Efeito do programa Fifa11 + Kids na cinemática do membro inferior, no torque flexor e extensor do joelho, no risco de sobrecarga articular e no desempenho funcional em jogadores de futebol: um ensaio clínico randomizado controlado

Abstract

Knee injuries, such as those involving the anterior cruciate ligament (ACL), are frequent in soccer, and are characterized by immediate disability. Thus, the quantification of the risk of knee injury has been stimulated to target injury prevention programs, such as FIFA 11+ Kids. Given the above, the aim of the present study was to evaluate the knee extensor and flexor torque, the risk of joint overload, and the functional agility performance in young soccer players before and after the FIFA 11+ Kids protocol. Furthermore, twenty-seven male soccer players (9-11 years old) participated in this randomized controlled clinical trial, randomly allocated to the FIFA 11+ Kids training group (FG, n = 14) or the control training group (CG, n = 13). Participants were assessed for knee flexor and extensor torque and agonist / antagonist ratio using isometric dynamometer. They were also evaluated for the two-dimensional kinematics (2D) of the lower limb during drop landing, necessary to estimate the risk of knee overload, using a clinic-based prediction algorithm. In addition, they were assessed for functional performance using the agility T test, before and after 8 weeks of intervention. Through a comparative clinical study (manuscript 1), an increase in knee extensor and flexor torque and a reduction in the time to peak knee flexor torque in the FG was identified, without improvement in the agonist / antagonist relationship and in functional performance. Through another comparative study (manuscript 2), a significant reduction in the risk of knee overload in the FG was identified, but without significant difference in relation to the CG. It was concluded that the FIFA 11+ Kids 8-week program is able to increase the isometric muscle strength of the knee and reduce the peak flexor torque time, without however favoring the agility performance. In addition, it was able to reduce the risk of knee overload, which should encourage its use in injury risk reduction programs in this population.