TMS-EEG as a Tool to Study the Neuromodulatory Effects of Theta Burst Stimulation

Study Results

Results pending

The study team has not published outcome measurements, participant flow, or safety data for this trial yet. Check back later for updates.

Basic Information

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Recruitment Status

COMPLETED

Clinical Phase

NA

Total Enrollment

15 participants

Study Classification

INTERVENTIONAL

Study Start Date

2017-08-02

Study Completion Date

2017-11-13

Brief Summary

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To assess the effect of continuous (cTBS) and intermittent theta burst stimulation (iTBS) stimulation on motor cortex excitability using TMS-EEG. Based on prior literature, the investigators hypothesized that N100 amplitude would be differently modulated by these two modalities.

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Detailed Description

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Each participant underwent three experimental sessions, at least one week apart in a cross-over design, assessing the effects of a single TBS train over the motor cortex on TMS-evoked potentials measured at the same location and resting-state EEG, immediately before and after the intervention. At each session a different type of TBS was applied (cTBS, iTBS or sham) in a randomized sequence. Subjects were uninformed about the expected effects of each intervention. Sham stimulation was achieved by adding a plastic spacer (25mm thickness) between coil and scalp, preventing effective cortical stimulation.

Conditions

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Cortical Excitability

Study Design

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Allocation Method

RANDOMIZED

Intervention Model

CROSSOVER

three experimental sessions at randomized order, at least one week apart, in a cross-over design

Primary Study Purpose

DIAGNOSTIC

Blinding Strategy

DOUBLE

Participants Outcome Assessors

Study Groups

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continuous theta burst stimulation

cTBS over the left motor hotspot, delivered at 80% of resting motor threshold (RMT), according to the Huang et al. protocol, consisting of bursts of stimuli that are presented every 200ms (5Hz), with bursts consisting of 3 stimuli at 50 Hz. A total of 600 pulses are delivered in a continuous train of 40s.

Group Type ACTIVE_COMPARATOR

theta burst stimulation

Intervention Type DEVICE

TBS over the left motor hotspot, delivered at 80% of resting motor threshold (RMT), according to the Huang et al. protocol, consisting of bursts of stimuli that are presented every 200ms (5Hz), with bursts consisting of 3 stimuli at 50 Hz. A total of 600 pulses are delivered.

intermittent theta burst stimulation

iTBS over the left motor hotspot, delivered at 80% of resting motor threshold (RMT), according to the Huang et al. protocol, consisting of bursts of stimuli that are presented every 200ms (5Hz), with bursts consisting of 3 stimuli at 50 Hz. A total of 600 pulses are delivered in an intermittent train of 190s for iTBS, with repeated cycles of 2s stimulation and 8s pause.

Group Type ACTIVE_COMPARATOR

theta burst stimulation

Intervention Type DEVICE

TBS over the left motor hotspot, delivered at 80% of resting motor threshold (RMT), according to the Huang et al. protocol, consisting of bursts of stimuli that are presented every 200ms (5Hz), with bursts consisting of 3 stimuli at 50 Hz. A total of 600 pulses are delivered.

sham stimulation

Sham stimulation over the left motor hotspot, delivered at 80% of resting motor threshold (RMT), according to the Huang et al. protocol, consisting of bursts of stimuli that are presented every 200ms (5Hz), with bursts consisting of 3 stimuli at 50 Hz. A total of 600 pulses are delivered in a continuous train of 40s using a plastic spacer (25mm thickness) between coil and scalp, preventing effective cortical stimulation.

Group Type SHAM_COMPARATOR

theta burst stimulation

Intervention Type DEVICE

TBS over the left motor hotspot, delivered at 80% of resting motor threshold (RMT), according to the Huang et al. protocol, consisting of bursts of stimuli that are presented every 200ms (5Hz), with bursts consisting of 3 stimuli at 50 Hz. A total of 600 pulses are delivered.

Interventions

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theta burst stimulation

TBS over the left motor hotspot, delivered at 80% of resting motor threshold (RMT), according to the Huang et al. protocol, consisting of bursts of stimuli that are presented every 200ms (5Hz), with bursts consisting of 3 stimuli at 50 Hz. A total of 600 pulses are delivered.

Intervention Type DEVICE

Eligibility Criteria

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Inclusion Criteria

* Age 18-65 years
* Male
* Right handed subjects
* IQ \> 70
* Healthy participants, as determined by history, clinical investigation and investigator's judgment
* No history of central nervous system condition
* No chronic intake of neurotropic drugs
* TMS Safety Screening questionnaire and informed consent signed

Exclusion Criteria

* Pregnancy, short-term birth wish or childbearing age without adequate birth control
* Intracranial metal hardware (excluding dental filling): surgical clips, shrapnell, electrodes under the stimulation area
* Presence of pacemaker, implantable cardioverter-defibrillator (ICD), permanent medication pumps, cochlear implants or deep brain stimulation (DBS)

Minimum Eligible Age

18 Years

Maximum Eligible Age

65 Years

Eligible Sex

MALE

Accepts Healthy Volunteers

Yes