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Effects of approach velocity and foot-target characteristics on the visual regulation of step length

Bradshaw, Elizabeth J. and Sparrow, W.A. 2001, Effects of approach velocity and foot-target characteristics on the visual regulation of step length, Human movement science, vol. 20, no. 4 - 5, pp. 401-426, doi: 10.1016/S0167-9457(01)00060-4.

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Title Effects of approach velocity and foot-target characteristics on the visual regulation of step length
Author(s) Bradshaw, Elizabeth J.
Sparrow, W.A.
Journal name Human movement science
Volume number 20
Issue number 4 - 5
Start page 401
End page 426
Publisher Elsevier BV, North-Holland
Place of publication Amsterdam, Netherlands
Publication date 2001-11
ISSN 0167-9457
1872-7646
Keyword(s) locomotion
visual perception
object
perceptual motor coordination
Summary Two questions emerge from the literature concerning the perceptual-motor processes underlying the visual regulation of step length. The first concerns the effects of velocity on the onset of visual control (VCO), when visual regulation of step length begins during goal-directed locomotion. The second concerns the effects of different obstacles such as a target or raised surface on step length regulation. In two separate experiments, participants (Experiment 1 & 2: n=12, 6 female, 6 male) walked, jogged, or sprinted towards an obstacle along a 10 m walkway, consisting of two marker-strips with alternating black and white 0.50 m markings. Each experiment consisted of three targeting or obstacle tasks with the requirement to both negotiate and continue moving (run-through) through the target. Five trials were conducted for each task and approach speed, with trials block randomised between the six participants of each gender. One 50 Hz video camera panned and filmed each trial from an elevated position, adjacent to the walkway. Video footage was digitized to deduce the gait characteristics. Results for the targeting tasks indicate a linear relationship between approach velocity and accuracy of final foot placement (r=0.89). When foot placement was highly constrained by the obstacle step length shortened during the entire approach. VCO was found to occur at an earlier tau-margin for lower approach velocities for both experiments, indicating that the optical variable ‘tau' is affected by approach velocity. A three-phase kinematic profile was found for all tasks, except for the take-off board condition when sprinting. Further research is needed to determine whether this velocity affect on VCO is due to ‘whole-body' approach velocity or whether it is a function of the differences between gait modes.
Language eng
DOI 10.1016/S0167-9457(01)00060-4
Field of Research 110601 Biomechanics
HERDC Research category C1 Refereed article in a scholarly journal
Copyright notice ©2001, Elsevier Science B.V.
Persistent URL http://hdl.handle.net/10536/DRO/DU:30001187

Document type: Journal Article
Collection: School of Health Sciences
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