Center for Orthopaedic & Biomechanics Research, Boise State University, Boise, ID 83725, USA; Key Laboratory of Exercise and Health Sciences of Ministry of Education, Shanghai University of Sport, Shanghai 2000438, China.
Center for Orthopaedic & Biomechanics Research, Boise State University, Boise, ID 83725, USA.
J Electromyogr Kinesiol. 2021 Apr;57:102527. doi: 10.1016/j.jelekin.2021.102527. Epub 2021 Jan 28.
This study investigated the lower extremity torque's active and passive features during the walk-to-run gait transition with continuously increased walking speed. Fourteen volunteers participated in the experiment. Kinematic and kinetic data were collected synchronously. Five strides leading up the gait transition were examined. Peaks of the passive (e.g., contact) and active (e.g., generalized muscle torques), along with net joint torque, and time to peak torques exhibited significant differences at the last stride before gait transition, compared to the first four strides, at the ankle, knee, and hip joints, respectively. Selected peak joint active and passive torques showed significant and opposite trends at critical events within a stride cycle: such ankle joint right after heel-contact, knee joint during weight acceptance, and both hip and knee joints right before toe-off. The magnitude and the corresponding time to active and passive peak torque changed in a nonlinear pattern before the transition from walk to run. The lower extremity segment-interaction during gait transition appeared to be an active reorganization exemplified by the interaction between the lower extremity's active and passive torque components.
本研究调查了在连续增加步行速度的情况下，从行走向跑步过渡过程中下肢扭矩的主动和被动特征。十四名志愿者参与了实验。运动学和动力学数据被同步采集。研究考察了步态转换前的五个步幅。与前四个步幅相比，在步态转换前的最后一个步幅中，踝关节、膝关节和髋关节的被动（例如接触）和主动（例如广义肌肉扭矩）峰值、净关节扭矩以及达到峰值扭矩的时间均有显著差异。在一个步幅周期内的关键事件中，选定的关节主动和被动扭矩表现出显著的相反趋势：例如，踝关节在脚跟接触后，膝关节在承重期间，以及髋关节和膝关节在脚趾离地前。在从行走过渡到跑步之前，主动和被动峰值扭矩的幅度及其对应的达到峰值扭矩的时间呈非线性变化。下肢段在步态转换过程中的相互作用似乎是一种主动的重新组织，以下肢主动和被动扭矩分量之间的相互作用为例。
