Lehmann Tim, Visser Anton, Havers Tim, Büchel Daniel, Baumeister Jochen
Exercise Science & Neuroscience Unit, Department of Exercise & Health, Faculty of Science, Paderborn University, Paderborn, Germany.
Department Fitness and Health, IST University of Applied Sciences, Duesseldorf, Germany.
Exp Brain Res. 2025 Mar 3;243(4):80. doi: 10.1007/s00221-025-07039-2.
Random fluctuations in somatosensory signals affect the ability of effectively coordinating multimodal information pertaining to the postural state during movement. Therefore, this study aimed to investigate the impact of a compliant surface on cortico-cortical causal information flow during multi-joint compound movements. Fifteen healthy adults (7 female / 8 male, 25.9 ± 4.0 years) performed 5 × 20 repetitions of bodyweight squats on firm and compliant surface. Motor behavior was quantified by center of pressure (CoP) displacements, hip movement and the root mean square of the rectus femoris activity. Using source space analysis, renormalized partial directed coherence (rPDC) computed subject-level multivariate effective brain connectivity of sensorimotor nodes. Bootstrap statistics revealed significantly decreased medio-lateral CoP displacement (p < 0.001), significantly increased velocity of medio-lateral hip motion (p < 0.001) as well as significantly lower rectus femoris activity (p < 0.01) in the compliant surface condition. On the cortical level, rPDC showed significantly modulated information flow in theta and beta frequencies for fronto-parietal edges (p < 0.01) only during the concentric phase of the movement. The compliant surface led to increased difficulties controlling hip but not center of pressure motion in the medio-lateral plane. Moreover, a decreased activation of the prime movers accompanied by modulations of effective brain connectivity among fronto-central nodes may point to altered demands on sensorimotor information processing in presence of sensory noise when performing bodyweight squats on compliant surface. Further studies are needed to evaluate a potential benefit for athletic and clinical populations.
体感信号的随机波动会影响在运动过程中有效协调与姿势状态相关的多模态信息的能力。因此，本研究旨在探讨在多关节复合运动过程中，顺应性表面对皮质-皮质因果信息流的影响。15名健康成年人（7名女性/8名男性，年龄25.9±4.0岁）在坚硬和顺应性表面上进行了5×20次的体重深蹲。通过压力中心（CoP）位移、髋关节运动和股直肌活动的均方根来量化运动行为。使用源空间分析，重新归一化的偏定向相干性（rPDC）计算了感觉运动节点的个体水平多变量有效脑连接性。自举统计显示，在顺应性表面条件下，中-外侧CoP位移显著降低（p<0.001），中-外侧髋关节运动速度显著增加（p<0.001），股直肌活动也显著降低（p<0.01）。在皮质水平上，rPDC显示仅在运动的向心阶段，额顶叶边缘的θ和β频率的信息流有显著调制（p<0.01）。顺应性表面导致在中-外侧平面控制髋关节的难度增加，但不影响压力中心运动。此外，原动肌的激活减少，同时额中央节点之间的有效脑连接性发生调制，这可能表明在顺应性表面上进行体重深蹲时，存在感觉噪声的情况下，对感觉运动信息处理的需求发生了改变。需要进一步的研究来评估对运动员和临床人群的潜在益处。
