Jaberzadeh Shapour, Malekahmad Mona, Liu Renming, Zoghi Maryam
Monash Neuromodulation Research Unit, Department of Physiotherapy, Monash University, Melbourne, Victoria, Australia.
Discipline of Physiotherapy, Federation University, Churchill, Victoria, Australia.
Psychophysiology. 2025 Jul;62(7):e70112. doi: 10.1111/psyp.70112.
The effects of 400 Hz anodal and cathodal transcranial pulsed current stimulation of the primary motor cortex (400 Hz a-tPCS, 400 Hz c-tPCS) on corticospinal excitability (CSE) and corticocortical excitability (CCE) and hand dexterity remain underexplored. This study examined the effects of a single session of 400 Hz a-tPCS, 400 Hz c-tPCS, and sham stimulation on CSE, CCE, and hand dexterity, providing insights for potential clinical applications in motor deficits. In this double-blinded, randomized, counterbalanced crossover trial, 26 healthy young adults completed three experimental sessions: 400 Hz a-tPCS, 400 Hz c-tPCS, and sham stimulation, spaced 48 h apart. Transcranial magnetic stimulation assessed CSE and CCE, while the Purdue Pegboard Test (PPT) evaluated hand dexterity. The results showed polarity-specific effects. A single session of 400 Hz a-tPCS significantly increased CSE and improved hand dexterity, evidenced by faster PPT completion times (p < 0.05). Conversely, 400 Hz c-tPCS reduced CSE but did not influence PPT performance (p > 0.05). Sham stimulation showed no significant changes. These findings suggest that 400 Hz a-tPCS enhances motor excitability and dexterity, while 400 Hz c-tPCS selectively reduces CSE. This study lays a foundation for exploring high-frequency tPCS in clinical motor rehabilitation.
400赫兹阳极和阴极经颅脉冲电流刺激初级运动皮层(400赫兹阳极经颅脉冲电流刺激、400赫兹阴极经颅脉冲电流刺激)对皮质脊髓兴奋性(CSE)、皮质皮质兴奋性(CCE)和手部灵活性的影响仍未得到充分研究。本研究考察了单次400赫兹阳极经颅脉冲电流刺激、400赫兹阴极经颅脉冲电流刺激和假刺激对CSE、CCE和手部灵活性的影响,为运动功能障碍的潜在临床应用提供见解。在这项双盲、随机、平衡交叉试验中,26名健康年轻成年人完成了三个实验阶段:400赫兹阳极经颅脉冲电流刺激、400赫兹阴极经颅脉冲电流刺激和假刺激,间隔48小时。经颅磁刺激评估CSE和CCE,而普渡钉板试验(PPT)评估手部灵活性。结果显示出极性特异性效应。单次400赫兹阳极经颅脉冲电流刺激显著提高了CSE并改善了手部灵活性,PPT完成时间更快证明了这一点(p<0.05)。相反,400赫兹阴极经颅脉冲电流刺激降低了CSE,但未影响PPT表现(p>0.05)。假刺激没有显著变化。这些发现表明,400赫兹阳极经颅脉冲电流刺激可增强运动兴奋性和灵活性,而400赫兹阴极经颅脉冲电流刺激可选择性降低CSE。本研究为在临床运动康复中探索高频经颅脉冲电流刺激奠定了基础。
Biomedicines. 2023-1-30