Sotirakis Haralampos, Patikas Dimitrios A, Papaxanthis Charalampos, Hatzitaki Vassilia
Department of Physical Education and Sport Sciences, Aristotle University of Thessaloniki, Thessaloniki 54006, Greece.
Department of Physical Education and Sport Science at Serres, Aristotle University of Thessaloniki, Serres 62110, Greece.
Gait Posture. 2022 Jun;95:22-29. doi: 10.1016/j.gaitpost.2022.03.018. Epub 2022 Mar 26.
Whole-body tracking of visual motion cues is used in balance training to improve weight shifting ability in old age and sports.
How tracking of a complex (pink noise) and a periodic visual target motion during anteroposterior weight shifting affects postural and muscle responses to unilateral hip vibration.
Twenty-six participants performed 160 anteroposterior weight shifting cycles while tracking the vertical motion of a visual target, concurrently receiving Center of Pressure (CoP) feedback. They were randomly divided to groups; (a) the Constant group tracked a visual target motion constructed by 3 sinusoids of different amplitude, and (b) the Pink group tracked a complex visual target motion constructed by a pink noise generation process. Between the 60th and the 120th cycle, vibration was applied to the right gluteus medius, introducing a sideways CoP deviation. CoP displacement and electromyographic (EMG) responses of soleus, tibialis anterior and peroneus longus were recorded and summarized in blocks of 3 cycles.
Sideways CoP deviation induced at the onset/offset of unilateral hip vibration was smaller for the Pink than the Constant group. The Pink group demonstrated greater tibialis anterior and peroneus longus EMG activity around the most anterior sway peak while soleus EMG was similar for the two groups. Both groups successfully coupled weight shifting amplitude to the target motion, but the Pink group tracked the target motion with a greater delay compared to the Constant group.
Whole body tracking of complex visual motions evokes perception-based action and increases ankle muscle co-activation making sway more resilient to a proprioceptive perturbation induced by unilateral hip vibration. Complex visual guidance motions should be considered when designing balance rehabilitation regimes, aiming at improving weight shifting ability and dynamic balance control.
在平衡训练中，利用视觉运动线索进行全身追踪，以提高老年人和运动员的体重转移能力。
在前后方向体重转移过程中，追踪复杂（粉色噪声）和周期性视觉目标运动如何影响对单侧髋部振动的姿势和肌肉反应。
26名参与者在追踪视觉目标垂直运动的同时进行160次前后方向体重转移循环，并同时接收压力中心（CoP）反馈。他们被随机分为两组；（a）恒定组追踪由3个不同振幅正弦波构成的视觉目标运动，（b）粉色组追踪由粉色噪声生成过程构建的复杂视觉目标运动。在第60个和第120个循环之间，对右臀中肌施加振动，导致CoP向侧面偏移。记录CoP位移以及比目鱼肌、胫骨前肌和腓骨长肌的肌电图（EMG）反应，并以3个循环为一组进行汇总。
单侧髋部振动开始/结束时诱发的CoP向侧面偏移，粉色组比恒定组小。粉色组在最前侧摆动峰值附近表现出更大的胫骨前肌和腓骨长肌EMG活动，而两组比目鱼肌的EMG活动相似。两组均成功将体重转移幅度与目标运动相耦合，但粉色组追踪目标运动的延迟比恒定组更大。
对复杂视觉运动进行全身追踪可引发基于感知的动作，并增加踝关节肌肉共同激活，使摆动对单侧髋部振动引起的本体感觉扰动更具弹性。在设计平衡康复方案时，应考虑复杂视觉引导运动，以提高体重转移能力和动态平衡控制。
