromuscular and physical demands of young players [12]. Developmental stages greatly influence F-V characteristics, with variations in force and velocity capacities potentially impacting performance and increasing the risk of imbalances if not adequately addressed [12; 14]. Moreover, positional demands in football require distinct physical profiles, yet the interplay between these demands and developmental factors in young players remains poorly understood [14; 16]. Previous studies have demonstrated the relevance of the F-V profile in optimizing performance and addressing imbalances in adult athletes, but limited research has explored its application in younger populations [3; 8]. Investigating how competitive levels and positional roles shape F-V profiles in young players while also providing direct training applications is essential for bridging this gap. The purpose of the current study was to analyze the F-V profiles of young football players competing in the national championships, investigating how competitive levels and positional roles influence key F-V variables (including F\({}_{0}\), V\({}_{0}\), P\({}_{\text{max}}\) and the players' jumping ability). It was hypothesized that players at higher competitive levels would exhibit more balanced F-V profiles due to increased exposure to structured training regimens and advanced neuromuscular development. Furthermore, positional differences were expected to result in specific F-V characteristics, with forwards demonstrating higher velocity capacities and defenders excelling in force production.