Suganuma Junichi, Ueta Kozo, Nakanishi Koji, Ikeda Yumi, Morioka Shu
Faculty of Nursing and Rehabilitation Department, Physical Therapy, Chubu Gakuin University, Gifu, Japan; Department of Physical Therapy, Graduate School of Human Health Sciences, Tokyo Metropolitan University, Tokyo, Japan.
Department of Neurorehabilitation, Graduate School of Health Sciences, Kio University, Nara, Japan; Department of Rehabilitation, JCHO Siga Hospital, Siga, Japan.
Neurosci Lett. 2024 Aug 10;837:137900. doi: 10.1016/j.neulet.2024.137900. Epub 2024 Jul 15.
The mechanism by which postural threat induced by standing at a high height causes a decrease in the amplitude and an increase in the frequency of postural sway might involve voluntary control (VC) to avoid swaying, rather than conscious balance processing, in which postural threat directs conscious balance processing. This study aimed to clarify the differences between VC and conscious balance processing during quiet standing. Twenty-seven healthy young adults were instructed to stand with their feet placed together and keep their eyes open. The standing task was performed under three standing conditions: relaxed, VC, and high-conscious movement processing (high-CMP). The center of pressure in the anteroposterior (AP) and mediolateral (ML) directions was measured using a stabilometer to assess differences in postural control. The results indicated that the mean power frequency (MPF) ML and high frequency (HF) ML were higher in the VC condition than in the high-CMP condition. In the VC and high-CMP conditions, compared with the relaxed condition, MPF AP was higher, whereas the root mean square AP and low frequency AP were lower. These results show that the sway amplitude is lower, and the frequency is higher in both the VC and high-CMP conditions compared with those in the relaxed condition; however, the frequency is higher in the VC condition than in the high-CMP condition, suggesting that the VC condition is similar to postural control under the postural threat condition.
站在高处引发的姿势威胁导致姿势摆动幅度减小和频率增加的机制，可能涉及为避免摆动而进行的自主控制（VC），而非姿势威胁引导有意识平衡处理的有意识平衡处理。本研究旨在阐明安静站立期间自主控制和有意识平衡处理之间的差异。27名健康的年轻成年人被指示双脚并拢站立并睁开眼睛。站立任务在三种站立条件下进行：放松、自主控制和高意识运动处理（高CMP）。使用稳定仪测量前后（AP）和内外侧（ML）方向的压力中心，以评估姿势控制的差异。结果表明，自主控制条件下ML方向的平均功率频率（MPF）和高频（HF）ML高于高CMP条件。在自主控制和高CMP条件下，与放松条件相比，AP方向的MPF较高，而AP方向的均方根和低频较低。这些结果表明，与放松条件相比，自主控制和高CMP条件下的摆动幅度较低，频率较高；然而，自主控制条件下的频率高于高CMP条件，这表明自主控制条件类似于姿势威胁条件下的姿势控制。
