Influence of Theta Burst Stimulation and Carbidopa-Levodopa on Motor Performance in Stroke Patients

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: NCT00366184
Recruitment Status : Completed
First Posted : August 21, 2006
Last Update Posted : July 2, 2017
Information provided by:
National Institutes of Health Clinical Center (CC)

Brief Summary:

This study will examine whether transcranial magnetic stimulation (TMS) of the brain used in combination with carbidopa-levodopa is more effective in temporarily improving the speed of hand movement in stoke patients than TMS alone. In TMS, a wire coil is held on the patient's scalp. A brief electrical current is passed through the coil, creating a magnetic pulse that stimulates the brain. The effect of TMS on the muscles is detected with small metal disk electrodes taped to the skin of the arms or legs. Carbidopa-levodopa is a medication usually used to treat Parkinson's disease, but it may improve the effect of theta burst stimulation.

Two kinds of TMS are used in this study. In single-pulse TMS one or two pulses are delivered at a time in order to measure brain activity at that moment. In repetitive TMS (rTMS), a series of pulses are given in short bursts, temporarily altering brain activity. The type of rTMS used in this study is called theta burst stimulation.

Healthy normal volunteers and people who had a stroke 6 months or more before entering the study may be eligible to participate. All candidates must be between 18 and 90 years of age. Stroke patients must have had significant hand weakness and made a moderate or good recovery and must be able to move either the thumb or the wrist on the affected hand reasonably well. Normal volunteers must be right-handed.

Participants complete the testing for this study in four main sessions scheduled at least a week apart and five short follow-up sessions. At each main session, participants take either a carbidopa-levodopa tablet or a placebo (a look-alike inactive substance). Stroke patients have their arm and hand function assessed using two tests. One requires them to insert pegs into holes; the other includes writing, lifting various objects, and performing activities like turning pages, feeding or stacking checkers.

All subjects complete a questionnaire regarding their mood and alertness and then perform tests of thumb or wrist movement. For this test, a small electrical stimulus is applied to the side of the hand and the subject must respond to the stimulus as quickly as possible by making a thumb or wrist movement. This is repeated several times over about 3 minutes. A second test follows in which the subject moves the thumb or wrist in response to a beep from a speaker. This test is repeated several times over about 8 minutes. Some measurements are taken using single-pulse TMS during the beginning, middle and end of this test. In two of the four sessions, theta burst stimulation is applied after the single-pulse TMS and in the other two sessions, sham theta burst stimulation is applied.

Five follow-up sessions are scheduled one day after each main session and one week following the final one. In these sessions, subjects perform an abbreviated form of the thumb movement tests.

Condition or disease

Detailed Description:


Theta Burst Stimulation (TBS) is a type of sub-threshold repetitive Transcranial Magnetic Stimulation (rTMS) which has effects on the excitability of human motor cortex that outlast stimulation by up to an hour. TBS also affects performance of a motor task for up to 30 minutes after stimulation in healthy subjects, and improves reaction times (and increases corticospinal excitability) in patients with chronic stroke (Talelli 2005). The advantages of TBS over other non-invasive brain stimulation strategies are its low intensity, short duration of application and long lasting effects.

The spectrum of behavioral effects investigated is so far modest. Evidence is accumulating that dopaminergic agents enhance synaptic plasticity (Otani 1998) and improve motor training in healthy humans (Meintzchel 2005). After stroke, Carbidopa-Levodopa has also enhanced the response to physiotherapy and motor learning (Scheidtmann 2001, Floel 2005). This protocol aims to test the hypothesis that Carbidopa-Levodopa may enhance the beneficial effect of TBS on reaction times in patients with chronic stroke.


We plan to investigate 18 patients with motor impairment more than 6 months after ischemic stroke, and 10 healthy volunteers. Approval is sought for a total of 28 patients and 30 healthy volunteers to account for possible dropouts and pilot experiments (described below).


Each subject will be asked to participate in 4 sessions, at least a week apart. The experiment will test simple reaction times in the thumb or wrist of the paretic hand before and 7 minutes after either genuine or sham TBS. This will be followed by a measure of motor learning, using a well-characterized paradigm (Muellbacher 2001), which involves optimizing an externally paced ballistic thumb (or wrist) movement, and TMS measurement of corticospinal excitability. Performance of the learned task will be further assessed (and TMS measures made) at 2 hours, 1 day and 1 week following the training session. The experimental design for the four sessions will be 2x2 with TBS/sham and Carbidopa-Levodopa/placebo. For TBS, the patient will be given 3 minutes of either genuine or sham TBS to the hand representation of the motor cortex (Huang 2005). For Carbidopa-Levodopa/placebo, identical preparations from the NIH pharmacy will be given 1 hour beforehand. TBS has previously been used in 72 healthy subjects (7 studies) in Europe and in 10 patients with chronic stroke (2 studies) in the Lead Associate Investigator's lab in London. No side effects or seizures have been reported. Ten normal volunteers will be studied first to optimize experimental settings.


