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• W2512520360 abstract "Single-leg hopping in-place can be typically modeled using a spring-mass model. Within this model, the leg acts as a spring whose stiffness can be regulated to hop at different heights and frequencies. The control of vertical stiffness has been shown to be important for running and jumping performance, as well as injury prevention. It is known that adults increase vertical stiffness to hop at frequencies higher than preferred, but it is unknown if children younger than 11 years have a similar ability to control vertical stiffness. Further, little is known about the horizontal movement of the center-of-mass (COM) and foot positioning during hopping in both children and adults. The purpose of this study was to evaluate the validity of the spring-mass model in 5–11 years old children and compare horizontal COM and foot movement between children and adults. We found that single-leg hopping in children generally follows a spring-mass model and children are able to increase vertical stiffness with hopping frequency. Moreover, children demonstrate adult-like control strategies of decreasing the COM range and toe displacement but maintaining the COM positioning with increasing frequency. However, children showed a faster preferred frequency, elevated vertical stiffness normalized by body weight, a greater toe displacement between hops and a greater toe range within a trial. Together, single-leg hopping in place can generally be modeled in 5–11 years old children as a spring-mass model; however, children at this age are still developing their motor ability to control the COM and foot placement during hopping." @default.
• W2512520360 created "2016-09-16" @default.
• W2512520360 creator A5012917496 @default.
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• W2512520360 date "2016-10-01" @default.
• W2512520360 modified "2023-09-25" @default.
• W2512520360 title "Vertical stiffness and center-of-mass movement in children and adults during single-leg hopping" @default.
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• W2512520360 doi "https://doi.org/10.1016/j.jbiomech.2016.08.014" @default.
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