Sekine Chie, Matsunaga Naoto, Okubo Yu, Hangai Mika, Kaneoka Koji
Department of Physical Therapy, Niigata University of Health and Welfare, 1398 Shimami-cho, Kita-ku, Niigata City, Niigata 950-3198, Japan.
General Education Core Curriculum Division, Seigakuin University, 1-1 Tosaki, Ageo City, Saitama 362-8585, Japan.
Appl Bionics Biomech. 2021 Feb 15;2021:6651671. doi: 10.1155/2021/6651671. eCollection 2021.
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, = 6; without disc degeneration, = 6) 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 SP > 75%. 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.
患有椎间盘退变的赛艇运动员在赛艇运动过程中可能存在运动控制功能障碍。本研究旨在阐明赛艇运动过程中躯干和下肢肌肉的协同作用，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。本研究纳入了12名精英大学赛艇运动员（有椎间盘退变的6名；无椎间盘退变的6名）。通过腰椎T2加权磁共振成像获得的中线矢状面图像用于评估椎间盘退变。有一个或多个退变椎间盘的参与者被分类到椎间盘退变组。使用赛艇测功仪进行了2000米比赛试验。将表面电极附着在右侧腹直肌、腹外斜肌、腹内斜肌、背阔肌、多裂肌、竖脊肌、股直肌和股二头肌上。在赛艇试验的20%和80%之后紧接着的一个划桨周期内测量肌肉的活动。使用非负矩阵分解从肌电图数据中提取肌肉协同作用。为了比较肌肉协同作用，计算了评估协同作用一致性的标量积（SP），并且当SP>75%时认为肌肉协同作用相同。在试验的20%和80%时间点，两组均只有一个模块。在2000米赛艇试验的20%时间点，该模块的SP为99.8%。在80%时间点，该模块的SP为99.9%。SP结果表明，在20%和80%时间点，两组具有相同的模块。该模块在所有肌肉中均表现出高贡献率。激活系数表明，在两组的整个划桨过程中该模块始终高度激活。躯干和下肢肌肉通过划桨过程被调动起来，并在赛艇运动过程中保持协调。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。
