Can explicit visual feedback of postural sway efface the effects of sensory manipulations on mediolateral balance performance?
Can explicit visual feedback of postural sway efface the effects of sensory manipulations on mediolateral balance performance?
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DOI：
10.1152/jn.00103.2014
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发表时间：
2016-02-01
影响因子：
2.5
通讯作者：
van Dieen, Jaap H.
中科院分区：
文献类型：
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作者：
Lizama, L. Eduardo Cofre;Pijnappels, Mirjam;van Dieen, Jaap H.
在平衡评估和训练中经常使用关于姿势摇摆的明确视觉反馈。然而，视觉信息的加重可能会掩盖其他感觉系统的损伤。因此，我们的目的是确定是否减少躯体感觉，前庭，和本体感觉的操作对内外平衡的影响，通过明确的视觉反馈的身体质量中心的内外摇摆和视觉信息的存在。我们操纵的感觉输入的躯体感觉系统的经皮电神经刺激足底（TENS）的前庭系统的前庭电流刺激（GVS）和本体感觉系统的肌肉肌腱振动（VMS）的髋外展肌。这些操作对内外侧摇摆的影响进行了比较，在三个视觉条件下没有操作的控制条件：明确的身体重心（FB），眼睛打开（EO），和眼睛关闭（EC）的摇摆反馈。中外侧摇摆被量化为功率谱中的能量的总和，并且被量化为每个操纵信号中的主频率处的能量。重复测量方差分析被用来测试每一个感官操作，视觉条件和它们的相互作用的影响。总体而言，感觉操纵增加了身体摇摆与控制条件相比。正常视觉信息的缺乏对摇摆没有影响，而外显反馈减少摇摆。此外，视觉信息和感觉操纵的相互作用被发现在特定的优势频率GVS和VMS，与明确的反馈减少的操作的影响，但不抹去这些。
Explicit visual feedback on postural sway is often used in balance assessment and training. However, up-weighting of visual information may mask impairments of other sensory systems. We therefore aimed to determine whether the effects of somatosensory, vestibular, and proprioceptive manipulations on mediolateral balance are reduced by explicit visual feedback on mediolateral sway of the body center of mass and by the presence of visual information. We manipulated sensory inputs of the somatosensory system by transcutaneous electric nerve stimulation on the feet soles (TENS) of the vestibular system by galvanic vestibular stimulation (GVS) and of the proprioceptive system by muscle-tendon vibration (VMS) of hip abductors. The effects of these manipulations on mediolateral sway were compared with a control condition without manipulation under three visual conditions: explicit feedback of sway of the body center of mass (FB), eyes open (EO), and eyes closed (EC). Mediolateral sway was quantified as the sum of energies in the power spectrum and as the energy at the dominant frequencies in each of the manipulation signals. Repeated-measures ANOVAs were used to test effects of each of the sensory manipulations, of visual conditions and their interaction. Overall, sensory manipulations increased body sway compared with the control conditions. Absence of normal visual information had no effect on sway, while explicit feedback reduced sway. Furthermore, interactions of visual information and sensory manipulation were found at specific dominant frequencies for GVS and VMS, with explicit feedback reducing the effects of the manipulations but not effacing these.