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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. 相似文献
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The American Association for School Librarians suggests an important mission for school librarians is to ensure personal growth
through ongoing exposure to conferences, journal articles, webinars, presentations, and membership in professional organizations.
As professional educators, School Librarians should exemplify the vision for being life-long learners. Methods and means to
grow in the profession should be evaluated and examined for elements that lead to success in growth and maturity as professionals
in school library media. This article investigates the attributes of successful professional development experiences which
include learning environment, characteristics of learners, methodologies, and instructional design of staff development workshops. 相似文献
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