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Title
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Kinematics and dynamics of burst transitions
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Author
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Abstract
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| Subjects (N = 14) were instructed to walk at comfortable walking speed and to start sprinting on an external (visual) stimulus. This is a burst transition. To accelerate maximally, different strategies can be used. The choice for a strategy was hypothesized to be (a) dependent of the body's dynamical status, which is in its turn dependent on the signal timing within the gait cycle; and (b) influenced by the performance and efficacy of the different strategies. Three-dimensional kinematics and ground reaction forces were used to discriminate between strategies and to calculate work (W-total). Distance laser data yielded performance measures and the work related to the forward acceleration (W-objective). Efficacy was calculated as the ratio of W-objective to W-total. Subjects mainly used 2 strategies among others depending on the timing of the stimulus: (a) subjects placed their body center of mass (BCOM) in front of their center of pressure (COP) by tilting the trunk forward and flexing the knee, resulting in a sudden forward acceleration but a relatively fair efficacy; (b) subjects placed their COP behind their BCOM by placing the foot of the swing leg backward. This led to a high performance with high efficacy and was therefore the most ecologically relevant. |
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Language
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English
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Source (journal)
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Journal of motor behavior. - Washington, D.C.
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Publication
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Washington, D.C.
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2014
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ISSN
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0022-2895
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DOI
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10.1080/00222895.2014.896780
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Volume/pages
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46
:4
(2014)
, p. 267-276
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ISI
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000335882500008
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Full text (Publisher's DOI)
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Full text (publisher's version - intranet only)
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