Boyer Katherine A, Andriacchi Thomas P
Mechanical Engineering, Stanford University, Stanford, CA 94305-4038, USA.
Clin Biomech (Bristol). 2009 Dec;24(10):872-6. doi: 10.1016/j.clinbiomech.2009.08.003. Epub 2009 Sep 9.
A suggested link between ambulatory mechanics and injury development has resulted in significant interest the development of footwear to change locomotion patterns. The purpose of this study was to test the hypothesis that there will be significant changes in the kinematics and kinetics at the ankle and minimal changes at the knee and hip in the mechanics of running in a shoe with a sagittal plane curvature relative to a flat soled shoe.
During running 3-D lower extremity kinematics and kinetics for 19 healthy volunteers were quantified using an optoelectronics system and a force plate. Data were collected for a flat sole conventional shoe (New Balance 658 (Control)) and a shoe with a rounded sole in the sagittal plane (Masai Barefoot Technologies (MBT)). Data were compared for the two shoe conditions using paired Student t-tests (alpha=0.05).
The ankle dorsi-flexion angles at heel-strike and mid-stance were greater, while the ankle plantar and dorsi-flexion moments and peak ankle joint power were significantly lower with the MBT relative to the control (P<0.05). Decreases in the first medial GRF peak and the peak anterior GRF peak were also found for running in the MBT shoe.
Despite a major difference in sole geometry, accommodations to the rockered sole were found only at the ankle. These results suggest changes in ankle kinematics and kinetics may be used to minimize the effect of changes in sole rocker on limb dynamics. Thus, changes in shoe rocker may offer potential therapeutic opportunities for running related conditions at the ankle without substantial risk to the knee or hip.
动态力学与损伤发展之间的潜在联系引发了人们对开发能改变运动模式的鞋类产品的浓厚兴趣。本研究的目的是检验以下假设：与平底鞋相比，穿着具有矢状面曲率鞋底的鞋子跑步时，踝关节的运动学和动力学将发生显著变化，而膝关节和髋关节的变化最小。
使用光电系统和测力板对19名健康志愿者跑步时的三维下肢运动学和动力学进行量化。收集了平底传统鞋（新百伦658（对照组））和矢状面鞋底呈圆形的鞋子（马赛赤足科技（MBT））的数据。使用配对学生t检验（α=0.05）对两种鞋的情况进行数据比较。
与对照组相比，穿着MBT鞋时，足跟触地和支撑中期的踝关节背屈角度更大，而踝关节跖屈和背屈力矩以及踝关节峰值功率显著更低（P<0.05）。穿着MBT鞋跑步时，还发现第一内侧地面反作用力峰值和前向地面反作用力峰值降低。
尽管鞋底几何形状存在重大差异，但仅在踝关节处发现了对弧形鞋底的适应性变化。这些结果表明，踝关节运动学和动力学的变化可用于最小化鞋底弧度变化对肢体动力学的影响。因此，鞋类弧度的变化可能为与跑步相关的踝关节疾病提供潜在的治疗机会，而对膝关节或髋关节没有实质性风险。
