Verbecque Evi, Van Criekinge Tamaya, Vanloot Delphine, Coeckelbergh Tanja, Van de Heyning Paul, Hallemans Ann, Vereeck Luc
Department of Rehabilitation Sciences and Physiotherapy, Faculty of Medicine and Health Science, University of Antwerp, Antwerp, Belgium; Multidisciplinary Motor Centre Antwerp (M²OCEAN), University of Antwerp, Belgium.
Department of Rehabilitation Sciences and Physiotherapy, Faculty of Medicine and Health Science, University of Antwerp, Antwerp, Belgium; Multidisciplinary Motor Centre Antwerp (M²OCEAN), University of Antwerp, Belgium.
Gait Posture. 2018 Sep;65:137-142. doi: 10.1016/j.gaitpost.2018.07.166. Epub 2018 Jul 19.
This study aimed to report normative reference data for a Dynamic Visual Acuity test while walking on treadmill. The protocol's suitability was assessed by investigating its test-retest reliability and its validity through the drop-out rate and verification of the frequency of head movements. Furthermore, the influence of age on visual acuity loss (VAL) was determined to reveal the need for age-specific reference data.
Visual acuity was measured in 171 healthy adult participants (age range: 20.0-77.3 years; mean age: 40.1 years) with the head stationary (SVA) and in a dynamic condition (DVA) while walking on treadmill at 3, 4, 6 and 9 km/h. Relative test-retest reliability on SVA and DVA was investigated with intraclass correlation coefficients (ICC). The measurement errors of SVA, DVA and VAL were calculated for absolute reliability. Influence of age on VAL was investigated with regression analysis, followed by an ANOVA to investigate decade-related differences. The drop-out rate during DVA was mapped using a frequency table. Head frequencies were monitored using 3D motion tracking software.
Strong consistency (ICC ≥ 0.89) was found for SVA and DVA values. Measurement errors for VAL were less than 0.1 logMAR. Younger participants (decade 3-4) showed less VAL at 3 and 4 km/h. The drop-out rate increased with increasing walking speed (0-18.8%), especially in older adults. Although head frequency increased with increasing speed, the dominant frequency ranged around 2 Hz for all walking speeds.
This DVA protocol is reliable and normative data have been established. To facilitate its use in clinical practice, further validation of the protocol in patients with bilateral vestibulopathy is needed.
本研究旨在报告在跑步机上行走时进行动态视力测试的规范参考数据。通过调查其重测信度以及通过失访率和头部运动频率验证来评估该方案的适用性。此外，确定年龄对视力下降（VAL）的影响，以揭示是否需要特定年龄的参考数据。
对171名健康成年参与者（年龄范围：20.0 - 77.3岁；平均年龄：40.1岁）在头部静止（SVA）和动态条件（DVA）下进行视力测量，动态条件下是在跑步机上以3、4、6和9公里/小时的速度行走。使用组内相关系数（ICC）研究SVA和DVA的相对重测信度。计算SVA、DVA和VAL的测量误差以评估绝对信度。通过回归分析研究年龄对VAL的影响，随后进行方差分析以研究与十年相关的差异。使用频率表绘制DVA期间的失访率。使用3D运动跟踪软件监测头部频率。
SVA和DVA值具有很强的一致性（ICC≥0.89）。VAL的测量误差小于0.1 logMAR。较年轻的参与者（30 - 40岁）在3和4公里/小时时显示出较少的VAL。失访率随着步行速度的增加而增加（0 - 18.8%），尤其是在老年人中。尽管头部频率随着速度增加而增加，但所有步行速度下的主导频率都在2赫兹左右。
该DVA方案是可靠的，并已建立规范数据。为便于其在临床实践中的应用，需要在双侧前庭病变患者中对该方案进行进一步验证。
