Lower extremity variability changes with drop-landing height manipulations. Academic Article uri icon

abstract

  • 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.

published proceedings

  • Res Sports Med

author list (cited authors)

  • Nordin, A. D., & Dufek, J. S.

citation count

  • 11

complete list of authors

  • Nordin, Andrew D||Dufek, Janet S

publication date

  • January 1, 2017 11:11 AM