Please use this identifier to cite or link to this item: https://doi.org/10.1016/j.knee.2009.02.002
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dc.titleRegression relationships of landing height with ground reaction forces, knee flexion angles, angular velocities and joint powers during double-leg landing
dc.contributor.authorYeow, C.H.
dc.contributor.authorGoh, J.C.H.
dc.contributor.authorLee, P.V.S.
dc.date.accessioned2011-08-03T01:51:02Z
dc.date.available2011-08-03T01:51:02Z
dc.date.issued2009
dc.identifier.citationYeow, C.H., Goh, J.C.H., Lee, P.V.S. (2009). Regression relationships of landing height with ground reaction forces, knee flexion angles, angular velocities and joint powers during double-leg landing. Knee 16 (5) : 381-386. ScholarBank@NUS Repository. https://doi.org/10.1016/j.knee.2009.02.002
dc.identifier.issn09680160
dc.identifier.urihttp://scholarbank.nus.edu.sg/handle/10635/25327
dc.description.abstractGround reaction forces (GRF), knee flexion angles, angular velocities and joint powers are unknown at large landing heights, which are infeasible for laboratory testing. However, this information is important for understanding lower extremity injury mechanisms. We sought to determine regression relationships of landing height with these parameters during landing so as to facilitate estimation of these parameters at large landing heights. Five healthy male subjects performed landing tasks from heights of 0.15-1.05 m onto a force-plate. Motion capture system was used to obtain knee flexion angles during landing via passive markers placed on the lower body. An iterative regression model, involving simple linear/exponential/natural logarithmic functions, was used to fit regression equations to experimental data. Peak GRF followed an exponential regression relationship (R2 = 0.90-0.99, p < 0.001; power = 0.987-0.998). Peak GRF slope and impulse also had an exponential relationship (R2 = 0.90-0.96, p < 0.001; power = 0.980-0.997 and R2 = 0.90-0.99, p < 0.001; power = 0.990-1.000 respectively) with landing height. Knee flexion angle at initial contact and at peak GRF had an inverse-exponential regression relationship (R2 = 0.81-0.99, p < 0.001-p = 0.006; power = 0.834-0.978 and R2 = 0.84-0.97, p < 0.001-p = 0.004; power = 0.873-0.999 respectively). There was also an inverse-exponential relationship between peak knee flexion angular velocity and landing height (R2 = 0.86-0.96, p < 0.001; power = 0.935-0.994). Peak knee joint power demonstrated a substantial linear relationship (R2 = 0.98-1.00, p < 0.001; power = 0.990-1.000). The parameters analyzed in this study are highly dependent on landing height. The exponential increase in peak GRF parameters and the relatively slower increase in knee flexion angles, angular velocities and joint power may synergistically lead to an exacerbated lower extremity injury risk at large landing heights. © 2009 Elsevier B.V.
dc.description.urihttp://libproxy1.nus.edu.sg/login?url=http://dx.doi.org/10.1016/j.knee.2009.02.002
dc.sourceScopus
dc.subjectInitial contact
dc.subjectKnee flexion angles
dc.subjectLanding height
dc.subjectNon-linear/linear regression
dc.subjectPeak ground reaction force (GRF)
dc.typeArticle
dc.contributor.departmentORTHOPAEDIC SURGERY
dc.contributor.departmentLIFE SCIENCES INSTITUTE
dc.description.doi10.1016/j.knee.2009.02.002
dc.description.sourcetitleKnee
dc.description.volume16
dc.description.issue5
dc.description.page381-386
dc.identifier.isiut000270163000017
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