Journal article
Dynamic EMG during walking as an objective measurement of lower limb orthotic alignment
Basic and applied myology : BAM, Vol.7(2), pp.103-110
01 Jan 1997
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
An orthosis may be used to supplement reduced motor function in the lower limbs and associated ambulatory deficiencies. Optimal orthotic alignment (denotes range of ankle motion allowed by the orthosis) uses motor function efficiently yet avoids undue stress to joints and unsafe walking. Mechanically restricted joint motion alters gait muscle activation patterns. Soleus normally checks early stance phase tibial rotation by an eccentric contraction; a brace that restricts dorsiflexion may reduce soleus activity.
In this experimental work, 4 normal subjects and 4 polio survivors were fitted with ankle-foot orthoses. Surface EMG was recorded from five muscles on each subject in several orthotic alignment conditions. Stride EMGs for each muscle, subject and test condition were rectified, filtered, and averaged to create an ensemble averaged EMG profile. +/- 1 Standard deviation bands of the EMG profiles from various conditions (alignments) were then easily compared.
Quantitative EMG comparison was found to be sensitive enough to indicate changes in muscle activity. Changes were consistent across the normal subjects, and indicated compensation may occur in a standard way. In the polio survivor population an optimization rule that prioritized quadriceps activity reduction was used. Muscle responses to this condition were different after the accommodation period than those measured immediately after setting an alignment. Subject opinions of this condition were generally opposite to that expected, and the condition was rated unfavorably by the subject even though it spared the often overworked quadriceps muscles.
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Details
- Title
- Dynamic EMG during walking as an objective measurement of lower limb orthotic alignment
- Creators
- A EsquenaziM TalatyR SeliktarB Hirai
- Publication Details
- Basic and applied myology : BAM, Vol.7(2), pp.103-110
- Publisher
- Unipress Padova
- Number of pages
- 8
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- School of Biomedical Engineering, Science, and Health Systems; [Retired Faculty]
- Identifiers
- 991019170549604721
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- Medicine, Research & Experimental
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