Document Detail


EMG-Lengthening Velocity Relation in Plantar Flexors During Stance Phase of Gait in Patients with Hypertonia after Acquired Brain Injury.
MedLine Citation:
PMID:  22465583     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
OBJECTIVE: To examine the velocity-dependent change in medial gastrocnemius (MG) activity during stance phase of gait in patients with moderate-to-severe resting hypertonia after stroke or traumatic brain injury (TBI). DESIGN: Cohort study. SETTING: Motion analysis laboratory in a tertiary-care rehabilitation hospital. PARTICIPANTS: Convenience sample of chronic TBI and stroke (N=11 each) patients and age- and sex-matched healthy controls (N=22). INTERVENTION: Not applicable. MAIN OUTCOME MEASURES: Frequency and gain (steepness) of positive (>0) and significant positive (>0, goodness of fit p≤0.05) EMG-lengthening velocity (EMG-LV) linear regression slope in MG during stance phase of gait. RESULTS: Positive and significant positive slopes were found significantly more often on the more-affected (MA) than less-affected (LA) side in patients with TBI but not stroke. Both the frequencies of positive and significant positive slopes on the MA side in TBI patients were also significantly higher than in controls. However, neither the gain of positive nor significant positive EMG-LV slope was different between MA and LA sides or in comparison to controls. Positive slope parameters were not related to Ashworth score on the MA side. CONCLUSIONS: The frequency and gain of positive EMG-lengthening slope did not effectively differentiate patients from controls nor they were related to the resting muscle hypertonia. Motor output during MG lengthening in stance phase of gait is apparently not exaggerated or related to resting hypertonia in chronic TBI and stroke patients. Thus, changes in gait during stance can not be ascribed to increased stretch-reflex activity in MG muscle after acquired brain injury.
Authors:
John W Chow; Stuart A Yablon; Dobrivoje S Stokic
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-3-29
Journal Detail:
Title:  Archives of physical medicine and rehabilitation     Volume:  -     ISSN:  1532-821X     ISO Abbreviation:  -     Publication Date:  2012 Mar 
Date Detail:
Created Date:  2012-4-2     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  2985158R     Medline TA:  Arch Phys Med Rehabil     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2012 the American Congress of Rehabilitation Medicine. Published by Elsevier Inc. All rights reserved.
Affiliation:
Center for Neuroscience and Neurological Recovery, Methodist Rehabilitation Center, Jackson, MS.
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