Ito Tadashi, Sakai Yoshihito, Yamazaki Kazunori, Ito Yohei, Kawai Keitaro, Kato Yoshiji, Sugiura Hideshi, Morita Yoshifumi
Three-Dimensional Motion Analysis Room, Aichi Prefectural Mikawa Aoitori Medical and Rehabilitation Center for Developmental Disabilities, Okazaki 444-0002, Japan.
Department of Physical Therapy, Graduate School of Medicine, Nagoya University, Nagoya 461-8673, Japan.
Healthcare (Basel). 2021 Feb 15;9(2):210. doi: 10.3390/healthcare9020210.
This study aimed to assess differences in somatosensory control strategies between older patients with sagittal imbalance and young adults during postural tasks. The center of pressure displacement in 27 older patients with sagittal imbalance and 27 young adults was determined upon standing blindfolded on a balance board. Vibratory stimulation at 56 to 100 Hz was applied bilaterally to the gastrocnemius and soleus muscles (GS) and lumbar multifidus to evaluate the contributions of proprioceptive signals to postural control. Data of older patients and young adults were compared using the Mann-Whitney U-test or independent sample t-tests. Compared with the young adults, the older patients were significantly more reliant on the GS ( < 0.005) for their postural control and showed a higher relative proprioceptive weighting ratio (RPW) ( = 0.038). The postural strategy adopted by the older patients depended on the level of proprioceptive stimulation applied to the GS, and the postural control strategy of the ankle correlated with RPW. Overall, this study identifies RPW as a novel measure of postural strategy in older patients with sagittal imbalance and provides an understanding of strategies used to maintain balance, which may assist in developing preventative measures to reduce the risk of falls.
本研究旨在评估矢状面失衡老年患者与年轻人在姿势任务期间体感控制策略的差异。27例矢状面失衡老年患者和27例年轻人在蒙眼站立于平衡板上时测定其压力中心位移。对腓肠肌和比目鱼肌（GS）以及腰多裂肌双侧施加56至100Hz的振动刺激，以评估本体感觉信号对姿势控制的贡献。使用曼-惠特尼U检验或独立样本t检验比较老年患者和年轻人的数据。与年轻人相比，老年患者在姿势控制方面对GS的依赖程度显著更高（<0.005），并且表现出更高的相对本体感觉加权比（RPW）（=0.038）。老年患者采用的姿势策略取决于施加于GS的本体感觉刺激水平，并且踝关节的姿势控制策略与RPW相关。总体而言，本研究将RPW确定为矢状面失衡老年患者姿势策略的一种新测量方法，并提供了对用于维持平衡的策略的理解，这可能有助于制定预防措施以降低跌倒风险。
