The relationship between quadriceps/hamstring strength and anterior tibial shear force during a jump landing task

The relationship between quadriceps/hamstring strength and anterior tibial shear force during a jump landing task Public Deposited

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Bennett, Douglas R.
- Affiliation: College of Arts and Sciences, Department of Exercise and Sport Science

Abstract

Objective: To evaluate relationships between Anterior Tibial Shear Force (ATSF) and eccentric quadriceps strength (QuadEcc), concentric hamstring strength (HamCon), and the QuadEcc/HamCon ratio. Design: Correlational. Setting: Research laboratory. Participants: Thirty-three healthy female recreational athletes. Main Outcome Measure(s): ATSF was measured during a landing task via inverse dynamics. QuadEcc and HamCon were assessed at 60°/s, 180°/s, and 300°/s using isokinetic dynamometry. Results: QuadEcc and HamCon were not significantly related to ATSF at any testing velocity (p > 0.05). QuadEcc/HamCon was significantly related to ATSF at 60°/s (r = 0.529, p = 0.005) and 180°/s (r = 0.556, p = 0.003). Conclusion: QuadEcc and HamCon in isolation are not significantly related to ATSF. However, when considered as a functional ratio, these strength measures are predictors of ATSF. This suggests that high QuadEcc/HamCon ratios may predispose female athletes to higher ATSF and ACL injury risk. Key Words: knee injury, ACL, torque, strength ratios

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