Fadillioglu Cagla, Kanus Lisa, Möhler Felix, Ringhof Steffen, Hellmann Daniel, Stein Thorsten
BioMotion Center, Institute of Sports and Sports Science, Karlsruhe Institute of Technology, Karlsruhe, Germany.
Department of Prosthodontics, University of Würzburg, Würzburg, Germany.
Front Hum Neurosci. 2022 Mar 25;16:868828. doi: 10.3389/fnhum.2022.868828. eCollection 2022.
Multiple sensory signals from visual, somatosensory and vestibular systems are used for human postural control. To maintain postural stability, the central nervous system keeps the center of mass (CoM) within the base of support. The influence of the stomatognathic motor system on postural control has been established under static conditions, but it has not yet been investigated during dynamic steady-state balance. The purpose of the study was to investigate the effects of controlled stomatognathic motor activity on the control and stability of the CoM during dynamic steady-state balance. A total of 48 physically active and healthy adults were assigned to three groups with different stomatognathic motor conditions: jaw clenching, tongue pressing and habitual stomatognathic behavior. Dynamic steady-state balance was assessed using an oscillating platform and the kinematic data were collected with a 3D motion capturing system. The path length (PL) of the 3D CoM trajectory was used for quantifying CoM sway. Temporal dynamics of the CoM movement was assessed with a detrended fluctuation analysis (DFA). An uncontrolled manifold (UCM) analysis was applied to assess the stability and control of the CoM with a subject-specific anthropometric 3D model. The statistical analysis revealed that the groups did not differ significantly in PL, DFA scaling exponents or UCM parameters. The results indicated that deliberate jaw clenching or tongue pressing did not seem to affect the sway, control or stability of the CoM on an oscillating platform significantly. Because of the task-specificity of balance, further research investigating the effects of stomatognathic motor activities on dynamic steady-state balance with different movement tasks are needed. Additionally, further analysis by use of muscle synergies or co-contractions may reveal effects on the level of muscles, which were not visible on the level of kinematics. This study can contribute to the understanding of postural control mechanisms, particularly in relation to stomatognathic motor activities and under dynamic conditions.
来自视觉、体感和前庭系统的多种感觉信号被用于人体姿势控制。为维持姿势稳定性，中枢神经系统将质心（CoM）保持在支撑面内。口颌运动系统对姿势控制的影响已在静态条件下得到证实，但在动态稳态平衡期间尚未进行研究。本研究的目的是探讨在动态稳态平衡期间，受控的口颌运动活动对质心控制和稳定性的影响。共有48名身体活跃且健康的成年人被分为三组，分别处于不同的口颌运动状态：紧咬牙、舌压和习惯性口颌行为。使用振荡平台评估动态稳态平衡，并通过三维运动捕捉系统收集运动学数据。三维质心轨迹的路径长度（PL）用于量化质心摆动。采用去趋势波动分析（DFA）评估质心运动的时间动态。应用非受控流形（UCM）分析，通过特定个体的人体测量三维模型评估质心的稳定性和控制。统计分析表明，三组在PL、DFA标度指数或UCM参数方面无显著差异。结果表明，刻意紧咬牙或舌压似乎并未显著影响振荡平台上质心的摆动、控制或稳定性。由于平衡任务的特殊性，需要进一步研究口颌运动活动对不同运动任务动态稳态平衡的影响。此外，通过肌肉协同或共同收缩进行进一步分析，可能会揭示在运动学水平上不可见的对肌肉水平的影响。本研究有助于理解姿势控制机制，特别是与口颌运动活动相关以及在动态条件下的机制。
