Mendez-Rebolledo Guillermo, Calatayud Joaquín, Martinez-Valdes Eduardo
Laboratorio de Investigación Somatosensorial y Motora, Escuela de Kinesiología, Facultad de Salud, Universidad Santo Tomás, Talca, CHILE.
Exercise Intervention for Health Research Group (EXINH-RG), Department of Physiotherapy, University of Valencia, Valencia, SPAIN.
Med Sci Sports Exerc. 2025 Jan 1;57(1):1-10. doi: 10.1249/MSS.0000000000003537.
This study aimed to determine whether individuals with chronic ankle instability (CAI) can activate the fibularis longus compartments with high-density surface electromyography (HD-sEMG) biofeedback to the same extent as those without CAI, and to analyze the effect of ankle position on compartment activation in individuals with CAI using HD-sEMG feedback.
There were 16 volunteers per group (CAI and No-CAI). The sEMG amplitude at each compartment (anterior and posterior) and the barycenter of the spatial sEMG amplitude distribution of the fibularis longus were recorded during eversion in neutral and plantar flexion positions at 30% and 70% of maximum voluntary contraction force, both with and without visual feedback on the spatial sEMG amplitude distribution.
sEMG amplitude of the posterior compartment of the fibularis longus in the CAI group trained with HD-sEMG feedback during eversion at 70% maximum voluntary contraction (in plantar flexion) was significantly higher than without HD-sEMG feedback (95% CI = 3.75-34.50% root mean square) and was similar to the activation of the No-CAI group (95% CI = -14.34% to 34.20% root mean square). Furthermore, individuals with CAI who underwent training with HD-sEMG feedback in plantar flexion exhibited a posterior displacement of the barycenter (95% CI = 0.56-2.84 mm).
Utilizing HD-sEMG feedback during eversion in plantar flexion position increases activation of the fibularis longus posterior compartment in individuals with CAI to the same extent as healthy people. HD-sEMG-based topographic maps can serve as effective feedback training to restore motor control of the ankle. Long-term efficacy for improving motor function requires investigation through longitudinal studies.
本研究旨在确定慢性踝关节不稳（CAI）个体能否通过高密度表面肌电图（HD-sEMG）生物反馈激活腓骨长肌各肌束，达到与无CAI个体相同的程度，并使用HD-sEMG反馈分析踝关节位置对CAI个体肌束激活的影响。
每组有16名志愿者（CAI组和非CAI组）。在最大自主收缩力的30%和70%时，于中立位和跖屈位进行外翻动作，记录每个肌束（前侧和后侧）的sEMG幅度以及腓骨长肌空间sEMG幅度分布的重心，记录时有无关于空间sEMG幅度分布的视觉反馈。
在最大自主收缩力的70%（跖屈位）进行外翻动作时，接受HD-sEMG反馈训练的CAI组腓骨长肌后侧肌束的sEMG幅度显著高于无HD-sEMG反馈时（95%可信区间 = 均方根的3.75 - 34.50%），且与非CAI组的激活程度相似（95%可信区间 = 均方根的 - 14.34%至34.20%）。此外，在跖屈位接受HD-sEMG反馈训练的CAI个体，其重心出现后移（95%可信区间 = 0.56 - 2.84 mm）。
在跖屈位外翻动作时利用HD-sEMG反馈，可使CAI个体腓骨长肌后侧肌束的激活程度提高到与健康人相同的水平。基于HD-sEMG的地形图可作为有效的反馈训练，以恢复踝关节的运动控制。改善运动功能的长期疗效需要通过纵向研究进行调查。
