Volume 3, Issue 4 (Summer 2012-- 2012)                   BCN 2012, 3(4): 28-35 | Back to browse issues page

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Jaberzadeh S, Bastani A, Kidgell D. Does the Longer Application of Anodal-Transcranial Direct Current Stimulation Increase Corticomotor Excitability Further? A Pilot Study . BCN 2012; 3 (4) :28-35
URL: http://bcn.iums.ac.ir/article-1-251-en.html


Introduction: Anodal transcranial direct current stimulation (a-tDCS) of the primary motor cortex (M1) has been shown to be effective in increasing corticomotor excitability.


Methods: We investigated whether longer applications of a-tDCS coincide with greater increases in corticomotor excitability compared to shorter application of a-tDCS. Ten right-handed healthy participants received one session of a-tDCS (1mA current) with shorter (10 min) and longer (10+10 min) stimulation durations applied to the left M1 of extensor carpi radialis muscle (ECR). Corticomotor excitability following application of a-tDCS was assessed at rest with transcranial magnetic stimulation (TMS) elicited motor evoked potentials (MEP) and compared with baseline data for each participant.


Results: MEP amplitudes were increased following 10 min of a-tDCS by 67% (p = 0.001) with a further increase (32%) after the second 10 min of a-tDCS (p = 0.005). MEP amplitudes remained elevated at 15 min post stimulation compared to baseline values by 65% (p = 0.02).


Discussion: The results demonstrate that longer application of a-tDCS within the recommended safety limits, increases corticomotor excitability with after effects of up to 15 minutes post stimulation.

Type of Study: Original | Subject: Cellular and molecular Neuroscience
Received: 2012/08/2 | Published: 2012/08/15

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