The effects of initial ankle posture on energy return and impact loading characteristics

dc.contributor.advisorLafortune, M.A.
dc.contributor.authorBauman, Marvin Dean of Human Biology and Nutritional Sciencesen_US of Guelphen_US of Scienceen_US
dc.description.abstractThe repeated impact loading of the musculoskeletal system that occurs during running has the potential to cause injury. This research investigates initial ankle posture effects upon impact loading and energy return. Four initial ankle postures were used (12.5$\sp\circ$ of dorsiflexion; a flatfooted impact; 12.5$\sp\circ$ of plantarflexion; 25$\sp\circ$ of plantarflexion). A human pendulum modality (Lafortune and Lake, 1995c), which provided control of the initial impact conditions, was used to simulate running impacts. Impact force and tibial and head accelerations were recorded to quantify impact severity and energy return. A joint model was also developed to estimate ankle joint compressive loads at the time of the impact peak. The flatfooted contact produced the most severe impacts but the smallest joint force. The dorsiflexed ankle posture produced less severe impacts but larger joint forces. The two plantarflexed conditions resulted in the least severe impacts and the largest joint forces. The plantarflexed conditions were also more effective at storing and returning energy to the system.
dc.publisherUniversity of Guelphen_US
dc.rights.licenseAll items in the Atrium are protected by copyright with all rights reserved unless otherwise indicated.
dc.subjectEnergy return
dc.subjectImpact loading
dc.titleThe effects of initial ankle posture on energy return and impact loading characteristics


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