Quan Wenjing, Ren Feng, Xu Datao, Gusztav Fekete, Baker Julien S, Gu Yaodong
Faculty of Sports Science, Ningbo University, Ningbo, China.
Savaria Institute of Technology, Eötvös Loránd University, Szombathely, Hungary.
Front Bioeng Biotechnol. 2021 Sep 24;9:746761. doi: 10.3389/fbioe.2021.746761. eCollection 2021.
Joint mechanics are permanently changed using different intensities and running durations. These variations in intensity and duration also influence fatigue during prolonged running. Little is known about the potential interactions between fatigue and joint mechanics in female recreational runners. Thus, the purpose of this study was to describe and examine kinematic and joint mechanical parameters when female recreational runners are subject to fatigue as a result of running. Fifty female recreational runners maintained running on a treadmill to induce fatigue conditions. Joint mechanics, sagittal joint angle, moment, and power were recorded pre- and immediately post fatigue treadmill running. Moderate reductions in absolute positive ankle power, total ankle energy dissipation, dorsiflexion at initial contact, max dorsiflexion angle, and range of motion of the joint ankle were collected after fatigue following prolonged fatigue running. Knee joint mechanics, joint angle, and joint power remained unchanged after prolonged fatigue running. Nevertheless, with the decreased ankle joint work, negative knee power increased. At the hip joint, the extension angle was significantly decreased. The range motion of the hip joint, hip positive work and hip positive power were increased during the post-prolonged fatigue running. This study found no proximal shift in knee joint mechanics in amateur female runners following prolonged fatigue running. The joint work redistribution was associated with running fatigue changes. As for long-distance running, runners should include muscle strength training to avoid the occurrence of running-related injuries.
使用不同强度和跑步持续时间会使关节力学发生永久性改变。这些强度和持续时间的变化也会影响长时间跑步时的疲劳程度。对于女性业余跑步者而言，疲劳与关节力学之间的潜在相互作用知之甚少。因此，本研究的目的是描述和研究女性业余跑步者因跑步而产生疲劳时的运动学和关节力学参数。五十名女性业余跑步者在跑步机上持续跑步以诱导疲劳状态。在疲劳跑步机跑步前后，记录关节力学、矢状面关节角度、力矩和功率。长时间疲劳跑步后疲劳状态下，绝对正踝关节功率、总踝关节能量耗散、初始接触时的背屈、最大背屈角度和踝关节关节活动范围均有适度降低。长时间疲劳跑步后膝关节力学、关节角度和关节功率保持不变。然而，随着踝关节功的减少，膝关节负功率增加。在髋关节处，伸展角度显著减小。长时间疲劳跑步后，髋关节活动范围、髋关节正功和髋关节正功率均增加。本研究发现，业余女性跑步者在长时间疲劳跑步后膝关节力学没有近端移位。关节功的重新分配与跑步疲劳变化有关。对于长跑而言，跑步者应进行肌肉力量训练以避免发生与跑步相关的损伤。
