Sport and Health Research Center, Physical Education Department, Tongji University, Shanghai, China.
School of Kinesiology, Shanghai University of Sport, Shanghai, China.
J Healthc Eng. 2017;2017:8121976. doi: 10.1155/2017/8121976. Epub 2017 Jul 31.
To investigate the cortico-cortical coupling changes related to antagonist muscle prefatigue, we recorded EEG at FC3, C3, FC4, and C4 electrodes of twelve young male volunteers during a 30-second-long, nonfatiguing isometric elbow extension contraction with a target force level of 20% MVC before and after a sustained fatiguing elbow flexion contraction until task failure. EEG-EEG phase synchronization indices in alpha and beta frequency bands were calculated for the pre- and postfatigue elbow extension contractions. The phase synchronization index in the beta frequency band was found significantly increased between EEG of FC3-C3. The increased phase synchronization index may reflect an enhanced intracortical communication or integration of the signals between contralateral motor cortices with antagonist muscle prefatigue, which may be related to the central modulation so as to compensate for the antagonist muscle prefatigue-induced joint instability.
为了研究与拮抗肌预疲劳相关的皮质间耦合变化，我们在 12 名年轻男性志愿者进行 30 秒非疲劳性等长肘伸收缩时，在 FC3、C3、FC4 和 C4 电极记录脑电图，目标力水平为 20% MVC，在持续疲劳性肘屈收缩前后，直至任务失败。在疲劳前后的肘伸收缩期间，计算了 alpha 和 beta 频带中的 EEG-EEG 相位同步指数。在 FC3-C3 之间的 beta 频带中发现相位同步指数显著增加。增加的相位同步指数可能反映了拮抗肌预疲劳时双侧运动皮质之间信号的皮层内通讯或整合增强，这可能与中枢调节有关，以便补偿拮抗肌预疲劳引起的关节不稳定。
