Acquisition of mechanical energy directly contributing to sideward propulsion in sidestep cutting manoeuvre
Acquisition of mechanical energy directly contributing to sideward propulsion in sidestep cutting manoeuvre
复制标题
获得机械能直接有助于侧向切削机动中的侧向推进
DOI：
10.1016/j.jbiomech.2021.110799
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发表时间：
2021
影响因子：
2.4
通讯作者：
Fukashiro S
中科院分区：
文献类型：
--
作者：
Sado N,Yoshioka S;Fukashiro S
人类很少执行稳态向前运动，并且经常通过非向前推进来改变机车方向。这种机动性是必不可少的人类，然而，不稳定运动力学的理解比稳态运动，因为在不稳定运动的研究具有广泛的变化范围的困难。在这里，我们展示了身体侧向推进机制，在一个侧步切割机动。本文分析了10名男子在90°侧步最大用力切割站立阶段的运动和地面反作用力，并确定了内外侧运动能（E M L）、前后运动能（E A P）和超重力运动能加重力势能（E S I）变化的节段分量。内侧速度和E M L从站姿开始到结束逐渐增加。站立-小腿旋转增加了E M L，降低了E A P（站立早期：0.54±0.17和− 1.49±0.59 J/kg，站立晚期：0.25±0.14和− 0.40±0.17 J/kg），即使膝关节和踝关节的工作从小腿流出能量。小腿旋转引起站立早期EM L总增加的一半以上（58±7%）。站立-大腿旋转增加了E M L，降低了E A P（站立早期：0.28±0.12和− 0.26±0.15 J/kg，站立晚期：1.43±0.26和− 0.47±0.13 J/kg）。我们增加了转换从E A P到E M L的小腿和大腿旋转在横向平面的侧向推进机制，类似于从E A P到E S I在运行单腿跳跃在以前的研究。再加上以前的研究，我们证明了具有不同目标方向的非向前运动模式之间的推进机制的共性，这在不稳定运动模式之间架起了知识的桥梁。
Humans seldom perform steady-state forward locomotion and often change locomotive direction through non-forward propulsion. Such manoeuvrability is essential for humans; however, unsteady-locomotion mechanics are understood less than steady-state locomotion because of the difficulty in research on unsteady locomotion with a wide range of variations. Here we show the body sideward propulsion mechanism in a sidestep cutting manoeuvre. We analysed the motion and ground reaction force of 10 males during the stance phase in 90° sidestep cutting with maximal efforts and determined the segmental components to the changes in the mediolateral-kinetic (E M L), anteroposterior-kinetic (E A P), and superoinferior-kinetic plus gravitational-potential energies (E S I). The medial velocity and E M L increased from the beginning to the end of the stance. The stance-leg shank rotation increased E M L and decreased E A P (early stance: 0.54±0.17 and− 1.49±0.59 J/kg, late stance: 0.25±0.14 and− 0.40±0.17 J/kg), even while the knee and ankle work outflowed energy from the shank. The shank rotation induced over half the total increase in E M L during the early stance (58±7%). The stance-leg thigh rotation increased E M L and decreased E A P (early stance: 0.28±0.12 and− 0.26±0.15 J/kg, late stance: 1.43±0.26 and− 0.47±0.13 J/kg). We added the transformation from E A P to E M L by the shank and thigh rotations in the transverse plane to the sideward propulsion mechanisms, similar to the transformation from E A P into E S I in running single-leg jumps in a previous study. Coupled with previous studies, we prove the commonality in propulsion mechanisms across non-forward locomotion modes with different objective directions, which bridges the knowledge between unsteady locomotion modes.