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Motor-evoked potential (MEP) changes from baseline presented as percentages (post intervention minus pre-intervention). A letter b indicates a significant difference between the melatonin+a-tDCS group and the melatonin+s-tDCS and placebo+s-tDCS groups (p < 0.05). All comparisons were performed using a mixed analysis of variance model, followed by the Bonferroni correction for multiple post hoc comparisons. tDCS = transcranial direct current stimulation.
