Escola Superior da Tecnologia de Saúde do Porto, Instituto Politécnico do Porto, Área Científica de Fisioterapia, Centro de Estudos de Movimento e Actividade Humana, Rua Valente Perfeito 322, 4400-330 Vila Nova de Gaia, Portugal; Faculdade de Engenharia, Universidade do Porto, Rua Dr. Roberto Frias s/n, 4200-465 Porto, Portugal.
Gait Posture. 2014 Jan;39(1):98-104. doi: 10.1016/j.gaitpost.2013.06.003. Epub 2013 Jul 3.
This study investigated the influence of long-term wearing of unstable shoes (WUS) on compensatory postural adjustments (CPA) to an external perturbation.
Participants were divided into two groups: one wore unstable shoes while the other wore conventional shoes for 8 weeks. The ground reaction force signal was used to calculate the anterior-posterior (AP) displacement of the centre of pressure (CoP) and the electromyographic signal of gastrocnemius medialis (GM), tibialis anterior (TA), rectus femoris (RF) and biceps femoris (BF) muscles was used to assess individual muscle activity, antagonist co-activation and reciprocal activation at the joint (TA/GM and RF/(BF+GM) pairs) and muscle group levels (ventral (TA+RF)/dorsal (GM+BF) pair) within time intervals typical for CPA. The electromyographic signal was also used to assess muscle latency. The variables described were evaluated before and after the 8-week period while wearing the unstable shoes and barefoot.
Long-term WUS led to: an increase of BF activity in both conditions (barefoot and wearing the unstable shoes); a decrease of GM activity; an increase of antagonist co-activation and a decrease of reciprocal activation level at the TA/GM and ventral/dorsal pairs in the unstable shoe condition. Additionally, WUS led to a decrease in CoP displacement. However, no differences were observed in muscle onset and offset.
Results suggest that the prolonged use of unstable shoes leads to increased ankle and muscle groups' antagonist co-activation levels and higher performance by the postural control system.
本研究旨在探讨长期穿着不稳定鞋（WUS）对外部干扰下补偿性姿势调整（CPA）的影响。
参与者被分为两组：一组穿着不稳定鞋，另一组则穿着常规鞋 8 周。通过地面反力信号计算中心压力（CoP）的前后（AP）位移，同时利用腓肠肌内侧（GM）、胫骨前肌（TA）、股直肌（RF）和股二头肌（BF）的肌电图信号来评估个体肌肉活动、拮抗肌共激活和关节（TA/GM 和 RF/（BF+GM）对）以及肌肉群水平（腹侧（TA+RF）/背侧（GM+BF）对）的反向激活情况，这些时间间隔是 CPA 的典型代表。肌电图信号还用于评估肌肉潜伏期。在穿着不稳定鞋和赤脚的情况下，在 8 周的时间内，评估了这些变量的描述，然后评估了这些变量。
长期 WUS 导致：在两种情况下（赤脚和穿着不稳定鞋），BF 活动增加；GM 活动减少；拮抗肌共激活增加，TA/GM 和腹侧/背侧对的反向激活水平降低。此外，WUS 导致 CoP 位移减少。然而，在肌肉起始和结束时没有观察到差异。
结果表明，长期使用不稳定鞋会导致踝关节和肌肉群拮抗肌共激活水平增加，姿势控制系统的性能提高。
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