Rowers with disc degeneration may have motor control dysfunction during rowing. This study is aimed at clarifying the trunk and lower extremity muscle synergy during rowing and at comparing the muscle synergy between elite rowers with and without lumbar intervertebral disc degeneration. Twelve elite collegiate rowers (with disc degeneration, ; without disc degeneration, ) were included in this study. Midline sagittal images obtained by lumbar T2-weighted magnetic resonance imaging were used to evaluate disc degeneration. Participants with one or more degenerated discs were classified into the disc degeneration group. A 2000 m race trial using a rowing ergometer was conducted. Surface electrodes were attached to the right rectus abdominis, external oblique, internal oblique, latissimus dorsi, multifidus, erector spinae, rectus femoris, and biceps femoris. The activity of the muscles was measured during one stroke immediately after 20% and 80% of the rowing trial. Nonnegative matrix factorization was used to extract the muscle synergies from the electromyographic data. To compare the muscle synergies, a scalar product (SP) evaluating synergy coincidence was calculated, and the muscle synergies were considered identical at . Both groups had only one module in the 20% and 80% time points of the trial. At the 20% time point of the 2000 m rowing trial, the SP of the module was 99.8%. At the 80% time point, the SP of the module was 99.9%. The SP results indicate that, at 20% and 80% time points, both groups had the same module. The module showed a high contribution in all muscles. The activation coefficients indicated that the module was always highly activated throughout the rowing stroke in both groups. The trunk and lower extremity muscles are mobilized through the rowing stroke and maintain coordination during rowing. There was no difference in the muscle synergy between the rowers with and without lumbar intervertebral disc degeneration.

中文翻译：

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腰椎间盘退变不影响划船活动的肌肉协同作用

碟片变性的划船者在划船过程中可能会出现运动控制功能障碍。这项研究旨在阐明划船过程中的躯干和下肢肌肉协同作用，并比较有和没有腰椎间盘退变的精英赛艇运动员之间的肌肉协同作用。十二位精英大学赛艇运动员（椎间盘退变，; 没有椎间盘退变）被纳入这项研究。通过腰部T2加权磁共振成像获得的中线矢状图像用于评估椎间盘退变。具有一个或多个退化椎间盘的参与者被分类为椎间盘退化组。使用划船测力计进行了2000 m的比赛试验。表面电极连接到右腹直肌，外斜肌，内斜肌，背阔肌，多裂肌，竖脊肌，股直肌和股二头肌。在进行20％和80％的划船试验后立即测量一次中风的肌肉活动。非负矩阵分解用于从肌电图数据中提取肌肉协同作用。为了比较肌肉的协同效应，计算了评估协同效应一致性的标量乘积（SP），。两组在试验的20％和80％时间点中只有一个模块。在2000 m划船试验的20％时间点，模块的SP为99.8％。在80％的时间点，模块的SP为99.9％。SP结果表明，在20％和80％的时间点，两组的模块相同。该模块在所有肌肉中都表现出很高的贡献。激活系数表明，在两组划船行程中，模块始终被高度激活。划船时动员躯干和下肢肌肉，并在划船过程中保持协调。有和没有腰椎间盘退变的赛艇运动员之间的肌肉协同作用没有差异。