Mueller Juliane, Engel Tilman, Mueller Steffen, Kopinski Stephan, Baur Heiner, Mayer Frank
University Outpatient Clinic, Sports Medicine & Sports Orthopaedics, University of Potsdam, Germany.
University Outpatient Clinic, Sports Medicine & Sports Orthopaedics, University of Potsdam, Germany.
J Electromyogr Kinesiol. 2016 Oct;30:168-76. doi: 10.1016/j.jelekin.2016.07.005. Epub 2016 Jul 11.
The study aimed to analyse neuromuscular activity of the trunk comparing four different perturbations during gait. Thirteen subjects (28±3yrs) walked (1m/s) on a split-belt treadmill, while 4 (belt) perturbations (F1, F2, B1, B2) were randomly applied. Perturbations differed, related to treadmill belt translation, in direction (forward (F)/backward (B)) and amplitude (20m/s(2) (1)/40m/s(2) (2)). Trunk muscle activity was assessed with a 12-lead-EMG. EMG-RMS [%] (0-200ms after perturbation; normalized to RMS of normal gait) was analyzed for muscles and four trunk areas (ventral left/right; dorsal left/right). Ratio of ventral:dorsal muscles were calculated. Muscle onset [ms] was determined. Data analysis was conducted descriptively, followed by ANOVA (post hoc Tukey-Kramer (α=0.05)). All perturbations lead to an increase in EMG-RMS (428±289%). F1 showed the lowest and F2 the highest increase for the flexors. B2 showed the highest increase for the extensors. Significant differences between perturbations could be observed for 6 muscles, as well as the 4 trunk areas. Ratio analysis revealed no significant differences (range 1.25 (B1) to 1.71 (F2) between stimuli. Muscle response time (ventral: 87.0±21.7ms; dorsal: 88.4±17.0ms) between stimuli was only significant (p=0.005) for the dorsal muscles. Magnitude significantly influences neuromuscular trunk response patterns in healthy adults. Regardless of direction ventral muscles always revealed higher relative increase of activity while compensating the walking perturbations.
该研究旨在分析步态过程中躯干的神经肌肉活动，比较四种不同的扰动情况。13名受试者（28±3岁）在分体式跑步机上以1米/秒的速度行走，同时随机施加4种（皮带）扰动（F1、F2、B1、B2）。这些扰动在跑步机皮带平移方面有所不同，包括方向（向前（F）/向后（B））和幅度（20米/秒²（1）/40米/秒²（2））。使用12导联肌电图评估躯干肌肉活动。分析了扰动后0至200毫秒内肌肉和四个躯干区域（腹侧左/右；背侧左/右）的肌电图均方根值[％]（相对于正常步态的均方根值进行归一化）。计算腹侧与背侧肌肉的比率。确定肌肉起始时间[毫秒]。进行描述性数据分析，随后进行方差分析（事后Tukey-Kramer检验（α = 0.05））。所有扰动均导致肌电图均方根值增加（428±289％）。对于屈肌，F1增加最少，F2增加最多。对于伸肌，B2增加最多。在6块肌肉以及4个躯干区域中可观察到扰动之间的显著差异。比率分析显示刺激之间无显著差异（范围为1.25（B1）至1.71（F2））。刺激之间的肌肉反应时间（腹侧：87.0±21.7毫秒；背侧：88.4±17.0毫秒）仅在背侧肌肉中具有显著性（p = 0.005）。幅度显著影响健康成年人的神经肌肉躯干反应模式。无论方向如何，腹侧肌肉在补偿行走扰动时总是表现出更高的相对活动增加。
