Kazemi Hamed, Kearney Robert E, Milner Theodore E
Annu Int Conf IEEE Eng Med Biol Soc. 2014;2014:4386-90. doi: 10.1109/EMBC.2014.6944596.
The goal of this study was to investigate the effect of speed on patterns of grip forces during twisting movement involving forearm supination against a torsional load (combined elastic and inertial load). For slow and moderate speed rotations, the grip force increased linearly with load torque. However, for fast rotations in which the contribution of the inertia to load torque was significantly greater than slower movements, the grip force-load torque relationship could be segmented into two phases: a linear ascending phase corresponding to the acceleration part of the movement followed by a plateau during deceleration. That is, during the acceleration phase, the grip force accurately tracked the combined elastic and inertial load. However, the coupling between grip force and load torque was not consistent during the deceleration phase of the movement. In addition, as speed increased, both the position and the force profiles became smoother. No differences in the baseline grip force, safety margin to secure the grasp during hold phase or the overall change in grip force were observed across different speeds.
本研究的目的是调查速度对涉及前臂旋前以抵抗扭转载荷（弹性和惯性载荷组合）的扭转运动过程中握力模式的影响。对于慢速和中速旋转，握力随负载扭矩呈线性增加。然而，对于快速旋转，其中惯性对负载扭矩的贡献明显大于较慢运动时，握力-负载扭矩关系可分为两个阶段：一个线性上升阶段对应于运动的加速部分，随后是减速阶段的平稳期。也就是说，在加速阶段，握力精确跟踪弹性和惯性载荷的组合。然而，在运动的减速阶段，握力和负载扭矩之间的耦合并不一致。此外，随着速度增加，位置和力分布都变得更平滑。在不同速度下，未观察到基线握力、保持阶段确保抓握的安全裕度或握力的总体变化存在差异。
