Changes of muscle synergy mode of human lower limbs during the fatigue running
10.3969/j.issn.1001-1242.2024.09.008
- VernacularTitle:跑步疲劳进程中人体下肢肌肉协同模式变化
- Author:
Mengli WEI
1
;
Yaping ZHONG
;
Qian WU
Author Information
1. 武汉体育学院体育大数据研究中心,湖北省武汉市,430070
- Keywords:
running;
exercise fatigue;
surface electromyography;
neuromuscular control
- From:
Chinese Journal of Rehabilitation Medicine
2024;39(9):1295-1303,1315
- CountryChina
- Language:Chinese
-
Abstract:
Objective:To explore the changes in the synergy mode of human lower limb muscles during the fatigue run-ning,in order to reveal the mechanism by which the central system regulates lower limb movement to adapt to fatigue accumulation. Method:Eleven male runners received constant speed running fatigue intervention,and the electromyograph-ic data of the lower limb muscles was collected during the whole intervention process.The non-negative ma-trix factorization algorithm was used to extract analysis indicators such as the number of lower limb muscle synergists,the peak activation time of muscle synergists,and the muscle relative weight at different interven-tion times. Result:A total of six types of muscle synergists were analyzed throughout the entire process of running fa-tigue intervention to dominate human lower limb joint activities,but each subject would only randomly mobi-lize four to five of them at different fatigue moments,and the number of muscle synergists participating in each fatigue moment had no significant change(P>0.05).The peak activation time of synergy 1 decreased sig-nificantly at 33%、100%time(P<0.05).The relative weight of semitendinosus of synergy 1 was significantly reduced at 33%、67%and 100%time(P<0.05).The relative weight of rectus femoris of synergy 2 decreased significantly at 33%time(P<0.05).The relative weight of biceps femoris of synergy 4 decreased significantly at 67%time(P<0.05),but increased significantly at 100%time(P<0.05). Conclusion:In the process of running fatigue,the human central system will regulate the muscle synergy mode of lower limbs to adapt to fatigue accumulation and reduce the risk of lower limb injury.The specific performance of this regulation process includes:stabilizing the number of lower limb muscle synergists in-volved,reducing the peak activation time of muscle synergists in the early stance stage,dynamically adjusting the relative weight of rectus femoris and semitendinosus in the early stance stage and biceps femoris in the middle swing stage.