Kosonen Jukka, Kulmala Juha-Pekka, Müller Erich, Avela Janne
Neuromuscular Research Center, Department of Biology of Physical Activity, University of Jyväskylä, Finland.
Neuromuscular Research Center, Department of Biology of Physical Activity, University of Jyväskylä, Finland; Motion Analysis Laboratory, Children's Hospital, University of Helsinki and Helsinki University Hospital, Helsinki, Finland.
J Biomech. 2017 Mar 21;54:58-63. doi: 10.1016/j.jbiomech.2017.01.041. Epub 2017 Feb 6.
Anti-pronation orthoses, like medially posted insoles (MPI), have traditionally been used to treat various of lower limb problems. Yet, we know surprisingly little about their effects on overall foot motion and lower limb mechanics across walking and running, which represent highly different loading conditions. To address this issue, multi-segment foot and lower limb mechanics was examined among 11 overpronating men with normal (NORM) and MPI insoles during walking (self-selected speed 1.70±0.19m/s vs 1.72±0.20m/s, respectively) and running (4.04±0.17m/s vs 4.10±0.13m/s, respectively). The kinematic results showed that MPI reduced the peak forefoot eversion movement in respect to both hindfoot and tibia across walking and running when compared to NORM (p<0.05-0.01). No differences were found in hindfoot eversion between conditions. The kinetic results showed no insole effects in walking, but during running MPI shifted center of pressure medially under the foot (p<0.01) leading to an increase in frontal plane moments at the hip (p<0.05) and knee (p<0.05) joints and a reduction at the ankle joint (p<0.05). These findings indicate that MPI primarily controlled the forefoot motion across walking and running. While kinetic response to MPI was more pronounced in running than walking, kinematic effects were essentially similar across both modes. This suggests that despite higher loads placed upon lower limb during running, there is no need to have a stiffer insoles to achieve similar reduction in the forefoot motion than in walking.
抗内旋矫形器，如内侧加垫鞋垫（MPI），传统上一直用于治疗各种下肢问题。然而，令人惊讶的是，我们对它们在步行和跑步过程中对足部整体运动和下肢力学的影响知之甚少，而步行和跑步代表了截然不同的负荷条件。为了解决这个问题，我们对11名内旋过度的男性在穿着普通（NORM）鞋垫和MPI鞋垫行走（自定速度分别为1.70±0.19米/秒和1.72±0.20米/秒）和跑步（4.04±0.17米/秒和4.10±0.13米/秒）时的多节段足部和下肢力学进行了研究。运动学结果表明，与NORM相比，MPI在步行和跑步过程中均降低了前足相对于后足和胫骨的外翻峰值运动（p<0.05 - 0.01）。两种条件下后足外翻未发现差异。动力学结果表明，步行时鞋垫没有影响，但在跑步过程中，MPI使足底压力中心向内侧移动（p<0.01），导致髋关节（p<0.05）和膝关节（p<0.05）在额状面的力矩增加，而踝关节的力矩减小（p<0.05）。这些发现表明，MPI主要控制了步行和跑步过程中的前足运动。虽然MPI在跑步时的动力学反应比步行时更明显，但两种模式下的运动学效应基本相似。这表明，尽管跑步时下肢承受的负荷更高，但不需要更硬的鞋垫来实现与步行时相似的前足运动减少。
