NDLI: Visuomotor adaptation of voluntary step initiation in older adults.

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Visuomotor adaptation of voluntary step initiation in older adults.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Tseng, Shih-Chiao Stanhope, Steven J. Morton, Susanne M.
Description	Country affiliation: United States Author Affiliation: Tseng SC ( Department of Physical Therapy & Rehabilitation Science, University of Maryland School of Medicine, Baltimore, MD, USA.)
Abstract	It has been suggested that feedforward planning of gait and posture is diminished in older adults. Motor adaptation is one mechanism by which feedforward commands can be updated or fine-tuned. Thus, if feedforward mechanisms are diminished in older adults, motor adaptation is also likely to be limited. The purpose of the study was to compare the ability of healthy older versus young adults in generating a voluntary stepping motor adaptation in response to a novel visual sensory perturbation. We recorded stepping movements from 18 healthy older and 18 young adults during baseline and adaptation stepping blocks. During baseline, the stepping target remained stationary; in adaptation, a visual perturbation was introduced by shifting the target laterally during mid-step. We compared adaptation between groups, measured by improvements in endpoint accuracy and movement duration. Older adults adapted stepping accuracy similarly to young adults (accuracy improvement: 29.7 + or - 27.6% vs. 37.3 + or - 22.9%, older vs. young group respectively, p = 0.375), but showed significant slowness during movement. Thus older adults were able to achieve accuracy levels nearly equivalent to younger adults, but only at the expense of movement speed, at least during the early adaptation period (movement duration: 1143.7 + or - 170.6 ms vs. 956.0 + or - 74.6 ms, p < 0.001). With practice, however, they were able to reduce movement times and gain speed and accuracy to levels similar to young adults. These findings suggest older adults may retain the ability for stepping adaptations to environmental changes or novel demands, given sufficient practice.
File Format	HTM / HTML
ISSN	09666362
e-ISSN	18792219
DOI	10.1016/j.gaitpost.2009.10.001
Journal	Gait & Posture
Issue Number	2
Volume Number	31
Language	English
Publisher	Elsevier
Publisher Date	2010-02-01
Publisher Place	Great Britain (UK)
Access Restriction	Open
Subject Keyword	Adaptation, Physiological Psychomotor Performance Research Support, N.i.h., Extramural Research Support, Non-u.s. Gov't Discipline Orthopedics Comparative Study Gait Fixation, Ocular Posture Biomechanical Phenomena Time Factors Visual Perception Physiology Analysis Of Variance
Content Type	Text
Resource Type	Article
Subject	Orthopedics and Sports Medicine Rehabilitation Biophysics Sports Science

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VISUOMOTOR ADAPTATION OF VOLUNTARY STEP INITIATION IN OLDER ADULTS

Voluntarily changing step length or step width affects dynamic stability of human walking.

Lateral step initiation behavior in older adults.

The influence of sensory information on two-component coordination during quiet stance.

Gait variability in healthy old adults is more affected by a visual perturbation than by a cognitive or narrow step placement demand.

Early onset of stabilizing strategies for gait and obstacles: older adults with Down syndrome.

Adaptation of gait termination on a slippery surface in Parkinson's disease.

Voluntary changes in step width and step length during human walking affect dynamic margins of stability.

Postural adaptations to repeated optic flow stimulation in older adults.

Visuomotor adaptation of voluntary step initiation in older adults.

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VISUOMOTOR ADAPTATION OF VOLUNTARY STEP INITIATION IN OLDER ADULTS

Voluntarily changing step length or step width affects dynamic stability of human walking.

Lateral step initiation behavior in older adults.

The influence of sensory information on two-component coordination during quiet stance.

Gait variability in healthy old adults is more affected by a visual perturbation than by a cognitive or narrow step placement demand.

Early onset of stabilizing strategies for gait and obstacles: older adults with Down syndrome.

Adaptation of gait termination on a slippery surface in Parkinson's disease.

Voluntary changes in step width and step length during human walking affect dynamic margins of stability.

Postural adaptations to repeated optic flow stimulation in older adults.

Visuomotor adaptation of voluntary step initiation in older adults.