Anodal tDCS Over the Left Prefrontal Cortex Does Not Cause Clinically Significant Changes in Circulating Metabolites

Area of Science:

• Neuroscience
• Metabolomics
• Neuromodulation

Background:

• Transcranial direct current stimulation (tDCS) is explored for depression treatment.
• Potential impact of tDCS on peripheral metabolism is suggested.
• Limited data exists on tDCS effects on circulating metabolites.

Purpose of the Study:

• To investigate if five daily tDCS sessions modulate peripheral metabolites in healthy adult males.
• To assess changes in serum metabolite levels following tDCS or sham stimulation.

Main Methods:

• Double-blind, randomized controlled trial with 79 healthy males.
• Anodal tDCS (2 mA) applied to the left dorsolateral prefrontal cortex.
• Serum samples collected pre-stimulation, post-first, and post-fifth sessions; 102 metabolites analyzed via mass spectrometry.

Main Results:

• tDCS-related variations in serum metabolite levels were minimal and not statistically significant.
• Power calculations indicated extremely large sample sizes (up to 11,000 per group) needed to detect significance.
• No major modulations in peripheral metabolites were observed.

Conclusions:

• Five sessions of tDCS showed no significant effects on peripheral metabolites in healthy men.
• Findings suggest tDCS is a safe intervention with no substantial impact on measured peripheral metabolites.
• Supports tDCS as a potentially safe neuromodulation technique.