School of Health Studies, University of Memphis , Memphis, Tennessee, USA.
Department of Kinesiology, School of Public Health, Indiana University , Bloomington, Indiana, USA.
J Sports Sci. 2021 Jan;39(1):78-83. doi: 10.1080/02640414.2020.1804807. Epub 2020 Aug 13.
Distal-to-proximal redistribution of joint work occurs following exhaustive running in recreational but not competitive runners but the influence of a run on joint work is unknown. The purpose of this study was to assess if a long submaximal run produces a distal-to-proximal redistribution of positive joint work in well-trained runners. Thirteen rearfoot striking male runners (weekly distance: 72.6 ± 21.2 km) completed five running trials while three-dimensional kinematic and ground reaction force data were collected before and after a long submaximal treadmill run (19 ± 6 km). Joint kinetics were calculated from these data and percent contributions of joint work relative to total lower limb joint work were computed. Moderate reductions in absolute negative ankle work (p = 0.045, Cohen's = 0.31), peak plantarflexor torque (p = 0.004, = 0.34) and, peak negative ankle power (p = 0.005, = 0.32) were observed following the long run. Positive ankle, knee and hip joint work were unchanged (p < 0.05) following the long run. These findings suggest no proximal shift in positive joint work in well-trained runners after a prolonged run. Runner population, running pace, distance, and relative intensity should be considered when examining changes in joint work following prolonged running.
在休闲跑者中，剧烈跑后会出现关节功由远及近的重新分布，但在竞技跑者中则不会；然而，跑对关节功的影响尚不清楚。本研究旨在评估长距离亚极量跑是否会导致训练有素的跑者的正向关节功由远及近的重新分布。13 名后足着地的男性跑者（每周跑距：72.6±21.2km）在长距离亚极量跑步机跑（19±6km）前后分别完成了 5 次跑步试验，同时收集了三维运动学和地面反力数据。从这些数据中计算了关节动力学，计算了关节功相对于下肢总关节功的百分比贡献。长距离跑后，绝对负踝功（p=0.045，Cohen's =0.31）、峰值跖屈肌力矩（p=0.004， =0.34）和峰值负踝功率（p=0.005， =0.32）显著降低。长距离跑后，正踝、膝和髋关节功无变化（p<0.05）。这些发现表明，在长时间跑步后，训练有素的跑者的正向关节功没有向近端转移。在研究长时间跑步后关节功的变化时，应考虑跑者人群、跑步速度、距离和相对强度。
