Esta es la versión de autor del artículo publicado en: This is an author produced version of a paper published in:Physical Therapy in Sport 24 (2017) Effectiveness of a stress management pilot program aimed at reducing the incidence of sports injuries in young football (soccer) players ABSTRACT Objectives: Several attempts to reduce the incidence of sport injuries using psychosocial interventions produced fruitful, although inconclusive results. This paper presents the effectiveness and implementation issues of a pilot 3-month stress-management and muscle relaxation program aimed at reducing sport injury incidence.Design: Pre-post treatment-non treatment group comparison.Program administration: The program was administered by a trained psychologist on a once-a-week, one-hour session basis.Participants: Seventy-four male soccer players from four National Youth league teams voluntarily participated. Teams were randomly assigned to either treatment/ non-treatment group.Measures: Injury protocol, Self-monitoring cards, Athletes' satisfaction and commitment survey, Coaches' interview.Results: Group main effect and Time-Group interaction effect were both statistically significant, F(1,60) = 8.30, p = .005, 2 p = .121, with the average number of injuries larger in the post-treatment phase of Non-treatment group (p = .005, 2 p = .077).There was a significant decrease in the average number of injuries for the RUNNING HEAD: A PILOT STRESS-MANAGEMENT PROGRAM TO REDUCE SPORT INJURIES 2 intervention group before and after implementing the program (p < .001, 2 p = .309).Conclusions: A controlled implementation of a psychosocial program was effective in reducing youth soccer sport injuries, with a high level of satisfaction and commitment from the athletes, as well as high acceptance from the coaches.