Countermovement strategy changes with vertical jump height to accommodate feasible force constraints

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In this study, we developed a curve-fit model of countermovement dynamics and examined whether the characteristics of a countermovement jump can be quantified using the model parameter and its scaling; we expected that the model-based analysis would facilitate an understanding of the basic mechanisms of force reduction and propulsion with a simplified framework of the center of mass (CoM) mechanics. Ten healthy young subjects jumped straight up to five different levels ranging from approximately 10% to 35% of their body heights. The kinematic and kinetic data on the CoM were measured using a force plate system synchronized with motion capture cameras. All subjects generated larger vertical forces compared with their body weights from the countermovement and sufficiently lowered their CoM position to support the work performed by push-off as the vertical elevations became more challenging. The model simulation reasonably reproduced the trajectories of vertical force during the countermovement, and the model parameters were replaced by linear and polynomial regression functions in terms of the vertical jump height. Gradual scaling trends of the individual model parameters were observed as a function of the vertical jump height with different degrees of scaling, depending on the subject. The results imply that the subjects may be aware of the jumping dynamics when subjected to various vertical jump heights and may select their countermovement strategies to effectively accommodate biomechanical constraints, i.e., limited force generation for the standing vertical jump.
Publisher
ELSEVIER SCI LTD
Issue Date
2014-09
Language
English
Article Type
Article
Keywords

STRETCH-SHORTENING CYCLE; PERFORMANCE; ENERGY

Citation

JOURNAL OF BIOMECHANICS, v.47, no.12, pp.3162 - 3168

ISSN
0021-9290
DOI
10.1016/j.jbiomech.2014.06.013
URI
http://hdl.handle.net/10203/194688
Appears in Collection
ME-Journal Papers(저널논문)
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