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| Research article summary (published 30 Dec 2001): |
Treadmill exercise negatively affects visual contribution to static postural stability.
Full Abstract
This study was undertaken to explore the nature of impaired postural stability following physical exercise. Nine healthy subjects (aged 24 +/- 3 years) were subjected to 30 min of treadmill walking or running on two separate occasions. Walking and running speeds (1.9 to 2.2 m/s) were chosen to induce equal energy expenditure. During treadmill exercise, kinematic analysis of head movement was performed. Prior to and immediately following exercise, postural sway was evaluated as mean velocity of centre of pressure (VCOP), measured on a force plate during 30 s quiet stance with eyes open or eyes closed. The results indicate that exercise increased two-dimensional postural sway by 9 - 19 % in eyes open, but not in the eyes closed condition. The deteriorating effect of exercise was both evident in the sagittal and in the frontal plane, although the effect on the former was slightly more transient. Post-exercise sway values were significantly higher after running than after walking. Kinematic analysis of head movement confirmed larger vertical displacement and acceleration pattern in running compared to walking. It is concluded that exercise of moderate intensity deteriorates visual contribution to postural stability. The effect is evident as an initial destabilisation in the sagittal direction and a less transient loss of latero-lateral stability. Running tends to disturb postural stability more than walking, possibly due to more excessive head movement and disturbance of vestibular and visual information centres.
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Author information
Author/s: Derave, W (W); Tombeux, N (N); Cottyn, J (J); Pannier, J L (JL); De Clercq, D (D);
Affiliation: Department of Movement and Sports Sciences, University of Ghent, Ghent, Belgium.
Journal and publication information
Publication Type: Clinical Trial; Comparative Study; Journal Article
Journal: International journal of sports medicine (Int J Sports Med), published in Germany. (Language: eng)
Reference: 2002-Jan; vol 23 (issue 1) : pp 44-9
Dates: Created 2002/01/04; Completed 2002/02/19; Revised 2006/11/15;
PMID: 11774066, status: MEDLINE (last retrieval date: 11/6/2008)
Sourced from the National Library of Medicine. Abstract text and other information may be subject to copyright.
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