Kunimura Hiroshi, Oda Hitoshi, Kawasaki Taku, Tsujinaka Ryo, Hamada Naoki, Fukuda Shiho, Matsuoka Masakazu, Hiraoka Koichi
Graduate School of Rehabilitation Science, Osaka Metropolitan University, 3-7-30 Habikino, Habikino 583-8555, Osaka, Japan.
Department of Physical Therapy, Todaiji Ryoiku Hospital for Children, 406-1 Zoshicho, Nara 630-8211, Nara, Japan.
Brain Sci. 2023 Oct 4;13(10):1411. doi: 10.3390/brainsci13101411.
This present study examined the effect of the laterally moving tactile stimuli (LMTS) to the sole on the anticipatory postural adjustment (APA) of the gait initiation. Thirteen healthy males participated in this study. A sound cue was provided at the beginning of each trial. The participants took three steps forward from a quiet stance at their preferred time after the start cue. The LMTS were delivered to the sole after the start cue. The loci of the tactile stimuli moved from the left- to the right-most side of the sole and then moved from the right- to the left-most side of that in a stimuli cycle. The duration of one stimuli cycle was 960 ms, and this cycle was repeated 16 times in a trial. The APA did not onset at the specific direction or phase of the LMTS, indicating that they did not use any specific phase of the stimuli as a trigger for initiating the gait. The LMTS decreased the amplitude and increased the duration of the APA. Simultaneously, the LMTS increased the time between the APA onset and toe-off of the initial support leg, indicating that they moved slowly when initiating gait during the LMTS. Those findings are explained by the view that the suppression of the APA induced via the LMTS to the sole is caused by the slowing down of the gait initiation due to masking the tactile sensation of the sole.
本研究考察了对足底施加横向移动触觉刺激（LMTS）对步态起始时预期姿势调整（APA）的影响。13名健康男性参与了本研究。每次试验开始时会给出一个声音提示。参与者在起始提示后，在自己偏好的时间从安静站立姿势向前迈出三步。在起始提示后对足底施加LMTS。在一个刺激周期内，触觉刺激的位置从足底最左侧移动到最右侧，然后再从最右侧移动到最左侧。一个刺激周期的持续时间为960毫秒，在一次试验中这个周期重复16次。APA并非在LMTS的特定方向或阶段开始，这表明他们没有将刺激的任何特定阶段用作启动步态的触发因素。LMTS减小了APA的幅度并增加了其持续时间。同时，LMTS增加了APA起始与初始支撑腿离地之间的时间，这表明在LMTS期间启动步态时他们移动得较慢。这些发现可以通过以下观点来解释：对足底施加LMTS所诱导的APA抑制是由于掩盖了足底的触觉感觉导致步态起始减慢所致。
