Journal
GAIT & POSTURE
Volume 38, Issue 4, Pages 956-961Publisher
ELSEVIER IRELAND LTD
DOI: 10.1016/j.gaitpost.2013.05.001
Keywords
Gait initiation; Parkinson's disease; Essential Tremor; Anticipatory postural adjustments; Motor control
Categories
Funding
- University of Florida College of Health and Human Performance Pre-doctoral Fellowship
- NIH [R21 AG033284-01A2, T32 DC008768-05]
- University of Florida
- University of Florida College of Health and Human Performance Graduate Teaching Assistantship
- NPF
- Michael J. Fox Foundation
- Parkinson Alliance
- Smallwood Foundation
- UF Foundation
- USF CME office
- PeerView
- Vanderbilt University
- Medtronic
- ANS/St. Jude
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Gait initiation is a transitional task involving a voluntary shift from a static, stable position to a relatively less-stable state of locomotion. During gait initiation, anticipatory postural adjustments precede stepping in order to generate forward momentum while balance is maintained. While deficits in gait initiation are frequently reported for persons with Parkinson's disease, there is a paucity of information regarding gait initiation performance in persons with Essential Tremor. We investigated anticipatory postural adjustments and spatiotemporal characteristics of gait initiation in persons with Essential Tremor and compared them to persons with Parkinson's disease as well as age-matched neurologically healthy adults. Twenty-four persons with Essential Tremor, 31 persons with Parkinson's disease, and 38 age-matched controls participated. We compared anterior-posterior and mediolateral center of pressure movements and spatiotemporal stepping characteristics during gait initiation among the three groups using Mann-Whitney U-tests with Bonferroni corrections for multiple comparisons and one-way ANOVAs. Persons with Parkinson's disease demonstrated significantly reduced displacement and velocity of the center of pressure during early phases of anticipatory postural adjustments relative to controls. Displacement of the center of pressure was also reduced in persons with Essential Tremor, although at a later stage of the gait initiation process. Persons with Parkinson's disease and Essential Tremor demonstrated similar reductions in step length during gait initiation when compared to controls. Persons with Parkinson's disease and Essential Tremor exhibit different deficits in gait initiation when compared to healthy older adults. Therefore, this study provides further evidence differentiating motor control features in these movement disorders. (c) 2013 Elsevier B.V. All rights reserved.
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