Associação entre o valgismo dinâmico de joelho e a altura do salto vertical durante a impulsão em atletas de voleibol

Abstract

The vertical jump represents an important part of more complex motor actions in volleyball such as the spike, service actions and block and, increasingly, the performance of athletes jumping is a decisive factor to the final result. 63% of these athletes’ knee injuries occur during the jumps, either during takeoff or landing. Dynamic alterations of the knee joint, such as valgus, associated with the complex demands involved in volleyball seem to increase the demand placed on the athlete's musculoskeletal system, which can hinder the performance and contribute to the development of various types of injury and dysfunction in the knee joint. Thus, this study aims to investigate the influence of dynamic knee valgus in the vertical jump height at the time of the impulse on volleyball athletes. During preseason, 74 Basketball athletes belonging to a sport club were evaluated, being 44 female and 30 male. The dynamic knee valgus was measured as the frontal plane projection angle of the knee during the impulse. The evaluation of vertical jump height was performed with a Jump Test contact carpet. The Statistical Method of Linear Regression was used to verify the association between the two variables. No Association was observed between the vertical jump height and the knee dynamic valgus during impulse. Despite this factor the knee dynamic knee valgus is a factor for overuse injuries at the knee joint and its occurrence during the impulse should be avoided. The technical training of the vertical jump can improve the athlete’s performance. More studies are necessary to verify the influence oh dynamic knee valgus in vertical jump height.