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The Effect of Different Intensities of Bilateral- and Cathodal-tDCS in Healthy Individuals

Healthy Clinical Trial

Official title:
The Effect of Different Intensities of Bilateral- and Cathodal-transcranial Direct Current Stimulation (tDCS) on Cortical Activity and Motor Performances in Healthy Individuals

Clinical Trial Summary

This study will be divided into 2 sub-study 1) To investigate the effects of 1 mA, 1.5 mA, and 2 mA of bilateral- tDCS on cortical activity and motor/cognitive performances in healthy individuals 2) To investigate the effects of 1 mA, 1.5 mA, and 2 mA of cathodal-tDCS on cortical activity and motor/cognitive performances in healthy individuals.

Clinical Trial Description

Transcranial direct current stimulation (tDCS) is one of the non-invasive brain stimulation (NIBS) techniques. It delivers weak direct current through the scalp via two electrodes. tDCS has been shown to modulate cortical excitability in polarity-specific effects; anodal increases cortical excitability, while cathodal decreases it. tDCS can be applied in two distinct montages: unilateral (an active electrode is applied over the cerebral cortex, while a reference electrode is applied over the contralateral orbit) and bilateral-tDCS (applying two electrodes simultaneously over both cerebral hemispheres). Many tDCS studies have been used as an add-on therapy in stroke patients which aimed to enhance motor re-learning after stroke. Anodal tDCS has been used to enhance cortical excitability in the lesioned hemisphere while cathodal tDCS is used to decrease it in the non-lesioned hemisphere and thus to rebalance the interhemispheric inhibition (IHI). However, there were recent studies reporting the reverse effect of cathodal-tDCS on cortical excitability at high doses. However, the effects of cathodal-tDCS among different doses on cortical excitability and on motor performance are still controversial no report of a non-linear effect for bilateral-tDCS. The present study will be investigated the effects of different intensities of unilateral cathodal tDCS and bilateral tDCS on cortical activity and functional outcomes in healthy individuals. A single session of different intensities of bilateral-tDCS or cathodal-tDCS (i.e., 1 mA, 1.5 mA, 2 mA vs. sham) will be combined with serial reaction time task (SRTT) in healthy individuals. Cortical activity will be measured as a primary outcome. All power bands (alpha, beta, delta, theta) will be analyzed. Moreover, analysis of brain activity will be also focused on both hemispheres. The reaction time of serial reaction time task and muscle strength will be served as the secondary outcome. Cortical activity and muscle strength will be evaluated before and after the intervention, while reaction time will be evaluated during and after the intervention. ;

Study Design

Related Conditions & MeSH terms

Clinical Trial Details
NCT number NCT05929014
Study type Interventional
Source Mahidol University
Contact
Status Completed
Phase N/A
Start date June 24, 2023
Completion date April 30, 2024
View Details
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