Effect of Transcranial Direct Current Stimulation of Primary Motor Cortex on Lower-limb Muscle Strength and Gait in Healthy Young Individuals

Abstract

[Purpose] To clarify the effect of transcranial direct current stimulation (tDCS) on lower-limb muscle strength and gait. [Participants and Methods] Sixteen healthy young males performed the same motor task under two conditions: sham tDCS and anodal tDCS. For both conditions, measurement of maximal isometric strength during closed kinetic chain (CKC) extension of the right lower limb and gait analysis were subsequently conducted. [Results] The isometric strength during CKC extension of the right lower limb was significantly greater after anodal tDCS compared to sham tDCS. Gait analysis revealed no significant differences in any of the analyzed parameters. [Conclusion] tDCS applied to the primary motor cortex may promote cortical excitability more effectively when combined with voluntary motor tasks.