Relação entre a força do quadril e do tronco com a cinemática tridimensional do tronco, quadril e joelho durante a aterrissagem de um salto unipodal

Abstract

Purpose: Kinematic changes have been correlated with different lower limb injuries, being some of these injuries more common in female athletes, and a likely predisposing factor to these changes is hip and trunk muscle weakness. Thus, the aim of this study was to evaluate the correlation among trunk and hip strength with three-dimensional trunk and lower-limb kinematics during a jump-landing task in female recreational athletes. Methods: Twenty-three healthy women recreational athletes aged between 18 and 35 years underwent evaluation of hip abductor, hip extensor, and lateral trunk muscle strength by manual dynamometry and three-dimensional trunk and lower-limb kinematics during the landing phase of a single-leg drop vertical jump. Pearson's correlation coefficients (r) were calculated to establish the relationship between hip and trunk strength and trunk, hip, and knee movements. Results: Greater hip extensor strength was found to be significantly associated with greater trunk flexion at initial contact. No significant correlations were found among the strength data and the peak values of kinematics during the landing phase. Conclusion: Considering that the greater trunk flexion is related to lower anterior cruciate ligament (ACL) load, patellofemoral stress and patellar tendon force, hip extensor muscle strengthening may be important to prevent and rehabilitate ACL injury, patellofemoral pain, and patellar tendinopathy.