Yu Changxiao, Zhan Jianglong, Xu Linfeng, Zhou Junhong, Fu Weijie
School of Rehabilitation Science, Hangzhou Medical College, Hangzhou, 310000, China.
Key Laboratory of Exercise and Health Sciences of Ministry of Education, School of Exercise and Health, Shanghai University of Sport, Shanghai, 200438, China.
Eur J Appl Physiol. 2025 Feb 5. doi: 10.1007/s00421-025-05714-4.
Exercise-induced fatigue can reduce motor control performance and increase the risk of sporting injuries, which are related to functional coupling within the corticomotoneuronal pathway. However, the differences in functional coupling caused by general and local muscular exercise-induced fatigue are unknown. This study aimed to investigate the effects of exercise-induced fatigue on the beta-band (16-30 Hz) functional coupling between the sensorimotor cortex (SM1) and muscles of the dominant lower limb under different fatigue protocols.
Twenty-four healthy male participants were recruited to participate in randomized sessions of personalized constant speed running as general muscular exercise (GME) and maximum isokinetic ankle plantar-dorsiflexion as local muscular exercise (LME) to induce fatigue. These sessions were separated by 7 days. The electroencephalogram (EEG) signals of SM1 (e.g., FC1, FCz, and Cz) and surface electromyography signals (sEMG) of four muscles (soleus, SOL; medial gastrocnemius, MG; later gastrocnemius, and LG; tibialis anterior, TA) were simultaneously recorded before and after fatigue during the ankle plantar-dorsiflexion task, which were used for beta-band coherence analyses.
Following fatigue induced by GME, the EEG-sEMG coherence was significantly greater than that induced by LME (P < 0.04). Compared to pre-fatigue state, the coherence of FC1-SOL, FCz-SOL, and Cz-SOL increased significantly after general fatigue, while these coherences decreased significantly after local fatigue.
Fatigue induced by GME indicates an enhancement in beta-band functional coupling between the SM1 and muscles of the dominant lower limb, which is related to higher motor control performance. In contrast, fatigue induced by LME diminishes the functional coupling.
运动诱导的疲劳会降低运动控制能力，并增加运动损伤风险，这与皮质脊髓运动神经元通路内的功能耦合有关。然而，全身性和局部性肌肉运动诱导的疲劳所导致的功能耦合差异尚不清楚。本研究旨在探讨在不同疲劳方案下，运动诱导的疲劳对感觉运动皮层（SM1）与优势下肢肌肉之间β波段（16 - 30赫兹）功能耦合的影响。
招募24名健康男性参与者，参加个性化恒速跑步作为全身性肌肉运动（GME）和最大等速踝关节跖屈 - 背屈作为局部性肌肉运动（LME）以诱导疲劳的随机实验。这些实验之间间隔7天。在踝关节跖屈 - 背屈任务期间，在疲劳前后同时记录SM1的脑电图（EEG）信号（例如，FC1、FCz和Cz）以及四块肌肉（比目鱼肌，SOL；内侧腓肠肌，MG；外侧腓肠肌，LG；胫骨前肌，TA）的表面肌电图信号（sEMG），用于β波段相干分析。
GME诱导疲劳后，EEG - sEMG相干性显著高于LME诱导疲劳后（P < 0.04）。与疲劳前状态相比，全身性疲劳后FC1 - SOL、FCz - SOL和Cz - SOL的相干性显著增加，而局部性疲劳后这些相干性显著降低。
GME诱导的疲劳表明SM1与优势下肢肌肉之间的β波段功能耦合增强，这与更高的运动控制能力有关。相比之下，LME诱导的疲劳会减弱功能耦合。
