Title
Kinematics and dynamics of burst transitions Kinematics and dynamics of burst transitions
Author
Faculty/Department
Faculty of Sciences. Biology
Publication type
article
Publication
Washington, D.C. ,
Subject
Psychology
Sociology
Economics
Human medicine
Source (journal)
Journal of motor behavior. - Washington, D.C.
Volume/pages
46(2014) :4 , p. 267-276
ISSN
0022-2895
ISI
000335882500008
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
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.
E-info
https://repository.uantwerpen.be/docman/iruaauth/3a08b5/e6c7711.pdf
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Handle