Fukata Kazuhiro, Amimoto Kazu, Sekine Daisuke, Ikarashi Yuka, Fujino Yuji, Inoue Masahide, Inoue Mamiko, Ishihara Shunichi, Takahashi Hidetoshi, Makita Shigeru
Department of Rehabilitation Center, Saitama Medical University International Medical Center, 1397-1 Yamane, Hidaka, Saitama, 350-1298, Japan.
Department of Physical Therapy, Tokyo Metropolitan University, 7-2-10 Higashi-Ogu, Arakawa-ku, Tokyo, 116-8551, Japan.
Atten Percept Psychophys. 2019 Feb;81(2):590-597. doi: 10.3758/s13414-018-1627-3.
The subjective postural vertical (SPV) reflects gravity perception when the eyes are closed. Changes in the SPV on both the frontal and sagittal planes occur in response to neurological disorders and aging; however, these changes on the diagonal plane are unclear. Here we examined test-retest reliability (n=16) of and age-related changes (n=38) in the SPV on the diagonal plane. Subjects sat on an electrical vertical board (EVB), which was used to measure the SPV on the diagonal plane. An experimenter controlled and moved the EVB seat at a constant speed on the diagonal plane and measured the seat's tilt using a digital inclinometer when subjects verbally reported that they had reached a true vertical position. Measurement was performed for eight trials, and the mean (tilt direction) and standard deviation (variability) were calculated. To determine test-retest reliability, the same experimenter repeatedly measured the SPV 1 week later. To assess age-related changes, tilt direction and variability were compared between the young (n=20) and elderly (n=18) groups. Test-retest reliability on the right and left diagonal planes was 0.61 or more. Moreover, tilt direction on the right diagonal plane - but not on the left diagonal plane - indicated a significant diagonally backward deviation in the elderly group compared with that in the young group. Variability was significantly higher in the elderly group on both planes. SPV measurement on the diagonal plane was indicated, and age-related changes were identified. Thus, future studies should assess the potential clinical applications of SPV in neurological disorders.
主观姿势垂直感（SPV）反映闭眼时的重力感知。额面和矢状面上SPV的变化会因神经疾病和衰老而发生；然而，对角面上的这些变化尚不清楚。在此，我们研究了对角面上SPV的重测信度（n = 16）和与年龄相关的变化（n = 38）。受试者坐在电动垂直板（EVB）上，该设备用于测量对角面上的SPV。当受试者口头报告他们已达到真正垂直位置时，实验者在对角面上以恒定速度控制并移动EVB座椅，并使用数字倾角仪测量座椅的倾斜度。进行了八次试验，并计算了平均值（倾斜方向）和标准差（变异性）。为了确定重测信度，同一名实验者在1周后重复测量SPV。为了评估与年龄相关的变化，比较了年轻组（n = 20）和老年组（n = 18）之间的倾斜方向和变异性。左右对角面的重测信度均为0.61或更高。此外，与年轻组相比，老年组右对角面上的倾斜方向（而非左对角面上的）显示出明显的对角向后偏差。两个平面上老年组的变异性均显著更高。对角面上的SPV测量结果得到了证实，并确定了与年龄相关的变化。因此，未来的研究应评估SPV在神经疾病中的潜在临床应用。
