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Energy absorption as a predictor of leg impedance in highly trained females

UNCG Author/Contributor (non-UNCG co-authors, if there are any, appear on document)
Anthony S. Kulas (Creator)
David H. Perrin, Provost and Executive Vice Chancellor (Creator)
Randy J. Schmitz, Associate Professor (Creator)
Sandra J. Shultz, Associate Professor (Creator)
Mary A. Watson (Creator)
Institution
The University of North Carolina at Greensboro (UNCG )
Web Site: http://library.uncg.edu/

Abstract: Although leg spring stiffness represents active muscular recruitment of the lower extremity during dynamic tasks such as hopping and running, the joint-specific characteristics comprising the damping portion of this measure, leg impedance, are uncertain. The purpose of this investigation was to assess the relationship between leg impedance and energy absorption at the ankle, knee, and hip during early (impact) and late (stabilization) phases of landing. Twenty highly trained female dancers (age = 20.3 ± 1.4 years, height = 163.7 ± 6.0 cm, mass = 62.1 ± 8.1 kg) were instrumented for biomechanical analysis. Subjects performed three sets of double-leg landings from under preferred, stiff, and soft landing conditions. A stepwise linear regression analysis revealed that ankle and knee energy absorption at impact, and knee and hip energy absorption during the stabilization phases of landing explained 75.5% of the variance in leg impedance. The primary predictor of leg impedance was knee energy absorption during the stabilization phase, independently accounting for 55% of the variance. Future validation studies applying this regression model to other groups of individuals are warranted.

Additional Information

Publication
Journal of Applied Biomechanics, 22:177-185
Language: English
Date: 2006
Keywords
Landing, Lower extremity mechanics, Energetic