Changes of muscle activation during landing impact of human lower limbs during accumulation of running fa-tigue
10.3969/j.issn.1006-9771.2024.10.012
- VernacularTitle:跑步疲劳进程中人体下肢着地冲击时的肌肉激活变化特征
- Author:
Qian WU
1
;
Mengli WEI
;
Sijia CAO
;
Tingting YU
;
Yaping ZHONG
Author Information
1. 武汉体育学院运动训练学院,湖北 武汉市 430079
- Keywords:
running;
exercise fatigue;
surface electromyography;
neuromuscular control
- From:
Chinese Journal of Rehabilitation Theory and Practice
2024;30(10):1215-1223
- CountryChina
- Language:Chinese
-
Abstract:
Objective To investigate changes of muscle activation in the lower limbs during landing impact as running fatigue pro-gresses. Methods From November to December,2022,eleven male runners were recruited from Wuhan Sports University.They performed a steady-state run at 75%of their maximum heart rate and continued until Borg rating score≥17 or 90%of their maximum heart rate.Muscle activity data were collected using a Delsys wireless surface electromy-ography system,continuously recording the EMG of the quadriceps(vastus medialis,rectus femoris,vastus later-alis),hamstrings(biceps femoris,semitendinosus),gluteus maximus,lateral head of the gastrocnemius and tibia-lis anterior.The pre-activation,post-activation and co-activation characteristics of these lower limb muscles were analyzed. Results With fatigue accumulation during running,significant differences were observed in the pre-activation level of the tibialis anterior among different fatigue points(F=2.955,P=0.048),with the 100%fatigue point showing significantly higher pre-activation levels than the start(P=0.010);as well as post-activation levels of quadriceps(F=6.609,P=0.001),with higher levels at the 100%point compared to the start(P=0.011),33%(P=0.009)and 67%(P=0.043)fatigue points;co-activation ratios of ankle joint during the pre-activation phase(F=3.287,P=0.034),with a significantly higher co-activation ratio at the 100%fatigue point compared to the start(P=0.023). Conclusion As running fatigue accumulates,the central nervous system adjusts the activation levels of various lower limb muscles to modify impact posture,reducing the risk of injury from accumulated lower limb loads.
