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Brain Inhibition of Muscle Movement in Normal Volunteers

Primary Purpose

Dystonic Disorders

Status
Completed
Phase
Locations
United States
Study Type
Observational
Intervention
Sponsored by
National Institute of Neurological Disorders and Stroke (NINDS)
About
Eligibility
Locations
Outcomes
Full info

About this trial

This is an observational trial for Dystonic Disorders focused on measuring Transcranial, Magnetic, Stimulation, Motor, Cortex, Motor Cortex, Afferent Stimulation, Transcranial Magnetic Stimulation, Healthy Volunteer, HV

Eligibility Criteria

undefined - undefined (Child, Adult, Older Adult)All SexesAccepts Healthy Volunteers

INCLUSION CRITERIA: Twenty healthy volunteers older than age 18 will be recruited for the study. Their gender, age, or ethnic origin will not provide bias for inclusion to the study. All subjects will sign an informed consent prior to participation in the trial. EXCLUSION CRITERIA: Exclusion criteria for the trial will include any current medical or surgical condition or neurological or psychiatric illnesses. Furthermore, any individual who is on medication with potential influence on nervous system function, who has a pacemaker, an implanted medical pump, a metal plate or metal object in the skull or eye (for example, after brain surgery), or who has a history of seizure disorder will be excluded from the trial.

Sites / Locations

  • National Institute of Neurological Disorders and Stroke (NINDS)

Outcomes

Primary Outcome Measures

Secondary Outcome Measures

Full Information

First Posted
October 22, 2002
Last Updated
March 3, 2008
Sponsor
National Institute of Neurological Disorders and Stroke (NINDS)
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1. Study Identification

Unique Protocol Identification Number
NCT00047957
Brief Title
Brain Inhibition of Muscle Movement in Normal Volunteers
Official Title
The Effect of Peripheral Homotopic and Heterotopic Stimulation on Cortical Excitability
Study Type
Observational

2. Study Status

Record Verification Date
September 2005
Overall Recruitment Status
Completed
Study Start Date
October 2002 (undefined)
Primary Completion Date
undefined (undefined)
Study Completion Date
September 2005 (undefined)

3. Sponsor/Collaborators

Name of the Sponsor
National Institute of Neurological Disorders and Stroke (NINDS)

4. Oversight

5. Study Description

Brief Summary
This study will use transcranial magnetic stimulation, or TMS (described below), to examine how the brain controls muscle movement to prevent unwanted movements in surrounding muscles. For example, when a person moves a finger, a part of the brain called the cortex prevents unwanted movements in other fingers by a process called cortical inhibition. In people with the muscle disorder dystonia, cortical inhibition does not work properly and patients suffer from uncontrolled and sometimes painful movements. A better understanding of how this process works in normal people may shed light on what goes wrong in dystonia and how the condition can be treated. Healthy normal volunteers 19 years of age and older may be eligible for this study. Candidates will be screened with a medical history and physical and neurological examinations. People with a current medical or surgical condition or neurological or psychiatric illness may not participate, nor may individuals who are taking medication that may influence nervous system function. Participants will undergo TMS to record the electrical activity of muscles in the hand and arm that are activated by magnetic stimulation. For the procedure, subjects are seated in a chair with their hands placed on a pillow in their laps. A wire coil in placed on their scalps. A brief electrical current is passed through the coil, creating a magnetic pulse that stimulates the brain. Subjects will be asked to move their second finger in response to a loud beep or visual cue. In some trials, a brief, mild electrical shock will also be applied to the end of either the second or fifth finger. The shock is not painful. TMS may cause muscle, hand or arm twitching if the coil is near the part of the brain that controls movement, or it may induce twitches or temporary tingling in the forearm, head, or face muscles. The twitching may cause mild discomfort, but the procedure is rarely considered painful.
Detailed Description
The purpose of this study is to investigate the effect of homotopic and heterotopic sensory afferent input on surround inhibition in the motor cortex. Surround inhibition is a cortical phenomenon, the function of which may be to suppress unwanted movements in surrounding muscles during voluntary actions. In support of this, a recent study showed that motor output to the little finger was reduced during self-paced, voluntary movements of the index finger, despite an increase in spinal excitability. Work has also shown that in relaxed muscle, homotopic and heterotopic peripheral stimulation results in time dependent modulation of motor cortical excitability. However, no studies have examined the relationship between volitional movement and afferent sensory input on cortical surround inhibition. Therefore, the aim of this study is to examine the changes in surround inhibition when electrical stimulation is applied to either the finger being actively moved (homotopic stimulation) or a separate finger not involved in the movement (heterotopic stimulation) at different time periods prior to the initiation of movements to assess the affect of these stimuli on surround inhibition and excitation in the motor cortex.

6. Conditions and Keywords

Primary Disease or Condition Being Studied in the Trial, or the Focus of the Study
Dystonic Disorders
Keywords
Transcranial, Magnetic, Stimulation, Motor, Cortex, Motor Cortex, Afferent Stimulation, Transcranial Magnetic Stimulation, Healthy Volunteer, HV

7. Study Design

Enrollment
20 (false)

10. Eligibility

Sex
All
Accepts Healthy Volunteers
Accepts Healthy Volunteers
Eligibility Criteria
INCLUSION CRITERIA: Twenty healthy volunteers older than age 18 will be recruited for the study. Their gender, age, or ethnic origin will not provide bias for inclusion to the study. All subjects will sign an informed consent prior to participation in the trial. EXCLUSION CRITERIA: Exclusion criteria for the trial will include any current medical or surgical condition or neurological or psychiatric illnesses. Furthermore, any individual who is on medication with potential influence on nervous system function, who has a pacemaker, an implanted medical pump, a metal plate or metal object in the skull or eye (for example, after brain surgery), or who has a history of seizure disorder will be excluded from the trial.
Facility Information:
Facility Name
National Institute of Neurological Disorders and Stroke (NINDS)
City
Bethesda
State/Province
Maryland
ZIP/Postal Code
20892
Country
United States

12. IPD Sharing Statement

Citations:
PubMed Identifier
11222454
Citation
Abbruzzese G, Marchese R, Buccolieri A, Gasparetto B, Trompetto C. Abnormalities of sensorimotor integration in focal dystonia: a transcranial magnetic stimulation study. Brain. 2001 Mar;124(Pt 3):537-45. doi: 10.1093/brain/124.3.537.
Results Reference
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PubMed Identifier
10638440
Citation
Classen J, Steinfelder B, Liepert J, Stefan K, Celnik P, Cohen LG, Hess A, Kunesch E, Chen R, Benecke R, Hallett M. Cutaneomotor integration in humans is somatotopically organized at various levels of the nervous system and is task dependent. Exp Brain Res. 2000 Jan;130(1):48-59. doi: 10.1007/s002210050005.
Results Reference
background
PubMed Identifier
10910346
Citation
Hallett M. Transcranial magnetic stimulation and the human brain. Nature. 2000 Jul 13;406(6792):147-50. doi: 10.1038/35018000.
Results Reference
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Brain Inhibition of Muscle Movement in Normal Volunteers

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