Mostafa Zarei1, Hamed Abbasi2, Parisa Namazi1, Mojtaba Asgari3, Nikki Rommers4, Roland Rössler5. 1. Department of Sport Rehabilitation and Health, Faculty of Sport Science, Shahid Beheshti University, Tehran, Iran. 2. Department of Sport Injuries and Corrective Exercises, Sport Sciences Research Institute, Tehran, Iran. 3. Institute of Sport and Sports Science, TU Dortmund University, Germany. 4. Department of Movement and Sports Sciences, Vrije Universiteit Brussel, Belgium; Department of Movement and Sports Sciences, Ghent University, Belgium; Research Foundation Flanders (FWO), Belgium; Amsterdam Collaboration on Health & Safety in Sports & Department of Public and Occupational Health, Amsterdam Movement Sciences, VU University Medical Center, Netherlands. 5. Amsterdam Collaboration on Health & Safety in Sports & Department of Public and Occupational Health, Amsterdam Movement Sciences, VU University Medical Center, Netherlands; Department of Sport, Exercise, and Health, University of Basel, Switzerland. Electronic address: roland.roessler@unibas.ch.
Abstract
OBJECTIVE: To assess the effectiveness of the 11+ Kids warm-up programme regarding injury reduction in male high-level children's football players. DESIGN: Cluster-randomised controlled trial. METHOD: Male youth football teams of Iran's high-level football schools were invited to participate. Inclusion criteria were: teams are competing in the highest league of their province; players are between 7 and 14 years old; regular training takes place at least twice per week. Teams were excluded if they used an injury prevention measure. Participating clubs were randomised to an intervention (INT, N = 20 teams) and a control group (CON, N = 22 teams), stratified by the number of teams and the age group. The groups were blinded against each other. The follow-up period was one season (9 months). INT replaced their warm-up by 11+ Kids. CON performed a standard warm-up programme. The primary outcome was the injury incidence density (injuries per 1000 h of football exposure), compared between groups by incidence rate ratios (RR). RESULTS:In total, 64,047 h of football exposure of 962 players (INT = 443 players, 31,934 h of football, CON = 519 players, 32,113 h of football) were recorded. During the study, 90 (INT = 30; CON = 60) injuries occurred. The overall injury incidence density in INT was reduced by 50% compared to CON (RR 0.50; 95%-CI 0.32, 0.78). No injuries occurred during the execution of the intervention exercises. CONCLUSIONS: The 11+ Kids reduces injuries in high-level children's football players, thus supporting player health and potentially performance and player development.
RCT Entities:
OBJECTIVE: To assess the effectiveness of the 11+ Kids warm-up programme regarding injury reduction in male high-level children's football players. DESIGN: Cluster-randomised controlled trial. METHOD: Male youth football teams of Iran's high-level football schools were invited to participate. Inclusion criteria were: teams are competing in the highest league of their province; players are between 7 and 14 years old; regular training takes place at least twice per week. Teams were excluded if they used an injury prevention measure. Participating clubs were randomised to an intervention (INT, N = 20 teams) and a control group (CON, N = 22 teams), stratified by the number of teams and the age group. The groups were blinded against each other. The follow-up period was one season (9 months). INT replaced their warm-up by 11+ Kids. CON performed a standard warm-up programme. The primary outcome was the injury incidence density (injuries per 1000 h of football exposure), compared between groups by incidence rate ratios (RR). RESULTS: In total, 64,047 h of football exposure of 962 players (INT = 443 players, 31,934 h of football, CON = 519 players, 32,113 h of football) were recorded. During the study, 90 (INT = 30; CON = 60) injuries occurred. The overall injury incidence density in INT was reduced by 50% compared to CON (RR 0.50; 95%-CI 0.32, 0.78). No injuries occurred during the execution of the intervention exercises. CONCLUSIONS: The 11+ Kids reduces injuries in high-level children's football players, thus supporting player health and potentially performance and player development.
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