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Wavelet Analysis of Electromyography (EMG) in Cerebral Palsy

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. Identifier: NCT00504049
Recruitment Status : Completed
First Posted : July 19, 2007
Last Update Posted : July 22, 2010
National Institutes of Health (NIH)
Information provided by:
Shriners Hospitals for Children

Brief Summary:

Several methods exist to evaluate motor function in the child with cerebral palsy and are used to assess the outcome of a clinical intervention. However, these scales are not directed towards measuring the changes in muscle activity patterns that can result from the intervention. For example, there are classification scales aimed at measuring motor function and functional abilities, and indices of gait function. These scores, while providing a way to quantify function and mechanics, do not directly measure muscle activation characteristics. Therefore, these tests may be insensitive to how the intervention has directly affected muscle function, which is usually the focus of the intervention (i.e. botulinum toxin, functional electrical stimulation, dorsal rhizotomy). Muscle biopsies and motor evoked potentials can provide information about the muscle activation characteristics, however, they are invasive and there are concerns about using these techniques on the pediatric population and/or the practicality of clinical implementation, especially since they do not provide insight into how the muscle behaves during a functional task. One method that can be used to provide insight into muscle activity in a non-invasive and clinically meaningful manner is the use of surface electromyography (sEMG). Surface EMG is typically a routine part of clinical assessment and the evaluation of motor impairment in CP. However, the analysis of the data has been limited in most cases to examination of signal amplitude or differences in muscle onset and offset timing.

The long-term goal of this research is to develop an analysis method for sEMG that can be used during functional tasks for treatment planning, diagnostic, assessment purposes in CP. This is to be accomplished through the use of the continuous wavelet transform (CWT). By developing an assessment method based on muscle activity, it is believed that a clinically viable measurement tool can be devised that will provide a level of insight into the effects of an intervention on muscle pathophysiology that is not currently available. The first step in progressing towards this long-term goal is to determine the variability and range of expected time-frequency patterns that can be expressed in a given population (i.e., cerebral palsy) during the execution of a meaningful task (gait), and relate the time-frequency information back to more standard assessments

Condition or disease
Cerebral Palsy

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Study Type : Observational
Actual Enrollment : 32 participants
Observational Model: Case Control
Time Perspective: Prospective
Official Title: Wavelet Analysis of Surface EMG in Cerebral Palsy
Study Start Date : March 2007
Actual Study Completion Date : March 2009

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Information from the National Library of Medicine

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Ages Eligible for Study:   7 Years to 12 Years   (Child)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   Yes
Sampling Method:   Non-Probability Sample
Study Population
Children with spastic, diplegic cerebral palsy

Inclusion Criteria:

  • A diagnosis of spastic diplegic CP
  • Must be ambulatory without the use of orthotics
  • Between a GMFCS Level I and Level III
  • Between the ages of 7 and 13 years
  • Cleared by an orthopedic surgeon for risk of hip subluxation or dislocation and cannot have significant scoliosis (curvature > 40 degrees)
  • Seizure-free or seizure controlled
  • Has visuoperceptual skills and cognitive/communication skills sufficient to follow multiple step commands and to attend to tasks associated with data collection
  • Must be greater than 1 year post-surgery to the lower extremities
  • Must be greater then 6 months botulinum toxin injection
  • Passive range of motion in lower extremity joints must be greater than 10 degrees of flexion contracture at the hips as measured by the Thomas Test, at least 20 degrees of hip abduction bilaterally, less than 5 degrees of knee flexion contracture, popliteal angle less than 45 degrees, and at least 0 degrees of ankle dorsiflexion with the knee extended while the foot is in varus

Exclusion Criteria:

  • Children who do not meet the inclusion criteria will not be considered for the study.

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its identifier (NCT number): NCT00504049

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United States, Pennsylvania
Shriners Hospitals for Children
Philadelphia, Pennsylvania, United States, 19140
Sponsors and Collaborators
Shriners Hospitals for Children
National Institutes of Health (NIH)
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Principal Investigator: Richard T Lauer, PhD Shriners Hospitals for Children
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Responsible Party: Richard T. Lauer, Shriners Hospitals for Children Identifier: NCT00504049    
Other Study ID Numbers: 1R03NS048875-01A2 ( U.S. NIH Grant/Contract )
First Posted: July 19, 2007    Key Record Dates
Last Update Posted: July 22, 2010
Last Verified: January 2009
Keywords provided by Shriners Hospitals for Children:
Cerebral Palsy
Wavelet Analysis
Additional relevant MeSH terms:
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Cerebral Palsy
Neurologic Manifestations
Nervous System Diseases
Signs and Symptoms
Brain Damage, Chronic
Brain Diseases
Central Nervous System Diseases