Ludwig Boltzmann Institute of Electrical Stimulation and Physical Rehabilitation, Wilheminenspital, Montrealstrasse 37, 1160 Vienna, Austria; University of Primorska, Science and Research Center, Institute for Kinesiological Research, Garibaldijeva 1, 6000 Koper, Slovenia.
Gait Posture. 2013 Sep;38(4):708-11. doi: 10.1016/j.gaitpost.2013.03.005. Epub 2013 Apr 6.
Literature confirms the effects of vision and stance on body sway and indicates possible interactions between the two. However, no attempts have been made to systematically compare the effect of vision on the different types of stance which are frequently used in clinical and research practice. The biomechanical changes that occur after changing shape and size of the support surface suggest possible sensory re-weighting might take place. The purpose of this study was to assess the effect of vision on body sway in relation to different stance configurations and width. Thirty-eight volunteers performed four quiet stance configurations (parallel, semi-tandem, tandem and single leg), repeating them with open and closed eyes. Traditional parameters, recurrence quantification analysis and sample entropy were analyzed from the CoP trajectory signal. Traditional and recurrence quantification analysis parameters were affected by vision removal and stance type. Exceptions were frequency of oscillation, entropy and trapping time. The most prominent effect of vision elimination on traditional parameters was observed for narrower stances. A significant interaction effect between vision removal and stance type was present for most of the parameters observed (p<0.05). The interaction effect between medio-lateral and antero-posterior traditional parameters differed in linearity between stances. The results confirm the effect of vision removal on the body sway. However, for the medio-lateral traditional parameters, the effects did not increase linearly with the change in width and stance type. This suggests that removal of vision could be more effectively compensated by other sensory systems in semi-tandem stance, tandem and single legged stance.
文献证实了视觉和姿势对身体摆动的影响，并表明两者之间可能存在相互作用。然而，尚未有人尝试系统地比较视觉对临床和研究实践中常用的不同姿势类型的影响。改变支撑表面的形状和大小后发生的生物力学变化表明，可能会发生感觉重新加权。本研究的目的是评估在不同姿势配置和宽度下视觉对身体摆动的影响。38 名志愿者进行了四种安静姿势配置（平行、半串联、串联和单腿），分别睁眼和闭眼重复。从 CoP 轨迹信号分析传统参数、递归定量分析和样本熵。传统和递归定量分析参数受视力丧失和姿势类型的影响。例外的是振荡频率、熵和捕获时间。视力丧失对传统参数的最显著影响在较窄的姿势中观察到。观察到的大多数参数都存在视力消除和姿势类型之间的显著交互作用（p<0.05）。中线和前后向传统参数之间的交互作用在线性方面在不同的姿势之间有所不同。结果证实了视力丧失对身体摆动的影响。然而，对于中线传统参数，随着宽度和姿势类型的变化，其影响并非线性增加。这表明在半串联姿势、串联姿势和单腿姿势中，视力丧失可以通过其他感觉系统更有效地得到补偿。
