Neuroscience Program, University of Idaho, Moscow, ID 84844, United States.
Department of Biological Sciences, University of Idaho, Moscow, ID 84844, United States.
J Biomech. 2014 Aug 22;47(11):2745-50. doi: 10.1016/j.jbiomech.2014.04.043. Epub 2014 Jun 2.
A number of interventions and technique changes have been proposed to attempt to improve performance and reduce the number of running related injuries. Running shoes, barefoot running and alterations in spatio-temporal parameters (stride frequency and stride length) have been associated with significant kinematic and kinetic changes, which may have implications for performance and injury prevention. However, because footwear interventions have been shown to also affect spatio-temporal parameters, there is uncertainty regarding the origin of the kinematic and kinetic alterations. Therefore, the purpose of this study was to independently evaluate the effects of shoes and changes in stride length on lower extremity kinetics. Eleven individuals ran over-ground at stride lengths ± 5 and 10% of their preferred stride length, in both the barefoot and shod condition. Three-dimensional motion capture and force plate data were captured synchronously and used to compute lower extremity joint moments. We found a significant main effect of stride length on anterior-posterior and vertical GRFs, and sagittal plane knee and ankle moments in both barefoot and shod running. When subjects ran at identical stride lengths in the barefoot and shod conditions we did not observe differences for any of the kinetic variables that were measured. These findings suggest that barefoot running triggers a decrease in stride length, which could lead to a decrease in GRFs and sagittal plane joint moments. When evaluating barefoot running as a potential option to reduce injury, it is important to consider the associated change in stride length.
已经提出了许多干预措施和技术改变，试图提高表现并减少与跑步相关的受伤数量。跑鞋、赤脚跑步和时空参数（步频和步长）的改变与显著的运动学和动力学变化有关，这可能对表现和预防受伤有影响。然而，由于鞋类干预也被证明会影响时空参数，因此对于运动学和动力学改变的起源存在不确定性。因此，本研究的目的是独立评估鞋子和步长改变对下肢动力学的影响。11 名个体在赤脚和穿鞋条件下，以其偏好步长的±5%和 10%的步长在地面上跑步。三维运动捕捉和力板数据被同步捕捉，并用于计算下肢关节力矩。我们发现步长在赤脚和穿鞋跑步的前后和垂直 GRF 以及矢状面膝关节和踝关节力矩上有显著的主要影响。当个体在赤脚和穿鞋条件下以相同的步长跑步时，我们没有观察到所测量的任何动力学变量的差异。这些发现表明赤脚跑步会触发步长的减少，这可能导致 GRF 和矢状面关节力矩的减少。在评估赤脚跑步作为减少受伤的潜在选择时，考虑与步长相关的改变很重要。
