Increasing plantarflexion angle during landing reduces vertical ground reaction forces, loading rates and the hip's contribution to support moment within participants

Journal of Sports Sciences
K Michael Rowley, James G Richards

Abstract

The ankle joint's role in shock absorption during landing has been researched in many studies, which have found that landing with higher amounts of plantarflexion (PF) results in lower peak vertical ground reaction forces and loading rates. However, there has not yet been a study that compares drop landings within participants along a quantitative continuum of PF angles. Using a custom-written real-time feedback program, participants adjusted their ankles to an instructed PF angle and dropped onto two force platforms. For increasing PF, peak ground reaction force and peak loading rate during weight acceptance decreased significantly. The hip's contribution to peak support moment decreased as PF at initial contact increased up to 30°. The ankle and knee contributions increased over this same continuum of PF angles. There appears to be no optimal PF angle based on peak ground reaction force and loading rate measurements, but there may be an optimum where joint contributions to peak support moment converge and the hip moment's contribution is minimised.

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Citations

May 29, 2018·Journal of Applied Biomechanics·John R HarryJanet S Dufek
May 20, 2020·International Journal of Environmental Research and Public Health·Cheng-Chieh LinCheng-Feng Lin
Jan 26, 2018·Journal of Strength and Conditioning Research·John R HarryJanet S Dufek
Jun 26, 2018·Journal of Strength and Conditioning Research·John R HarryJanet S Dufek
Feb 12, 2021·Journal of Sport Rehabilitation·Louis HoweTheodoros M Bampouras
Jul 3, 2021·International Journal of Environmental Research and Public Health·Cheng-Chieh LinCheng-Feng Lin

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