THE EFFECTS OF HIP STRENGTH ON GLUTEAL MUSCLE ACTIVATION AMPLITUDES AND HOW THESE FACTORS PREDICT LOWER EXTREMITY KINEMATICS

THE EFFECTS OF HIP STRENGTH ON GLUTEAL MUSCLE ACTIVATION AMPLITUDES AND HOW THESE FACTORS PREDICT LOWER EXTREMITY KINEMATICS Public Deposited

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Homan, Katie Jo
- Affiliation: College of Arts and Sciences, Department of Exercise and Sport Science

Abstract

Objective: To evaluate the influence of hip strength on kinematic ACL injury risk factors and gluteal activation. Design: Cross-sectional. Setting: Research laboratory. Participants: Eighty-two healthy volunteers. Outcome Measures: Hip extension, external rotation, and abduction strength; gluteus maximus and medius electromyography (EMG); knee valgus, hip adduction, and hip internal rotation angles. Results: Peak knee valgus (p=0.016) and hip external rotation (p=0.023) angles were greater in individuals with weaker hip external rotators. Gluteus maximus EMG was greater in individuals with weaker hip extensors (p=0.031) and external rotators (p=0.043). Hip external rotation strength and gluteus maximus EMG amplitude predicted 7.9% and 12.1% of the variance in peak hip rotation (R= 0.281, p=0.039.) and knee valgus angles (R=0.348, p=0.006). Conclusion: Hip external rotation strength influences hip and knee kinematics related to ACL injury, thus increasing gluteal strength may be an important addition to ACL injury prevention programs. Key Words: ACL, strength, EMG, knee valgus

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