Department of Pain, The Second Hospital of Jilin University, Changchun, Jilin, China (mainland).
Department of Endocrinology, Shanghai National Research Center for Endocrine and Metabolic Disease, State Key Laboratory of Medical Genomics, Shanghai Institute for Endocrine and Metabolic Disease, Ruijin Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, China (mainland).
Med Sci Monit. 2021 Nov 26;27:e933204. doi: 10.12659/MSM.933204.
BACKGROUND This biomechanics study of the lower limbs aimed to compare the use of the International Society of Biomechanics Six-Degrees-of-Freedom (ISB-6DOF) model and the conventional gait model (CGM), formerly known as the Helen Hayes model, in 20 male sprinters who habitually used the forefoot (FF) or rearfoot (RF) strike modes. MATERIAL AND METHODS We used a motion capture system to compare the difference in lower-extremity joint mechanics between sprinters' forefoot or rearfoot strike mode during unplanned sidestepping (UPSS). Twenty elite sprinters participated in a motion capture test under 2 models. Each of the 10 participants were classified as having a habitual forefoot strike mode or rearfoot strike mode during unplanned sidestepping. Joint mechanics and gait parameters were calculated according to the designed movement. RESULTS Comparison of the 2 models showed that the knee joint angles were inconsistent (P<0.05), highlighting the difficulty of the Helen Hayes model in anatomical recognition. The results of the 2 models show that during the unplanned sidestepping, the sprinter using the habitual rearfoot strike mode had a greater load through the knee joint (P<0.05). Sprinters who used the habitual forefoot strike mode experienced greater load through their ankle joints (P<0.05). CONCLUSIONS The findings from this biomechanics study showed that when compared with the ISB-6DoF model, the findings from the CGM were more reproducible for the evaluation of FF and RF strike during unplanned sidestepping.
本下肢生物力学研究旨在比较国际运动生物力学学会六自由度（ISB-6DOF）模型和传统步态模型（CGM）在 20 名惯用前足（FF）或后足（RF）着地模式的短跑运动员中的应用。
我们使用运动捕捉系统比较了在计划外横向移动（UPSS）期间，短跑运动员前足或后足着地模式下下肢关节力学的差异。20 名精英短跑运动员在 2 种模型下进行了运动捕捉测试。根据设计的运动，计算了关节力学和步态参数。
2 种模型的比较表明，膝关节角度不一致（P<0.05），凸显了海伦·海斯模型在解剖学识别方面的困难。2 种模型的结果表明，在计划外横向移动时，惯用后足着地模式的短跑运动员膝关节受力更大（P<0.05）。惯用前足着地模式的短跑运动员踝关节受力更大（P<0.05）。
本生物力学研究结果表明，与 ISB-6DoF 模型相比，CGM 对于评价计划外横向移动时 FF 和 RF 着地的重复性更好。
