Abstract
The study aim was to evaluate associations between hip and ankle strength, ROM and YBT-LQ. The study involved 66 healthy males (age: 25.2+6.8 years). Each participant was assessed with ankle DF ROM, hip IR ROM, ER ROM and hip ABD, EXT and ER muscle isometric strength. The YBT-LQ test was performed for both limbs (stance and kicking leg). Forward two-step multiple linear regression analysis was performed to determine relationships between a predictor set and the criterion variable. Of 6 input variables for regression models, only 2 (ankle DF ROM, hip ABD strength) explained variance of YBT-LQ performance. Variance for anterior, posteromedial (PM) and posterolateral (PL) reach distances were explained from R2 = 0.15 to R2 = 0.49, but the models’ composition in PM and PL differed between legs. YBT-LQ composite score in both legs was explained by the same model, including ankle DF ROM and hip ABD (R2 = 0.44; R2 = 0.25). Hip ABD strength and ankle DF ROM assessment may be useful in individuals with poor YBT-LQ test performance to detect specific musculoskeletal deficits. Moreover, the regression models in stance leg for all reaches and composite score were more predictive than for the kicking leg.