The primary outcome measure will be reaction times. Improvement in peak acceleration in the learning task will constitute a secondary measure. We expect to see improved reaction times with genuine TBS (vs. sham) and will look for an interaction whereby Carbidopa-Levodopa may enhance this effect (vs. placebo). This would suggest that synergy between dopaminergic modulation and TBS may show promise to produce clinical gains after stroke.

Study Type : Observational
Actual Enrollment : 20 participants
Official Title: Influencing Motor Performance in Patients With Stroke by Combined Theta Burst Stimulation and Carbidopa-Levodopa
Study Start Date : August 8, 2006
Study Completion Date : May 26, 2010

Resource links provided by the National Library of Medicine

Information from the National Library of Medicine

Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the contacts provided below. For general information, Learn About Clinical Studies.

Ages Eligible for Study:   18 Years to 90 Years   (Adult, Older Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No


  • Age 18 - 90
  • Ischemic cerebral infarction more than 6 months prior to testing not involving cortical motor areas
  • Initial severe paresis (MRC Grade 2 or less in hand muscles) with considerable motor recovery
  • Ability to make ballistic thumb abduction or wrist extension movements in the affected hand


  • Age 18 - 90
  • Right handed
  • Able to concentrate and to perform the tasks required



  • More than one ischemic stroke, or any hemorrhagic stroke
  • Large cortical stroke
  • Significant cognitive impairment, defined as a Mini Mental State Examination score of 23 or less
  • History of seizures or other neurological illness (except stroke)
  • History of alcohol or drug abuse
  • Inability to make necessary thumb abduction or wrist extension movements
  • Current or recent use of neuroleptic medication, tricyclic anti-depressants or monoamine oxidase inhibitors
  • History of narrow angle glaucoma
  • Contraindications to TMS - presence of cardiac pacemaker, intracardiac lines, implanted pumps or stimulators, or metal objects inside the eye or skull
  • Pregnancy (as the effects of TBS on the fetus are as yet unknown)
  • Uncontrolled medical (e.g. cardiovascular disease expressed as uncontrolled arrhythmias, shortness of breath, or overt signs of severe peripheral edema at the initial neurological exam, severe rheumatoid arthritis, arthritic joint deformity, active cancer or renal disease), or psychiatric problems (defined as having received medical treatment from a psychiatrist).


  • Contraindications to TMS (as above)
  • Pregnancy (see above)
  • History of seizures or other neurological illness
  • History of alcohol or drug abuse
  • History of depression / psychiatric illness requiring use of anti-psychotic drugs or anti-depressants
  • Current or recent use of neuroleptic medication, tricyclic anti-depressants or monoamine oxidase inhibitors
  • History of narrow angle glaucoma

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): NCT00366184

United States, Maryland
National Institutes of Health Clinical Center, 9000 Rockville Pike
Bethesda, Maryland, United States, 20892
Sponsors and Collaborators
National Institute of Neurological Disorders and Stroke (NINDS)

Publications: Identifier: NCT00366184     History of Changes
Other Study ID Numbers: 060225
First Posted: August 21, 2006    Key Record Dates
Last Update Posted: July 2, 2017
Last Verified: May 26, 2010

Keywords provided by National Institutes of Health Clinical Center (CC):
Motor Cortex
Motor Learning
Transcranial Magnetic Stimulation
Healthy Volunteer

Additional relevant MeSH terms:
Cerebrovascular Disorders
Brain Diseases
Central Nervous System Diseases
Nervous System Diseases
Vascular Diseases
Cardiovascular Diseases
Carbidopa, levodopa drug combination
Antiparkinson Agents
Anti-Dyskinesia Agents
Dopamine Agents
Neurotransmitter Agents
Molecular Mechanisms of Pharmacological Action
Physiological Effects of Drugs
Aromatic Amino Acid Decarboxylase Inhibitors
Enzyme Inhibitors
Adjuvants, Immunologic
Immunologic Factors
Dopamine Agonists