The relation between dynamic balance and frontal plane knee, pelvic and trunk alignment in single leg squat
Poster Presentation XML
Authors
1Shiraz university
2Professor of University of Tehran
Abstract
Introduction: Having good balance and joints kinematics known as an important factors to prevent musculoskeletal injuries especially in functional movements and sports activity,dynamic balance and lower limb kinematics are results of proper function of neuromuscular control so it seems they could be correlated.the aim of this study was assessing the relation between these two factors in a single leg squat.
Methodology: 40 healthy female physical education students with the mean age of (21.86±2) participated in this study.Dynamic balance was measured by using star excursion balance test (SEBT), data have been recorded from anterior, posteriomedial and posterolateral direction while standing on the dominant leg, general score was calculated by summing data of three direction.Trunk side bend, knee valgus and pelvic drop were measured by video analyzing (high speed camera, 100 HZ) at the end of single leg squat (mean knee flexion=59.5±7.6). Pierson-correlation statistical test (SPSS 21 software) was used to test a relation between balance and body alignment data.
Results: The results of statistical test showed no significant correlation (p˃0.05) between total balance score (2.67±0.23, mean±sd), anterior (0.99±0.1,mean±sd), posteromedial (0.82±0.09, mean±sd) and posterolateral (0.86±0.11, mean±sd) scores with trunk side bend (-3.1±2.7, mean±sd), pelvic drop (-1.81±4.3, mean±sd) and knee valgus (18.35±8.1, mean±sd).
Discussion: The results showed no correlation between trunk and lower extremity alignment in the frontal plane and dynamic balance on one leg squat. One study results showed that balance training affects sagittal plane kinematics during single-legged drop landing and reduces knee valgus. The results of this study and other studies indicate the relation between balance and injury and dynamic balance is considered as a predictor of injury. Since the movement strategy for create the perfect body motion, postural stability and balance is similar and is affected by proper neuromuscular control, it was expected to find a relation between dynamic balance and body alignment, however we didn’t, but it was possible to find a relation if we examined in other task like drop jump movement, in which neuromuscular system encounters more challenges .also this result my was affected by subjects characteristics, because our subjects were physically active with a relatively good neuromuscular control but testing cases with poor neuromuscular and balance control may show different results. Therefore, it is suggested to test more challenging tasks, cases with poor neuromuscular control and test the rotatory movements of lower extremity in transvers plane.
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