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- W2076017773 abstract "Running shoe footwear has evolved over several decades to more capably stabilize the foot and attenuate shock. Contrary to intuition, it is clear that ground reaction force magnitudes are changed relatively little by footwear stiffness characteristics. However, it is likely some kinetic adaptations occur as shoe characteristics change. PURPOSE: This study used simple mass-spring modeling of the running leg to determine vertical stiffness of the shoe-leg structure under Barefoot, Firm and Soft running shoe conditions. METHODS: Vertical ground reaction force data were collected at 1000 Hz as runners (N = 10) ran over a force plate at 3.83 m/s. A five trial average was obtained for each footwear condition. From the force data, midstance peak force and center of mass vertical displacement were determined and used to calculate vertical stiffness. Firm and Soft running shoes had different midsole structures aimed at stability and cushioning. Stiffness of the shoes was about 300 and 200 kN/m across the heel area. RESULTS: Impact and Active peak forces (2.0 and 2.7 times body weight, respectively) were nearly constant across footwear conditions. However, vertical displacement of center of mass increased as shoe stiffness decreased (7.1, 7.8 and 8.0 cm, p < .01), this in turn affected vertical stiffness of the shoe-leg system which also decreased (27.6, 25.3 and 24.5 kN/m respectively, p < 01). Assuming the leg spring and shoe spring to be in series, vertical stiffness of the leg itself can be calculated, but this determination is substantially influenced by the area of the shoe involved in the foot-shoe interaction. CONCLUSION: Running footwear stiffness characteristics affect vertical displacement and stiffness of the body. This finding differs from the response of runners on varying surface stiffness where relatively constant displacement and stiffness have been observed (Ferris et al., 1998)." @default.
- W2076017773 created "2016-06-24" @default.
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- W2076017773 date "2002-05-01" @default.
- W2076017773 modified "2023-09-28" @default.
- W2076017773 title "ADJUSTMENT OF VERTICAL DISPLACEMENT AND STIFFNESS WITH CHANGES TO RUNNING FOOTWEAR STIFFNESS" @default.
- W2076017773 doi "https://doi.org/10.1097/00005768-200205001-00995" @default.
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