![]() ![]() : The side effects of the 11+ on performance have not been generally reviewed. It seems that playing freely for several training sessions could strengthen the tactical behavior of each line, enhancing team lines' regularity in youth-soccer categories. On the other hand, U-16s' tactical behavior based on team lines barely changed (i.e. Cohen's d ø moderate) U-14s team lines' behavior, especially those who played freely. The results suggest that the short-term training intervention affected considerably (i.e. FIFA 11 PLUS WARM UP PDF SERIESnode: change in the centroid position (CCP), line: interpersonal distance between teammates (dyads), and area: surface area (SA)) and their time series approximate entropy (ApEn) normalized measures in subgroups based on team lines (goal-keeper-defenders, defenders-midfielders, and midfielders-forward) before and after the training intervention in an eight-on-eight game using a local positioning system (LPS). Tactical behavior was assessed by the three geometrical primitives' representations (i.e. a minimum number of touches, no return pass allowed, forward pass after a back pass) that modified the cooperative motor interactions between teammates. The free-play group played freely without restrictions, while the conditioned group played constrained by artificial rules (i.e. Each team was divided into two groups, free-play and conditioned, that faced each other during three 7-min eight-on-eight games in four training sessions. Two Spanish under-14s (U-14s: n = 16) and under-16s (U-16s: n = 16) teams took part in the study. This study aimed to assess the effects of modified games playing freely and introducing artificial rules on tactical behavior based on team lines during the team-possession game phase in two youth-soccer categories. Team-lines structures are particular subsystems determined strategically by the formation chosen by the team coach, and despite its relevance, no study has analyzed training effects on tactical behavior based on team lines. FIFA11+ Kids was found to be an effective approach to decrease the injury risk among young football players, which is worth generalizing extensively. Compared with normal warm-up training, FIFA11+ Kids significantly reduced overall injury risk (RR = 0.52 p < 0.00001), severe injury risk (RR = 0.33 p = 0.0004), lower extremity injury risk (RR = 0.51 p < 0.00001), knee injury risk (RR = 0.45 p = 0.0009), and ankle injury risk (RR = 0.56 p = 0.01) in young football players. ![]() A total of 230 articles were screened, 6 of which were finally included in the meta-analysis. Methodological quality was assessed using the Physiotherapy Evidence Database (PEDro) scale. Risk ratios (RRs) were calculated for each outcome. The primary outcome was overall injuries, and the secondary outcomes were severe, ankle, knee, and lower extremity injuries. PubMed, Web of Science, Embase, Cochrane Library, and China National Knowledge Infrastructure were searched from 1 January 2016 to 24 August 2022. This systematic review and meta-analysis aimed to summarize the effects of FIFA11+ Kids on injury prevention in young football players. This paper summarises 18 years of scientific and on-field work in injury prevention by an international sports federation (FIFA), from formulating the aim to make its sport safer to the worldwide dissemination of its injury-prevention programme in amateur football.įIFA11+ Kids is a warm-up program specially designed to prevent football injuries in children. Since then, FIFA has developed and evaluated its injury-prevention programmes ‘The 11’ and ‘FIFA 11+’ have demonstrated in several scientific studies how simple exercise-based programmes can decrease the incidence of injuries in amateur football players. In 1994, the Fédération Internationale de Football Association (FIFA) established its Medical Assessment and Research Centre (F-MARC) with the aim ‘to prevent football injuries and to promote football as a health-enhancing leisure activity, improving social behaviour’. In the last decade, injury prevention has received a lot of attention in sports medicine, and recently international sports-governing bodies, such as the International Olympic Committee, declared the protection of the athletes’ health as one of their major objectives. ![]()
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