Yan Chenxi, Bice Ryan J, Frame Jeff W, Kersh Mariana E, Warden Stuart J
Beckman Institute for Advanced Science and Technology, University of Illinois at Urbana-Champaign, IL, USA; Innovation Center for Medical Engineering & Engineering Medicine, Hangzhou International Innovation Institute, Beihang University, Hangzhou, China; Key Laboratory of Biomechanics and Mechanobiology, Ministry of Education, Beijing Advanced Innovation Center for Biomedical Engineering, School of Biological and Medical Engineering, Beihang University, Beijing, China.
Department of Physical Therapy, School of Health and Human Sciences, Indiana University Indianapolis, Indianapolis, IN, USA.
Bone. 2025 Apr;193:117417. doi: 10.1016/j.bone.2025.117417. Epub 2025 Jan 30.
The tibia is one of the most common sites for bone stress injury (BSI) in active individuals. BSIs are thought to occur in response to damage accumulation from repetitive loading below the tissue's yield limit. The effect of fatigue on musculoskeletal biomechanics and tibial bone strain during athletic movements remains unclear. In this study, participant-specific finite element (FE) and musculoskeletal models in 10 collegiate-basketball players were used to analyze the effect of acute performance fatigue on joint kinematics and torques, ground reaction forces (GRFs), and the magnitude and distribution of tibial bone strains during select basketball maneuvers. Participants were fatigued by performing repeated exercises wearing a weighted vest until their vertical jump height decreased by 20 %. Fatigue reduced the vertical GRF during midstance of a jump task, and lowered hip and knee peak extension torques and ankle plantarflexion. However, fatigue had limited impact on tibial bone strain magnitude and distribution during jumping. In contrast, there was a shift in peak strain timing following fatigue during a lateral cut task and reduced strain at various times of stance during sprinting. The results suggest that fatigue was induced and, if anything, reduced tibial bone strain. As increased bone strain is thought to be associated with increased BSI risk, the reduced strain observed in the current study suggests that fatigue may actually be partly protective, possibly as a result of reduced muscle activation and force production.
胫骨是活跃人群中骨应力损伤（BSI）最常见的部位之一。BSI被认为是由于在组织屈服极限以下的反复加载导致损伤积累而发生的。疲劳对运动过程中肌肉骨骼生物力学和胫骨骨应变的影响仍不清楚。在本研究中，使用10名大学篮球运动员的特定参与者有限元（FE）和肌肉骨骼模型，分析急性运动疲劳对特定篮球动作期间关节运动学和扭矩、地面反作用力（GRF）以及胫骨骨应变的大小和分布的影响。参与者穿着加重背心进行重复练习直至垂直跳高度下降20%，从而产生疲劳。疲劳降低了跳跃任务支撑中期的垂直GRF，并降低了髋关节和膝关节的峰值伸展扭矩以及踝关节跖屈。然而，疲劳对跳跃过程中胫骨骨应变的大小和分布影响有限。相比之下，在横向切入任务中疲劳后峰值应变时间发生了变化，并且在短跑过程中不同站立时间的应变降低。结果表明疲劳被诱发了，而且如果有影响的话，是降低了胫骨骨应变。由于骨应变增加被认为与BSI风险增加有关，本研究中观察到的应变降低表明疲劳实际上可能具有一定的保护作用，这可能是由于肌肉激活和力量产生减少所致。
