Mueller Juliane, Hadzic Miralem, Mugele Hendrik, Stoll Josefine, Mueller Steffen, Mayer Frank
University Outpatient Clinic, Sports Medicine & Orthopaedics, University of Potsdam, Germany.
University Outpatient Clinic, Sports Medicine & Orthopaedics, University of Potsdam, Germany.
J Biomech. 2018 Mar 21;70:212-218. doi: 10.1016/j.jbiomech.2017.12.013. Epub 2017 Dec 15.
Core-specific sensorimotor exercises are proven to enhance neuromuscular activity of the trunk. However, the influence of high-intensity perturbations on training efficiency is unclear within this context. Sixteen participants (29±2yrs; 175±8cm; 69±13kg) were prepared with a 12-lead bilateral trunk EMG. Warm-up on a dynamometer was followed by maximum voluntary isometric trunk (flex/ext) contraction (MVC). Next, participants performed four conditions for a one-legged stance with hip abduction on a stable surface (HA) repeated randomly on an unstable surface (HAP), on a stable surface with perturbation (HA+P), and on an unstable surface with perturbation (HAP+P). Afterwards, bird dog (BD) was performed under the same conditions (BD, BDP, BD+P, BDP+P). A foam pad under the foot (HA) or the knee (BD) was used as an unstable surface. Exercises were conducted on a moveable platform. Perturbations (ACC 50m/sec;100ms duration;10rep.) were randomly applied in the anterior-posterior direction. The root mean square (RMS) normalized to MVC (%) was calculated (whole movement cycle). Muscles were grouped into ventral right and left (VR;VL), and dorsal right and left (DR;DL). Ventral-Dorsal and right-left ratios were calculated (two way repeated-measures ANOVA;α=0.05). Amplitudes of all muscle groups in bird dog were higher compared to hip abduction (p≤0.0001; Range: BD: 14±3% (BD;VR) to 53±4%; HA: 7±2% (HA;VR) to 16±4% (HA;DR)). EMG-RMS showed significant differences (p<0.001) between conditions and muscle groups per exercise. Interaction effects were only significant for HA (p=0.02). No significant differences were present in EMG ratios (p>0.05). Additional high-intensity perturbations during core-specific sensorimotor exercises lead to increased neuromuscular activity and therefore higher exercise intensities. However, the beneficial effects on trunk function remain unclear. Nevertheless, BD is more suitable to address trunk muscles.
特定核心感觉运动练习已被证明可增强躯干的神经肌肉活动。然而,在这种情况下,高强度干扰对训练效率的影响尚不清楚。16名参与者(29±2岁;175±8厘米;69±13千克)配备了12导联双侧躯干肌电图。在测力计上进行热身,随后进行最大自主等长躯干(屈伸)收缩(MVC)。接下来,参与者在稳定表面(HA)、不稳定表面(HAP)、有干扰的稳定表面(HA+P)和有干扰的不稳定表面(HAP+P)上随机重复进行四项单腿站立并髋关节外展的条件。之后,在相同条件下进行鸟狗式动作(BD、BDP、BD+P、BDP+P)。脚下(HA)或膝盖下(BD)的泡沫垫用作不稳定表面。练习在可移动平台上进行。在前后方向随机施加干扰(加速度50米/秒;持续时间100毫秒;重复10次)。计算归一化至MVC(%)的均方根(RMS)(整个运动周期)。肌肉分为腹侧左右(VR;VL)和背侧左右(DR;DL)。计算腹背和左右比率(双向重复测量方差分析;α=0.05)。与髋关节外展相比,鸟狗式动作中所有肌肉群的幅度更高(p≤0.0001;范围:BD:14±3%(BD;VR)至53±4%;HA:7±2%(HA;VR)至16±4%(HA;DR))。每次练习中,肌电图RMS在不同条件和肌肉群之间显示出显著差异(p<0.001)。交互作用仅在HA中显著(p=0.02)。肌电图比率无显著差异(p>0.05)。特定核心感觉运动练习期间额外的高强度干扰会导致神经肌肉活动增加,从而提高运动强度。然而,对躯干功能有益的影响仍不清楚。尽管如此,但鸟狗式动作更适合锻炼躯干肌肉。
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