Effects of exercise-induced fatigue on the functional connectivity of the primary motor cortex during unilateral ankle plantar-dorsiflexion
10.3969/j.issn.1000-6710.2025.09.002
- VernacularTitle:运动性疲劳对单侧踝关节跖-背屈时大脑初级运动皮层功能连接的影响
- Author:
Jianglong ZHAN
1
;
Changxiao YU
;
Songlin XIAO
;
Bin SHEN
;
Chuyi ZHANG
;
Zhen XU
;
Weijie FU
Author Information
1. 上海体育大学运动健康学院(上海 200438)
- Publication Type:Journal Article
- Keywords:
exercise-induced fatigue;
coherence analysis;
primary motor cortex;
motor control;
func-tional connectivity
- From:
Chinese Journal of Sports Medicine
2025;44(9):698-703
- CountryChina
- Language:Chinese
-
Abstract:
Objective To explore the effect of exercise-induced fatigue on intra-and interhemispher-ic functional connectivity of the primary motor cortex during unilateral ankle plantar-dorsiflexion.Meth-ods Twenty-four healthy adult males(age:21.6±2.2 years;all right-side dominant)were selected as participants for the study.They ran on a treadmill at an individualized constant speed until fatigue.Fatigue was determined when all the following criteria were met:(1)participants failing to maintain the individualized constant speed despite the strong verbal encouragement from the experimenters;(2)reaching a rating of perceived exertion(RPE)score of at least 19;and(3)their heart rate reaching 90%of their age-predicted maximal heart rate(220-age).Moreover,EEG signals from four channels(C1,C2,C3,and C4)of the primary motor cortex were collected during unilateral ankle dorsi-plan-tarflexion movements before and after fatigue,followed by EEG coherence analyses on the collected da-ta.Results Compared to the pre-fatigue state,the coherence values of the intra-hemispheric primary motor cortex electrode pairs C1-C3 and C2-C4 during unilateral ankle plantar-dorsiflexion decreased significantly in the alpha and gamma bands after fatigue(both P<0.05).Conversely,the value of the interhemispheric primary motor cortex electrode pair C1-C2 increased significantly in the beta band(P<0.05).Conclusion Exercise-induced fatigue significantly weakens the intra-hemispheric functional con-nectivity of the primary motor cortex during unilateral ankle plantar-dorsiflexion.However,it may en-hance the interhemispheric functional connectivity and potentially collaborate to strengthen the regula-tion of fatigued muscles.
