Kodama Kentaro, Yasuda Kazuhiro, Akatsuka Tomoki, Kuznetsov Nikita A, Iwata Hiroyasu
University Education Center, Tokyo Metropolitan University, 1-1 Minami-Osawa, Hachioji-shi, Tokyo 192-0397, Japan.
Research Institute for Science and Engineering, Waseda University, 3-4-1 Okubo, Shinjuku-ku, Tokyo 169-8555, Japan.
Neurosci Lett. 2022 Aug 24;786:136807. doi: 10.1016/j.neulet.2022.136807. Epub 2022 Jul 16.
The effectiveness of sensory substitution technology, such as haptic-based vibrotactile biofeedback (VBF), has been verified for balance training and rehabilitation. However, whether VBF training changes postural dynamics in older people remains unknown. This study investigated the influence of VBF training on postural dynamics during single-leg standing in older adults, using detrended fluctuation analysis (DFA). Twenty older adults participated in this study. Measurement of postural sway comprised three phases: first measurement session as a baseline test, postural training (day 1), and second measurement session (day 2). The BF group received BF training during the balance training session, while the control group practiced single-leg stance without BF. The center of pressure (CoP) trajectory was recorded in the first measurement session (pre) and second measurement session (post) at 50 Hz. DFA revealed the presence of two linear scaling regions in the CoP, indicating the presence of fast- and slow-scale fluctuations. For the BF group, slow-scale postural dynamics revealed more anti-persistent behavior after training in the anterior-posterior direction. However, the control group showed a change toward more random dynamics after training. These different influences suggest that the BF system might improve error correction strategies during single-leg standing for older adults, while single-leg standing training without the BF system might cause the loss of controllability in single-leg standing. Further, the results of the DFA are discussed in the context of balance training using VBF.
触觉振动生物反馈（VBF）等感觉替代技术在平衡训练和康复中的有效性已得到验证。然而，VBF训练是否会改变老年人的姿势动态仍不清楚。本研究采用去趋势波动分析（DFA），调查了VBF训练对老年人单腿站立时姿势动态的影响。20名老年人参与了本研究。姿势摇摆的测量包括三个阶段：第一次测量作为基线测试、姿势训练（第1天）和第二次测量（第2天）。BF组在平衡训练期间接受BF训练，而对照组在无BF的情况下练习单腿站立。在第一次测量（前）和第二次测量（后）时，以50Hz记录压力中心（CoP）轨迹。DFA显示CoP中存在两个线性标度区域，表明存在快尺度和慢尺度波动。对于BF组，慢尺度姿势动态在训练后在前后方向上显示出更多的反持续性行为。然而，对照组在训练后显示出向更随机动态的变化。这些不同的影响表明，BF系统可能会改善老年人单腿站立时的误差校正策略，而无BF系统的单腿站立训练可能会导致单腿站立时可控性的丧失。此外，还在使用VBF进行平衡训练的背景下讨论了DFA的结果。
