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首页> 外文期刊>Gait & posture >Kinematic analysis of step ascent among patients with central visual field loss
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Kinematic analysis of step ascent among patients with central visual field loss

机译：运动性中枢性视野丧失患者阶梯上升的运动学分析

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摘要

Vision is of paramount importance in regulating adaptive gait. Using three-dimensional motion analysis, the current study investigated how central visual field loss (CFL) affects step ascent. Ten patients with chronic CFL (77 ± 10 years) and 13 visual normal participants (72 ± 6 years) walked up to and ascended a single step (of varying height). Movement kinematics assessed the period immediately prior to and during step ascent. Compared to visual normal participants, patients with CFL exhibited a lower lead foot horizontal crossing velocity, increased lead limb swing time and increased head flexion (looking down at more immediate areas of the ground/step). They also took longer to initiate the step up, transfer weight to the lead foot upon landing on the upper level and increased trail limb swing time when negotiating the medium and high step height. Increased variability was also shown in a number of dependant measures. Data indicate that during step ascent, patients with CFL exhibit a cautious stepping strategy when compared to visual normal participants. This cautious strategy becomes increasingly evident when negotiating higher step heights, as shown by an increased planning time prior to entering the relatively unstable period of single support during the step up. The increased variability among CFL patients increases their likelihood of experiencing dynamic instability and falling during step ascent.
机译：视觉对于调节适应性步态至关重要。当前研究使用三维运动分析，研究了中央视野损失（CFL）如何影响步伐上升。十名患有慢性CFL的患者（77±10岁）和13名视力正常的参与者（72±6岁）走到了一个台阶（高度不一）。运动学运动评估了阶梯上升之前和上升期间的时间。与视觉正常参与者相比，患有CFL的患者表现出更低的铅脚水平交叉速度，增加的铅肢摆动时间和增加的头屈曲（向下看地面/台阶的更近区域）。他们还花费了更长的时间来开始上台阶，在上地面时将重量转移到前脚上，并且在谈判中高台阶时增加了后肢的摆动时间。许多相关指标也显示出变异性的增加。数据表明，与视觉正常参与者相比，在逐步上升过程中，CFL患者表现出谨慎的迈步策略。在谈判更高的台阶高度时，这种谨慎的策略变得越来越明显，如在上升过程中进入相对不稳定的单支支撑期之前增加的计划时间所示。 CFL患者之间变异性的增加增加了他们在脚步上升过程中经历动态不稳定和跌倒的可能性。

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