Key Laboratory of Exercise and Health Sciences of Ministry of Education, Shanghai University of Sport, Shanghai 200438, China.
Faculty of Sport Science, Ningbo University, Ningbo 315211, China.
Cereb Cortex. 2023 Jun 8;33(12):7670-7677. doi: 10.1093/cercor/bhad070.
This study aimed to investigate the cortical responses to the ankle force control and the mechanism underlying changes in ankle force control task induced by transcranial direct current stimulation (tDCS). Sixteen young adults were recruited, and they completed the electroencephalogram (EEG) assessment and high-definition tDCS (HD-tDCS) sessions. Root mean square (RMS) error was used to evaluate ankle force control task performance. Spectral power analysis was conducted to extract the average power spectral density (PSD) in the alpha (8-13 Hz) and beta (13-30 Hz) bands for resting state and tasking (i.e. task-PSD). The ankle force control task induced significant decreases in alpha and beta PSDs in the central, left, and right primary sensorimotor cortex (SM1) and beta PSD in the central frontal as compared with the resting state. HD-tDCS significantly decreased the RMS and beta task-PSD in the central frontal and SM1. A significant association between the percent change of RMS and the percent change of beta task-PSD in the central SM1 after HD-tDCS was observed. In conclusion, ankle force control task activated a distributed cortical network mainly including the SM1. HD-tDCS applied over SM1 could enhance ankle force control and modulate the beta-band activity of the sensorimotor cortex.
本研究旨在探究踝部力控制的皮质反应以及经颅直流电刺激（tDCS）改变踝部力控制任务的机制。招募了 16 名年轻成年人，他们完成了脑电图（EEG）评估和高清晰度 tDCS（HD-tDCS）疗程。均方根误差（RMS）用于评估踝部力控制任务的表现。对静息状态和任务状态（即任务 PSD）进行频谱功率分析，以提取 alpha（8-13 Hz）和 beta（13-30 Hz）频段的平均功率谱密度（PSD）。与静息状态相比，踝部力控制任务会导致中央、左侧和右侧初级感觉运动皮层（SM1）的 alpha 和 beta PSD 以及中央额区的 beta PSD 显著降低。HD-tDCS 显著降低了中央额区和 SM1 的 RMS 和 beta 任务 PSD。在 HD-tDCS 后，中央 SM1 中的 RMS 和 beta 任务 PSD 的百分比变化之间存在显著关联。总之，踝部力控制任务激活了一个分布式皮质网络，主要包括 SM1。应用于 SM1 的 HD-tDCS 可以增强踝部力控制并调节感觉运动皮层的 beta 波段活动。
