Document Detail


Changes in muscle activation patterns in response to enhanced sensory input during treadmill stepping in infants born with myelomeningocele.
MedLine Citation:
PMID:  23158017     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Infants with myelomeningocele (MMC) increase step frequency in response to modifications to the treadmill surface. The aim was to investigate how these modifications impacted the electromyographic (EMG) patterns. We analyzed EMG from 19 infants aged 2-10 months, with MMC at the lumbosacral level. We supported infants upright on the treadmill for 12 trials, each 30 seconds long. Modifications included visual flow, unloading, weights, Velcro and lcriction. Surface electrodes recorded EMG from tibialis anterior, lateral gastrocnemius, rectus femoris and biceps femoris. We determined muscle bursts for each stride cycle and from these calculated various parameters. Results indicated that each of the five sensory conditions generated different motor patterns. Visual flow and friction which we previously reported increased step frequency impacted lateral gastrocnemius most. Weights, which significantly decreased step frequency increased burst duration and co-activity of the proximal muscles. We also observed an age effect, with all conditions increasing muscle activity in younger infants whereas in older infants visual flow and unloading stimulated most activity. In conclusion, we have demonstrated that infants with myelomeningocele at levels which impact the myotomes of major locomotor muscles find ways to respond and adapt their motor output to changes in sensory input.
Authors:
Annette Pantall; Caroline Teulier; Beverly D Ulrich
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Publication Detail:
Type:  Journal Article; Research Support, N.I.H., Extramural     Date:  2012-11-15
Journal Detail:
Title:  Human movement science     Volume:  31     ISSN:  1872-7646     ISO Abbreviation:  Hum Mov Sci     Publication Date:  2012 Dec 
Date Detail:
Created Date:  2012-11-29     Completed Date:  2013-05-15     Revised Date:  2013-12-04    
Medline Journal Info:
Nlm Unique ID:  8300127     Medline TA:  Hum Mov Sci     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  1670-87     Citation Subset:  IM    
Copyright Information:
Copyright © 2012 Elsevier B.V. All rights reserved.
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MeSH Terms
Descriptor/Qualifier:
Electromyography*
Exercise Test*
Humans
Infant
Kinesthesis / physiology
Meningomyelocele / physiopathology*,  rehabilitation*
Muscle Contraction / physiology*
Muscle, Skeletal / physiopathology
Photic Stimulation
Physical Therapy Modalities
Signal Processing, Computer-Assisted*
Touch / physiology*
Visual Perception / physiology*
Walking / physiology*
Weight-Bearing / physiology*
Grant Support
ID/Acronym/Agency:
R01 HD047567/HD/NICHD NIH HHS; R01HD047567/HD/NICHD NIH HHS
Comments/Corrections

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