PDF(Pubmed)
Abstract：
We aimed to assess high-density surface electromyography (HDsEMG)-torque relationships in the presence of delayed onset trunk muscle soreness (DOMS) and the effect of these relationships on torque steadiness (TS) and lumbar movement during concentric/eccentric submaximal trunk extension contractions. Twenty healthy individuals attended three laboratory sessions (24 h apart). HDsEMG signals were recorded unilaterally from the thoracolumbar erector spinae with two 64-electrode grids. HDsEMG-torque signal relationships were explored via coherence (0-5 Hz) and cross-correlation analyses. Principal component analysis was used for HDsEMG-data dimensionality reduction and improvement of HDsEMG-torque-based estimations. DOMS did not reduce either concentric or eccentric trunk extensor muscle strength. However, in the presence of DOMS, improved TS, alongside an altered HDsEMG-torque relationship and kinematic changes were observed, in a contraction-dependent manner. For eccentric trunk extension, improved TS was observed, with greater lumbar flexion movement and a reduction in δ-band HDsEMG-torque coherence and cross-correlation. For concentric trunk extensions, TS improvements were observed alongside reduced thoracolumbar sagittal movement. DOMS does not seem to impair the ability to control trunk muscle force, however, perceived soreness induced changes in lumbar movement and muscle recruitment strategies, which could alter motor performance if the exposure to pain is maintained in the long term.
摘要：
我们旨在评估在存在延迟性躯干肌肉酸痛（DOMS）的情况下的高密度表面肌电图（HDsEMG）-扭矩关系，以及这些关系对同心/偏心亚最大躯干伸展收缩期间扭矩稳定性（TS）和腰椎运动的影响。20名健康人参加了3次实验室会议（间隔24小时）。用两个64电极网格从胸腰椎竖脊肌单侧记录HDsEMG信号。通过相干性（0-5Hz）和互相关分析探索了HDsEMG-扭矩信号关系。主成分分析用于HDsEMG数据降维和基于HDsEMG扭矩的估计的改进。DOMS不会降低同心或偏心的躯干伸肌力量。然而,在DOMS面前,改进的TS,观察到HDsEMG-扭矩关系和运动学变化，以收缩依赖的方式。对于偏心行李箱延伸，观察到改善的TS，腰椎屈曲运动更大，δ波段HDsEMG-扭矩相干性和互相关减少。对于同心树干延伸，观察到TS改善以及胸腰椎矢状运动减少。DOMS似乎没有削弱控制躯干肌肉力量的能力，然而,感觉到的疼痛引起的腰椎运动和肌肉募集策略的变化，如果长期维持疼痛，这可能会改变运动性能。
