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Quantitative analysis of static sitting posture in chronic stroke.
Sam Perlmutter1, Fang Lin, Mohsen Makhsous
1Interdepartmental Neuroscience Program, Northwestern University, USA.
Gait & Posture
|April 20, 2010
Summary
Individuals with chronic stroke exhibit persistent trunk control impairments, affecting unsupported sitting. This study quantified balance deficits using center of pressure analysis, revealing significant differences compared to healthy individuals.
Area of Science:
- Neuroscience
- Biomechanics
- Rehabilitation Science
Background:
- Unsupported sitting demands trunk postural stability, crucial for daily activities.
- Quantitative research on persistent trunk impairment post-stroke is limited.
- Understanding trunk control deficits is vital for stroke rehabilitation.
Purpose of the Study:
- To investigate unsupported sitting in individuals with chronic stroke.
- To analyze center of pressure (COP) signals for quantitative assessment of trunk control.
- To compare trunk stability between chronic stroke survivors and healthy controls.
Main Methods:
- Ten chronic stroke subjects and ten healthy controls sat on a force platform.
- Center of pressure (COP) signals were recorded under eyes closed, target fixation, and COP feedback conditions.
- Spatial and temporal COP signal analyses were performed, including sway area, displacements, and sample entropy.
Main Results:
- Stroke group exhibited significantly larger sway area and displacements across all conditions compared to controls.
- Stroke group showed reduced sample entropy in eyes closed and target conditions, indicating poorer postural control.
- COP feedback improved sway area and displacements in both groups, with increased sample entropy in the stroke group.
Conclusions:
- Trunk control necessary for unsupported sitting remains impaired in the chronic stage post-stroke.
- Quantitative COP analysis effectively highlights balance deficits related to trunk musculature.
- Further research on sitting balance is recommended to understand and address stroke-related deficits.
