Plantar feedback contributes to the regulation of leg stiffness
Plantar feedback contributes to the regulation of leg stiffness
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DOI：
10.1016/j.clinbiomech.2005.03.013
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发表时间：
2005-11-01
影响因子：
1.8
通讯作者：
Williams, B
中科院分区：
文献类型：
--
作者：
Fiolkowski, P;Bishop, M;Williams, B
背景奔跑和跳跃涉及以弹跳的方式移动，在此期间四肢表现为弹簧。改变这些腿部弹簧的刚度的能力对于保持有效的步态是必不可少的。由于足底表面的脚是唯一的一部分，在双足运动过程中遇到地面的身体，这似乎是合乎逻辑的，一些方面的神经功能的脚是负责的表面特性的信息传输到中枢神经系统，导致腿部僵硬的变化。10名受试者（9名男性，1名女性）参加了本实验。在外踝下方和后方注射利多卡因，以实现踝关节水平的胫神经阻滞。受试者在测力板上以2.2 Hz跳跃，而数据以1000 Hz收集。分析峰值力和腿部刚度的数据，并使用重复测量ANOVA进行比较。触觉、深压感和外展拇肌活动在注射后显著降低，姿势稳定性也显著降低。受试者在神经阻滞后表现出腿部僵硬度显著降低（P <0.01）。足底感觉对调节跳跃中的腿部力学有影响。该区域的感觉丧失会对步态中腿部的特性产生重大影响，未来的研究应确定足底反馈发挥这种作用的具体途径。(c)2005爱思唯尔有限公司保留所有权利。
Background. Running and hopping involve moving in a bouncing fashion during which the limbs behave as springs. The ability to alter the stiffness of these leg springs is essential to maintaining an efficient gait. Since the plantar surface of the foot is the only part of the body to encounter the ground during bipedal locomotion, it would seem logical that some aspect of the neurological functioning of the foot is responsible for transmission of information about the surface characteristics to the central nervous system, resulting in changes in leg stiffness.Methods. Ten subjects (9 males, 1 female) participated in this experiment. Lidocaine was injected inferior and posterior to the lateral malleolus in order to achieve tibial nerve block at the level of the ankle. Subjects hopped at 2.2 Hz on a force plate while data were collected at 1000 Hz. Data were analyzed for peak force and leg stiffness and compared using a repeated measures ANOVA.Findings. Tactile sensation, deep pressure sensation, and abductor hallucis activity displayed significant decreases following the injection, as did postural stability. Subjects demonstrated a significantly decreased leg stiffness after the nerve block (P < .01).Interpretation. Plantar sensation has an effect on regulating leg mechanics in hopping. A loss of sensation in this region can exert a significant impact on the properties of the leg in gait, and future research should determine the specific pathways by which plantar feedback exerts this effect. (c) 2005 Elsevier Ltd. All rights reserved.