Hemodynamic Response of Anodal Transcranial Direct Current Stimulation Over the Cerebellar Hemisphere in Healthy Subjects

Seoul National University

Status: Completed

Conditions: Stroke; Transcranial Direct Current Stimulation; Functional Near Infrared Spectroscopy

Treatments: Device: tDCS

Study type: Interventional

Funder types: Other

Identifiers

NCT04101695

B-1908-558-004

Details and patient eligibility

About

Upper extremity motor impairment is one of the major sequelae of stroke, resulting in limitation of activities of daily livings. Noninvasive neuromodulation is one of the therapies for motor recovery, which includes transcranial magnetic stimulation and transcranial direct current stimulation(tDCS). Anodal tDCS increases excitability and cathodal tDCS decreases excitability of neurons.

In systematic reviews, tDCS applied over primary motor cortex showed positive results on motor learning and improvements of hand fine motors. Recently, there has been trials of tDCS over cerebellum, considering the connectivity of primary motor cortex and cerebellum in motor controls. However, the results of these trials are yet contradictory, and the study using the functional near infrared spectroscopy to prove the effects of tDCS over distant area is lacking.

Therefore, in this study, we used functional near infrared spectroscopy (fNIRS) to observe the hemodynamic change of primary motor cortex when applying tDCS over cerebellum ascertain their connectivity.

In this crossover design, participants are randomly allocated to "sham tDCS-washout period-anodal tDCS group" or "anodal tDCS- washout period- sham tDCS group". The recording of fNIRS starts 3 minutes before the tDCS stimulation and continues throughout 20 minutes of stimulation, until 30 minutes after the stimulation cessation. After 7 days of washout period, second recording is done as the same protocol. Outcome measures are the changes of concentration of deoxyhemoglobin [deoxy-Hb] and oxyhemoglobin [oxy-Hb].

Enrollment: 16 patients

Sex: All

Ages: 19+ years old

Volunteers: Accepts Healthy Volunteers

Inclusion criteria

• Age: 19 years or older
• No known brain disorders

Exclusion criteria

• Uncontrolled or unstalbe medical condition
• Pregnant
• Scalp problem which interferese with tDCS
• metals in the head (example: clip, coil), cochlear implants

Trial design

Primary purpose: Treatment

Allocation: Randomized

Interventional model: Crossover Assignment

Masking: Quadruple Blind

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16 participants in 2 patient groups

sham tDCS- washout period- anodal tDCS

Active Comparator group

Description:

Ybrain tDCS System (Ybrain, Korea) is used. Anode of tDCS is placed over right cerebellar hemisphere (3cm lateral from the occipital protuberance) and cathode over the on ipsilateral buccinator muscle. For Sham tDCS, total stimulation lasts 90 seconds: ramp up period of 30 seconds, stimultation for intensity of 2mA for 30 seconds, and ramp down period of 30 seconds. At least 7 days of washout period is in between two tDCS. For Anodal tDCS, 20 minutes of stimulation for intensity of 2mA.

Treatment:

Device: tDCS

anodal tDCS- washout period- sham tDCS

Active Comparator group

Description:

Ybrain tDCS System (Ybrain, Korea) is used. Anode of tDCS is placed over right cerebellar hemisphere (3cm lateral from the occipital protuberance) and cathode over the on ipsilateral buccinator muscle. For Anodal tDCS, 20 minutes of stimulation for intensity of 2mA. At least 7 days of washout period is in between two tDCS. For Sham tDCS, total stimulation lasts 90 seconds: ramp up period of 30 seconds, stimultation for intensity of 2mA for 30 seconds, and ramp down period of 30 seconds.

Treatment:

Device: tDCS