Effects of frequency-modulated temporal interference electrical fields stimulation on muscle strength and neuromuscular recruitment ability
10.3969/j.issn.1000-6710.2025.09.001
- VernacularTitle:变频相位干涉电场刺激对肌肉力量和神经肌肉募集能力的影响
- Author:
Zhining ZHOU
1
;
Yun CHEN
;
Jiaojiao LÜ
Author Information
1. 上海体育大学运动健康学院(上海 200438)
- Publication Type:Journal Article
- Keywords:
transcranial electrical stimulation;
primary motor cortex;
muscular strength;
motor unit recruitment;
electromyogram
- From:
Chinese Journal of Sports Medicine
2025;44(9):691-697
- CountryChina
- Language:Chinese
-
Abstract:
Objective To explore the effect of frequency-modulated temporal interference electrical fields stimulation(TIs)on muscle strength and neuromuscular recruitment ability.Methods Sixteen healthy adult participants completed two testing sessions,with an interval of no less than 48 hours be-tween them.The only difference between them was the intervention of real TIs versus sham stimula-tion.The stimulation targeted the left primary motor cortex.During the test,the 3-second maximal vol-untary contraction(3 s MVC)of the first dorsal interosseous(FDI)muscle and the 20-second one(20 s MVC)in the right hand were recorded.Meanwhile,the surface electromyography(sEMG)sig-nals were recorded during the 20 s MVC and analyzed using sEMG decomposition techniques.Results A significant interaction effect was observed in peak muscle force during the 3 s MVC(P<0.05).Com-pared to baseline,real TIs significantly increased peak force,whereas the sham stimulation resulted in a decrease.Moreover,a significant interaction was also found in the peak EMG amplitude during the 20 s MVC(P<0.05),with peak EMG amplitude increasing after real TIs but decreasing after sham stimulation.Conclusion Frequency-modulated TIs effectively enhances peak muscle strength dur-ing the 3 s MVC and increases motor unit synchronization firing during the 20 s MVC.Therefore,TIs has potential for improving neuromuscular performance.
