European journal of applied physiology · 2025
Effects of running-induced fatigue on ankle plantar-dorsiflexion performance and functional connectivity in brain and brain-muscle networks.
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Zhan Jianglong, Yu Changxiao, Zhang Chuyi, Xiao Songlin, Shen Bin, Xu Zhen, Fu Weijie
Аннотация
PURPOSE: This study investigated the effects of running-induced fatigue on ankle plantar-dorsiflexion performance and explored the underlying neuromuscular control mechanisms.
METHODS: Twenty-four male participants performed a right-sided ankle plantar-dorsiflexion task before and after running-induced fatigue, with simultaneous recordings of ankle peak torque, electroencephalography signals from the primary motor cortex (M1; Cz, C1, C2) and other brain regions, and electromyography signals from the tibialis anterior (TA) and medial gastrocnemius (MG). Ankle peak torque was used to assess plantar-dorsiflexion performance. Beta- and gamma-band corticocortical coherence (CCC) was used to evaluate brain network connectivity, while partial directed coherence (PDC) was applied to analyze the brain-muscle network.
RESULTS: In the brain network, fatigue significantly reduced beta-band CCC for C1-Cz electrode pair (p = 0.022) during dorsiflexion, beta band for C2-Cz (p = 0.014), and gamma band for C1-Cz (p = 0.003) during plantarflexion. In the brain-muscle network, fatigue significantly decreased gamma-band PDC for TA-Cz (p = 0.007) during dorsiflexion and for MG-Cz (p = 0.010) during plantarflexion in the ascending pathway. The declines in ankle peak torques after fatigue were positively correlated with reduced gamma-band PDC in the ascending pathway (p < 0.034).
CONCLUSION: These findings suggest that running-induced fatigue significantly reduced functional connectivity within bilateral M1 regions and the ascending pathway of the brain-muscle network during unilateral ankle plantar-dorsiflexion, with weakened connectivity in the ascending pathway linked to decreased ankle force output.
METHODS: Twenty-four male participants performed a right-sided ankle plantar-dorsiflexion task before and after running-induced fatigue, with simultaneous recordings of ankle peak torque, electroencephalography signals from the primary motor cortex (M1; Cz, C1, C2) and other brain regions, and electromyography signals from the tibialis anterior (TA) and medial gastrocnemius (MG). Ankle peak torque was used to assess plantar-dorsiflexion performance. Beta- and gamma-band corticocortical coherence (CCC) was used to evaluate brain network connectivity, while partial directed coherence (PDC) was applied to analyze the brain-muscle network.
RESULTS: In the brain network, fatigue significantly reduced beta-band CCC for C1-Cz electrode pair (p = 0.022) during dorsiflexion, beta band for C2-Cz (p = 0.014), and gamma band for C1-Cz (p = 0.003) during plantarflexion. In the brain-muscle network, fatigue significantly decreased gamma-band PDC for TA-Cz (p = 0.007) during dorsiflexion and for MG-Cz (p = 0.010) during plantarflexion in the ascending pathway. The declines in ankle peak torques after fatigue were positively correlated with reduced gamma-band PDC in the ascending pathway (p < 0.034).
CONCLUSION: These findings suggest that running-induced fatigue significantly reduced functional connectivity within bilateral M1 regions and the ascending pathway of the brain-muscle network during unilateral ankle plantar-dorsiflexion, with weakened connectivity in the ascending pathway linked to decreased ankle force output.