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Pre-swing deficits in forward propulsion, swing initiation and power generation by individual muscles during hemiparetic walking
- Source :
- Journal of Biomechanics. 43:2348-2355
- Publication Year :
- 2010
- Publisher :
- Elsevier BV, 2010.
-
Abstract
- Clinical studies of hemiparetic walking have shown pre-swing abnormalities in the paretic leg suggesting that paretic muscle contributions to important biomechanical walking subtasks are different than those of individuals without disability. Three-dimensional forward dynamic simulations of two representative hemiparetic subjects with different levels of walking function classified by self-selected walking speed (i.e., limited community = 0.4–0.8 m/s and community walkers = >0.8 m/s) and a speed-matched control were generated to quantify individual muscle contributions to forward propulsion, swing initiation and power generation during the pre-swing phase (i.e., double support phase proceeding toe-off). Simulation analyses identified decreased paretic soleus and gastrocnemius contributions to forward propulsion and power generation as the primary impairment in the limited community walker compared to the control subject. The non-paretic leg did not compensate for decreased forward propulsion by paretic muscles during pre-swing in the limited community walker. Paretic muscles had the net effect to absorb energy from the paretic leg during pre-swing in the community walker suggesting that deficits in swing initiation are a primary impairment. Specifically, the paretic gastrocnemius and hip flexors (i.e., iliacus, psoas and sartorius) contributed less to swing initiation and the paretic soleus and gluteus medius absorbed more power from the paretic leg in the community walker compared to the control subject. Rehabilitation strategies aimed at diminishing these deficits have much potential to improve walking function in these hemiparetic subjects and those with similar deficits.
- Subjects :
- Male
medicine.medical_specialty
medicine.medical_treatment
Acceleration
Biomedical Engineering
Biophysics
Double support phase
Walking
Propulsion
Models, Biological
Article
medicine
Humans
Orthopedics and Sports Medicine
Muscle, Skeletal
Gait
Gait Disorders, Neurologic
Leg
Rehabilitation
business.industry
Biomechanics
Middle Aged
Swing
Biomechanical Phenomena
Paresis
body regions
Preferred walking speed
Hemiparesis
Case-Control Studies
Physical therapy
Female
medicine.symptom
business
human activities
Subjects
Details
- ISSN :
- 00219290
- Volume :
- 43
- Database :
- OpenAIRE
- Journal :
- Journal of Biomechanics
- Accession number :
- edsair.doi.dedup.....b594038271c05853458ddfcf1b36cc92