Lower extremity variability changes with drop-landing height manipulations.
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Landing is a common lower extremity injury mechanism in sport, with potential connections to movement control accessed through variability measures. We investigated intra-subject lower extremity variability changes following drop-landing height manipulations using standard deviation (SD) and coefficient of variation (CV) among lower extremity peak sagittal joint angles and moments. Fourteen healthy participants completed five drop-landing trials from five heights 20%, 60%, 100%, 140% and 180% maximum vertical jump height (MVJH). Peak joint angles and moments increased with greater landing height (p<0.001), highlighting inter-joint differences (Flexion: Knee > Hip > Ankle, p<0.001; Extensor Moment: Hip > Knee > Ankle, in excess of 60% MVJH, p<0.05). Kinematic and kinetic SD increased with variable magnitudes, while CV decreased at greater landing heights (p0.016). Decreased relative variability under greater task demands may underscore non-contact injury mechanisms from repetitive loading of identical structures.
author list (cited authors)
Nordin, A. D., & Dufek, J. S.
complete list of authors
Nordin, Andrew D||Dufek, Janet S